[go: up one dir, main page]

US20100183753A1 - Nematode control agent - Google Patents

Nematode control agent Download PDF

Info

Publication number
US20100183753A1
US20100183753A1 US12/663,903 US66390308A US2010183753A1 US 20100183753 A1 US20100183753 A1 US 20100183753A1 US 66390308 A US66390308 A US 66390308A US 2010183753 A1 US2010183753 A1 US 2010183753A1
Authority
US
United States
Prior art keywords
pcn
soil
gasa
treatments
granules
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US12/663,903
Inventor
Gidon BAHIRI
Lan ELLIOTT
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
OMEX INTERNATIONAL Ltd
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of US20100183753A1 publication Critical patent/US20100183753A1/en
Assigned to OMEX INTERNATIONAL LTD reassignment OMEX INTERNATIONAL LTD ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BAHIRI, GIDON, MR, ELLIOTT, IAN, MR
Abandoned legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N65/00—Biocides, pest repellants or attractants, or plant growth regulators containing material from algae, lichens, bryophyta, multi-cellular fungi or plants, or extracts thereof
    • A01N65/40—Liliopsida [monocotyledons]
    • A01N65/42—Aloeaceae [Aloe family] or Liliaceae [Lily family], e.g. aloe, veratrum, onion, garlic or chives
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N35/00—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom having two bonds to hetero atoms with at the most one bond to halogen, e.g. aldehyde radical
    • A01N35/04—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom having two bonds to hetero atoms with at the most one bond to halogen, e.g. aldehyde radical containing aldehyde or keto groups, or thio analogues thereof, directly attached to an aromatic ring system, e.g. acetophenone; Derivatives thereof, e.g. acetals

Definitions

  • the present invention is in the field of agricultural pest control agents. More specifically the invention relates to such agents of biological source in their use as nematode control agents.
  • Salicylaldehyde is a naturally occurring substance. In some plants and plant parts its concentration is considerable. It has been shown by Pasteels J M and J C Gregoire, 1983 (The chemical ecology of defense in Arthropods, Ann Rev Entomol 28:263-289) that larvae of the chrysomelid tribe Phaedomini secret salicylaldehyde.
  • the salicylaldehyde is used as a natural repellent by the feeding beetle against small predators such as ants.
  • the salicylaldehyde is produced by the larvae from salicin, a glucoside, which is extracted by the larvae from the host plant, and further used to produce salicylaldehyde by the feeding beetle.
  • GASA granules Such granules are referred to hereinafter as GASA granules. Terpene, and Tyratech granules were also used in the experiments. All these materials were supplied by Omex Agriculture, of Bardney Airfield, Tupholme, Lincoln LN3 5TP, UK. In addition Vydate (oxamyl) granules were used as a standard nematicide treatment.
  • PCN Potato Cyst Nematodes
  • PCN G. rostochiensis
  • SASA Scottish Agricultural Science Agency
  • a sample of 5 cysts from the batch of cysts supplied by SASA was evaluated for viability and numbers of eggs/cyst. A mean count of 102.2 ⁇ 8.18 eggs/cyst was found.
  • PCN cysts were extracted from soil by drying the soil, crushing lightly with a roller, and then washing through sieves to collect the cysts through filtration. A sub-sample of the total cysts collected were split open to measure viability and to count the numbers of eggs or juvenile nematodes present, expressed as number of eggs/g of soil.
  • Soil used in the tests was obtained from a field at the Bush Estate which is routinely used for growing cereals. No potatoes have been grown in the field in living memory. Soil analysis indicated no PCN present in the soil, and very low numbers of free living nematodes. Soil was partially dried and crushed to ensure a fine-medium consistency for use in all of the pot tests.
  • GASA liquid Analysis of variance, P ⁇ 0.005
  • Terpene P ⁇ 0.05
  • GE P ⁇ 0.05
  • Tyratech granules P ⁇ 0.05
  • the GASA liquid treatment also had significantly fewer eggs/g of soil than the Vydate and SAM treatments (P ⁇ 0.05). After 3 months exposure, all treatments had significantly fewer eggs/g of soil than the Control and Vydate treatments (P ⁇ 0.01).
  • the GASA liquid treatment had significantly fewer eggs/g of soil than the Terpene (P ⁇ 0.05), GE (P ⁇ 0.005), GASA granules (P ⁇ 0.05), Tyratech granules (P ⁇ 0.001) and SAM (P ⁇ 0.001) treatments.
  • the GASA granules treatment had significantly fewer eggs/g of soil than the Tyratech granules (P ⁇ 0.05) and SAM (P ⁇ 0.01) treatments.
  • the Terpene treatment had fewer eggs/g of soil than the SAM treatment (P ⁇ 0.05). The decline in eggs/g of soil can be put down to a reduction in the viability of the PCN cysts over time and in response to the different treatments (see Table 1 below).
  • GASA liquid P ⁇ 0.001
  • GASA granules P ⁇ 0.005
  • Terpene P ⁇ 0.001
  • GE P ⁇ 0.001
  • Tyratech P ⁇ 0.001
  • SAM SAM
  • the Vydate treatment also had fewer viable cysts than the control treatment (P ⁇ 0.01).
  • the GASA liquid treatment had significantly fewer viable cysts than the Vydate (P ⁇ 0.001), Terpene (P ⁇ 0.05), GASA granules (P ⁇ 0.05), Tyratech (P ⁇ 0.05) and SAM (P ⁇ 0.05) treatments after 2 months exposure.
  • the GE treatment had significantly fewer viable cysts than the Vydate treatment after 2 months exposure (P ⁇ 0.05). After 3 months, all treatments had a significant decrease in cyst viability compared to the control and Vydate treatments (P ⁇ 0.001, Table 1).
  • the GASA liquid treatment had significantly fewer viable cysts than the Tyratech (P ⁇ 0.05) and SAM (P ⁇ 0.05) treatments.
  • the GE treatment and GASA granules treatment had significantly fewer viable cysts than the SAM treatment (P ⁇ 0.05).
  • Vydate oxamyl
  • nematistat i.e. the chemical paralyses the nematodes rather than killing them, and needs the nematodes to be liberated from the cysts in order to be effective.
  • the other treatments applied to the soil appear to be able to have an impact on the nematodes within the cyst, suggesting that they are able to pass through the cyst wall or weaken the cyst to some extent.
  • the GASA liquid and GASA granule treatments were the most effective at reducing PCN cyst viability. This was reflected in the numbers of eggs/g of soil for these treatments.
  • PCN Potato Cyst Nematodes
  • Treatments and agents control with PCN cysts (10 replicates), control with no PCN cysts (10 replicates); GASA liquid at 2.5 ml/kg soil with PCN (as 2.5 kg of soil was used, 6.25 ml of the treatment was mixed with the soil to get the equivalent rate) (8 replicates); GASA liquid drench 5 days after planting at 2.5 ml/kg soil with PCN (since 2.5 kg of soil was used, a 6.25 ml portion was mixed in 100 ml of water and irrigated evenly over the soil surface to get the equivalent rate) (7 replicates); GE at 2.5 ml/kg soil with PCN (8 replicates).
  • Plant height was recorded 20, 35, 45 and 60 days after planting.
  • the potatoes were grown for 120 days to allow the life cycle of the PCN to be completed. No fungicides, herbicides, insecticides or fertiliser was applied to the potatoes. On day 117, the haulm of the potatoes was cut back. The pots were emptied onto white trays and the tubers produced by the roots were counted, removed, and washed to remove any soil before weighing. For each pot any tubers less than 2 cm in diameter were removed and not counted. After the potatoes had been removed, the soil from each pot was placed onto trays and dried. A sub-sample of 500 g of the soil from each pot was assessed for PCN egg counts.
  • Plant height After 20 days, there are already significant differences between several treatments. All treatments were significantly taller than the control with PCN plants (Analysis of Variance, P ⁇ 0.05). The GASA granules, GASA liquid and GE treated pots were significantly taller than the control without PCN (P ⁇ 0.05). All of the experimental treatments were also significantly taller than the Vydate nematicide treatment (P ⁇ 0.05). This may be indicative of a growth stimulation or fertiliser effect as PCN cyst hatch would be in its infancy at this stage. After 35 days, the plant height differences between the treatments are not so apparent, although all treatments have significantly taller plants than the control with PCN plants (P ⁇ 0.01).
  • Number of tubers The number of tubers harvested after 120 days from all treatments is summarised in Table 2. Note that further tubers may well have been produced had the plants been grown for longer and in larger pots. The growth period of 120 days was chosen for the completion of the life cycle of PCN. There was great deal of variability within and between treatments in the number of tubers after 120 days (Table 2). The only significant difference in tuber number was between the control with PCN and the control with no PCN treatments (P ⁇ 0.05), and the control with PCN and Vydate treatments (P ⁇ 0.05).
  • Tuber yields Mean tuber yields (total weight of all tubers) ranged from 83 g in the control with PCN pots to 110 g in the Vydate pots (Table 2). The following treatments has significantly greater yields than the Control with PCN pots: Vydate (P ⁇ 0.001), control with no PCN (P ⁇ 0.001), GASA liquid (P ⁇ 0.05) and SAM post planting drench (P ⁇ 0.05).
  • Vydate treatment having higher yields than some of the other treatments suggests that the nematodes are still able to feed and consequently reduce yields in those treatments, whilst the nematistatic action of Vydate paraylyses the majority of the nematodes resulting in higher yields.
  • PCN multiplication during the growing of the crop The plants were grown for 120 days so that the life cycle of PCN on the roots of the potatoes could be completed—i.e new cysts formed.
  • the mean number of PCN eggs/g soil extracted after harvest (P f ) is shown in Table 3.
  • PCN multiplication in the Vydate, GASA granules and GASA liquid post planting drench treatments was approximately a third of that in the Control with PCN treatment (Table 3).
  • the other treatments reduced PCN multiplication by approximately half compared to the Controll with PCN treatment (Table 3).
  • the standard measure of PCN multiplication is the ratio of the final PCN population after harvest (P f ) to the initial PCN population at planting (P i ).
  • the mean P f /P i ratios are shown in Table 3.
  • the mean P f /P i ratios of all treatments were significantly lower than that of the Control with PCN treatment (P ⁇ 0.001).
  • the following treatments had a significantly lower P f /P i ratio than the Vydate treatment: Control with PCN (P ⁇ 0.001), GASA liquid post planting drench (P ⁇ 0.05), GE (P ⁇ 0.05), GE post planting drench (P ⁇ 0.001), Tyratech granules (P ⁇ 0.001), SAM (P ⁇ 0.001), and SAM post planting drench (P ⁇ 0.001).
  • the following treatments had a significantly lower P f /P i ratio than the GASA liquid treatment: Control with PCN (P ⁇ 0.001), GASA liquid post planting drench (P ⁇ 0.001), GE (P ⁇ 0.005), GE post planting drench (P ⁇ 0.001), Tyratech granules (P ⁇ 0.001), SAM (P ⁇ 0.001), and SAM post planting drench (P ⁇ 0.001).
  • the GASA liquid post planting drench had a significantly lower P f /P i ratio than the SAM post planting drench treatment (P ⁇ 0.005).
  • the treatments stimulate plant growth to some extent, possibly due to nutrients present which act as a fertiliser enhance growth.
  • Admixing treatments at planting with the soil was more effective at stimulating plant growth than a soil drench 5 days after planting. Tuber numbers are higher in the Vydate treatment, probably as a consequence of the Vydate being able to prevent the nematodes feeding due its nematistatic action. Tuber yields in the GASA liquid, GASA granules and GE post planting drench are comparable to that of Vydate.
  • Vydate, GASA liquid and GASA granules have the most significant impact on PCN multiplication during the growing of the crop, suggesting that the GASA treatments have an impact on nematodes after they have hatched from cysts, either as a nematistat and/or by having a direct effect on nematode mortality.
  • the GASA liquid and GASA granule treatments can reduce the viability of PCN cysts over a 3 month period when admixed with soil infested with PCN. Up to a 75% reduction in viability was seen, compared to a natural decline in viability of 20% in Control pots. The mechanism for this activity is not readily apparent.
  • the chemicals in the GASA and other treatments may be able to pass through the cyst wall, may provide a food resource for naturally occurring bacteria and fungi in the soil to increase their populations and have an effect on the integrity of the cysts, may have a fumigant effect in the soil through when being broken down.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Zoology (AREA)
  • Agronomy & Crop Science (AREA)
  • Plant Pathology (AREA)
  • Dentistry (AREA)
  • Wood Science & Technology (AREA)
  • Environmental Sciences (AREA)
  • Natural Medicines & Medicinal Plants (AREA)
  • Biotechnology (AREA)
  • Microbiology (AREA)
  • Mycology (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Catching Or Destruction (AREA)

Abstract

A composition for the control of nematodes consisting of salicylaldehyde and a surfactant. Garlic extract added to the salicylaldehyde provides a composition that demonstrates a more potent control action against potato cyst nematodes.

Description

    FIELD OF THE INVENTION
  • The present invention is in the field of agricultural pest control agents. More specifically the invention relates to such agents of biological source in their use as nematode control agents.
    • BACKGROUND OF THE INVENTION
  • Salicylaldehyde (SA) is a naturally occurring substance. In some plants and plant parts its concentration is considerable. It has been shown by Pasteels J M and J C Gregoire, 1983 (The chemical ecology of defense in Arthropods, Ann Rev Entomol 28:263-289) that larvae of the chrysomelid tribe Phaedomini secret salicylaldehyde. The salicylaldehyde is used as a natural repellent by the feeding beetle against small predators such as ants. The salicylaldehyde is produced by the larvae from salicin, a glucoside, which is extracted by the larvae from the host plant, and further used to produce salicylaldehyde by the feeding beetle.
  • In a previous invention by one of the co-inventors of the present inention, disclosed in PCT publication WO 2005/102024, the use of salicylaldehyde (SA) either alone or in combination with garlic extract, as control agent for diverse groups of pests was studied. In the present invention, sharing an inventor with the above cited invention, the potential use of SA as a nematode control agent was demonstrated.
    • DETAILED DESCRIPTION OF THE PRESENT INVENTION
  • Tests were performed by The Scottish Agricultural College (SAC) in Scotland, during the year 2006. Materials used in the tests were as follows: salicyladehyde mixed with the alcohol ethoxylate surfactant Symperonic 91-8, at 1:1 ratio, this mixture is referred to hereinafter as SAM. The surfactant was implemented in this case as a dispersant. Further agents used were garlic extract (GE), and GE mixed with SAM, at the ratio of 4:1. Such a mixture is hereinafter referred to as GASA (liquid). GASA was prepared also in the form of granules made by spraying the GASA on clay, as known in the art, the product contained about 5 liters of GASA for every 20 Kg final product (solid granules). Such granules are referred to hereinafter as GASA granules. Terpene, and Tyratech granules were also used in the experiments. All these materials were supplied by Omex Agriculture, of Bardney Airfield, Tupholme, Lincoln LN3 5TP, UK. In addition Vydate (oxamyl) granules were used as a standard nematicide treatment.
  • Experiment 1: Control of Potato Cyst Nematodes (PCN) (Globodera rostochiensis) in the Absence of Potato Tubers.
  • These tests were carried to specifically measure the effect of soil treatments on the survival and viability of PCN cysts in the soil in the absence of any potato plants. All tests were carried out in glasshouses at SAC in Edinburgh. The plant pots with potatoes were initially kept outdoors for 1 month before moving indoors.
  • The pest: PCN (G. rostochiensis) cysts were obtained from the Scottish Agricultural Science Agency (SASA). They were obtained from their statutory sampling of fields for seed potato production in 2006. A sample of 5 cysts from the batch of cysts supplied by SASA was evaluated for viability and numbers of eggs/cyst. A mean count of 102.2±8.18 eggs/cyst was found. After the experiments, PCN cysts were extracted from soil by drying the soil, crushing lightly with a roller, and then washing through sieves to collect the cysts through filtration. A sub-sample of the total cysts collected were split open to measure viability and to count the numbers of eggs or juvenile nematodes present, expressed as number of eggs/g of soil.
  • Soil: Soil used in the tests was obtained from a field at the Bush Estate which is routinely used for growing cereals. No potatoes have been grown in the field in living memory. Soil analysis indicated no PCN present in the soil, and very low numbers of free living nematodes. Soil was partially dried and crushed to ensure a fine-medium consistency for use in all of the pot tests.
  • Methodology: From the batch of PCN cysts obtained from SASA, 50 cysts were counted out and mixed with 250 g of soil for each replicate. The treatments were mixed with the 250 g of soil and 50 cysts and placed into small plastic pots. This gave an estimated baseline figure of 102.2/250×50=20.44 PCN eggs/g soil. The pots (15 per treatment) were watered every few days to keep moist but not saturated and were kept in a glasshouse at around 18° C. After, approx 1 month (end of September), 2 months (end of October) and 3 months (end of November) all the soil from 5 pots from each treatment were extracted for PCN cysts. The viability of the cysts was assessed—i.e. how many cysts had live PCN eggs/larvae in them, and the mean No. of viable eggs/cyst was determined. This was then converted to the Mean No. of PCN eggs/g soil. The treatments and doses were as outlined below. As dose rates were supplied as ml/litre, they were converted to ml/kg assuming 1 kg of soil is equivalent to 1 litre.
  • Treatments: Control, GASA liquid at 2.5 ml/kg soil (as 250 g of soil used, 0.625 ml of the agent was mixed with the soil to get the equivalent rate).
  • Terpene liquid at 2.5 ml/kg soil, GE at 2.5 ml/kg soil, GASA granules at 2.5 g/kg soil, Tyratech granules at 2.5 g/kg soil, SAM liquid at 1 ml/kg soil; Vydate (oxamyl) rate equivalent to 55 kg/ha. Each pot was 5 cm×5 cm=25 cm2. i.e. 0.25 m2. Vydate rate is equivalent to 5.5 g/m2. So rate for each pot is 1/20th of 5.5 g/m2=0.275 g/pot
  • Results: There was a decline in mean No. of eggs/g of soil over time in all treatments. This is to be expected as cysts will spontaneously hatch in the absence of potatoes (between 15-40% is usual), so it is the rate of decline that is important in these results. The Control pots have declined the least, going from 20.44 eggs/g at Time 0, to 18.67 eggs/g after one month, 17.86 eggs/g after two months and 16.47 eggs/g after 3 months. The GASA liquid treatment has caused the greatest decline in PCN eggs after 3 months, going from 20.44 eggs/g at Time 0, to 17.29 eggs/g after one month, 11.003 eggs/g after two months, and 5.14 eggs/g after 3 months. Differences in eggs/g of soil do not become apparent until 2 months exposure, when the following treatments have significantly fewer eggs/g of soil than the Control: GASA liquid (Analysis of variance, P<0.005), Terpene (P<0.05), GE (P<0.05) and Tyratech granules (P<0.05). The GASA liquid treatment also had significantly fewer eggs/g of soil than the Vydate and SAM treatments (P<0.05). After 3 months exposure, all treatments had significantly fewer eggs/g of soil than the Control and Vydate treatments (P<0.01). The GASA liquid treatment had significantly fewer eggs/g of soil than the Terpene (P<0.05), GE (P<0.005), GASA granules (P<0.05), Tyratech granules (P<0.001) and SAM (P<0.001) treatments. The GASA granules treatment had significantly fewer eggs/g of soil than the Tyratech granules (P<0.05) and SAM (P<0.01) treatments. The Terpene treatment had fewer eggs/g of soil than the SAM treatment (P<0.05). The decline in eggs/g of soil can be put down to a reduction in the viability of the PCN cysts over time and in response to the different treatments (see Table 1 below).
  • TABLE 1
    Mean % of viable PCN cysts after exposure
    to various soil treatments
    Mean % of viable PCN cysts (±SE) after:
    Treatment 1 month 2 months 3 months
    Control 91.36 ± 2.61 87.38 ± 0.75 80.58 ± 2.78
    GASA liquid 80.46 ± 1.71 53.83 ± 1.79 25.12 ± 6.79
    Terpene 81.76 ± 3.72 65.40 ± 4.36 37.00 ± 7.14
    GE 85.84 ± 4.64 62.12 ± 4.05 41.36 ± 3.01
    GASA granules 85.58 ± 2.93 67.45 ± 4.92 34.30 ± 6.96
    Tyratech granules 87.31 ± 3.59 66.13 ± 4.31 46.55 ± 3.50
    SAM 84.10 ± 5.93 71.68 ± 5.51 52.32 ± 3.06
    Vydate 86.96 ± 1.96 75.86 ± 3.05 84.38 ± 3.42
  • Only a quarter of the PCN cysts in the GASA liquid treatment were viable (i.e. contained live PCN eggs or juveniles) after 3 months exposure. The Control treatment still had 80% viable cysts after 3 months, as did the Vydate (oxamyl) standard nematicide treatment. All the other treatments did have an affect on PCN cyst viability to some extent, with the GASA Granules and the Terpene treatments reducing cyst viability to below 40%. Significant differences in PCN cyst viability became apparent between the GASA granules and Control treatments after 1 month (P<0.01), but it was not until the cysts had been exposed to the treatments for 2 months did differences in cyst viability between the Control and other treatments become significant (Table 1). All treatments had a significant decrease in cyst viability compared to the control after 2 months exposure: GASA liquid (P<0.001), GASA granules (P<0.005), Terpene (P<0.001), GE (P<0.001), Tyratech granules (P<0.001) and SAM (P<0.05). The Vydate treatment also had fewer viable cysts than the control treatment (P<0.01). The GASA liquid treatment had significantly fewer viable cysts than the Vydate (P<0.001), Terpene (P<0.05), GASA granules (P<0.05), Tyratech (P<0.05) and SAM (P<0.05) treatments after 2 months exposure. The GE treatment had significantly fewer viable cysts than the Vydate treatment after 2 months exposure (P<0.05). After 3 months, all treatments had a significant decrease in cyst viability compared to the control and Vydate treatments (P<0.001, Table 1). The GASA liquid treatment had significantly fewer viable cysts than the Tyratech (P<0.05) and SAM (P<0.05) treatments. The GE treatment and GASA granules treatment had significantly fewer viable cysts than the SAM treatment (P<0.05).
  • Summary: All treatments except Vydate reduced cyst viability to some extent compared to the Controll. Vydate (oxamyl) is a nematistat: i.e. the chemical paralyses the nematodes rather than killing them, and needs the nematodes to be liberated from the cysts in order to be effective. The other treatments applied to the soil appear to be able to have an impact on the nematodes within the cyst, suggesting that they are able to pass through the cyst wall or weaken the cyst to some extent. The GASA liquid and GASA granule treatments were the most effective at reducing PCN cyst viability. This was reflected in the numbers of eggs/g of soil for these treatments.
  • Experiment 2: Control of Potato Cyst Nematodes (PCN) (Globodera rostochiensis) in Soil with Potato Tubers.
  • Methodology: from the batch of PCN cysts obtained from SASA, 500 cysts were counted out and mixed with 2.5 kg of soil for each replicate. This gave the same PCN eggs/g count as in Experiment 1—20.44 eggs/g soil, which would be expected to cause a significant effect on yield if untreated. The treatments were mixed with the 2.5 kg of soil and 500 cysts and placed into large plastic pots. One seed tuber of the potato cultivar Cara was planted to a depth of 5 cm in each pot. For the liquid formulation treatments they were also applied as a soil drench 5 days post-planting. The pots were irrigated every few days to keep moist but not saturated and were initially kept outdoors for a month before moving into a glasshouse at around 18° C. The agents and doses were as outlined below. As dose rates were supplied as ml/litre, they were converted to ml/kg assuming 1 kg of soil is equivalent to 1 litre.
  • Treatments and agents: control with PCN cysts (10 replicates), control with no PCN cysts (10 replicates); GASA liquid at 2.5 ml/kg soil with PCN (as 2.5 kg of soil was used, 6.25 ml of the treatment was mixed with the soil to get the equivalent rate) (8 replicates); GASA liquid drench 5 days after planting at 2.5 ml/kg soil with PCN (since 2.5 kg of soil was used, a 6.25 ml portion was mixed in 100 ml of water and irrigated evenly over the soil surface to get the equivalent rate) (7 replicates); GE at 2.5 ml/kg soil with PCN (8 replicates). GE drench 5 days after planting at 2.5 ml/kg soil with PCN (7 replicates); GASA granules at 2.5 g/kg soil with PCN (10 replicates); Tyratech granules at 2.5 g/kg soil with PCN (10 replicates); SAM liquid at 1 ml/kg soil with PCN (7 replicates); SAM liquid drench 5 days after planting at 1 ml/kg soil with PCN (8 replicates); Vydate (oxamyl) rate equivalent to 55 kg/ha (2.75 g/pot) with PCN (10 replicates).
  • Plant height was recorded 20, 35, 45 and 60 days after planting. The potatoes were grown for 120 days to allow the life cycle of the PCN to be completed. No fungicides, herbicides, insecticides or fertiliser was applied to the potatoes. On day 117, the haulm of the potatoes was cut back. The pots were emptied onto white trays and the tubers produced by the roots were counted, removed, and washed to remove any soil before weighing. For each pot any tubers less than 2 cm in diameter were removed and not counted. After the potatoes had been removed, the soil from each pot was placed onto trays and dried. A sub-sample of 500 g of the soil from each pot was assessed for PCN egg counts. As the initial PCN eggs/g count was known at planting (Pi=20.44 eggs/g), the PCN eggs/g after harvest (Pf) was determined for each pot. The ratio of Pf/Pi gives a measure of the rate of PCN multiplication for each pot.
  • Results: For several of the treatments (GASA liquid, GASA Granules, SAM, GE and Tyratech granules) there was transient yellowing of the foliage. The leaves eventually regained full green colour after 60 days. Most of the plants remained free of potato blight, although there were some occasional leaves affected towards the end of the trial.
  • Plant height: After 20 days, there are already significant differences between several treatments. All treatments were significantly taller than the control with PCN plants (Analysis of Variance, P<0.05). The GASA granules, GASA liquid and GE treated pots were significantly taller than the control without PCN (P<0.05). All of the experimental treatments were also significantly taller than the Vydate nematicide treatment (P<0.05). This may be indicative of a growth stimulation or fertiliser effect as PCN cyst hatch would be in its infancy at this stage. After 35 days, the plant height differences between the treatments are not so apparent, although all treatments have significantly taller plants than the control with PCN plants (P<0.01). Other differences in plant height are those between the GASA liquid and GASA liquid post planting drench (P<0.001) and the GE and GE post planting drench (P<0.05). After 45 days and 60 days, the only differences in plant height are those between all treatments and the Control with PCN (P<0.001), and the GASA liquid and GASA liquid post planting drench (P<0.01). The cumulative progress in plant height over time for all treatments shows that the GASA liquid, GASA granules and GE treatments have the most rapid rates of growth over the first 60 days.
  • Number of tubers: The number of tubers harvested after 120 days from all treatments is summarised in Table 2. Note that further tubers may well have been produced had the plants been grown for longer and in larger pots. The growth period of 120 days was chosen for the completion of the life cycle of PCN. There was great deal of variability within and between treatments in the number of tubers after 120 days (Table 2). The only significant difference in tuber number was between the control with PCN and the control with no PCN treatments (P<0.05), and the control with PCN and Vydate treatments (P<0.05).
  • Tuber yields: Mean tuber yields (total weight of all tubers) ranged from 83 g in the control with PCN pots to 110 g in the Vydate pots (Table 2). The following treatments has significantly greater yields than the Control with PCN pots: Vydate (P<0.001), control with no PCN (P<0.001), GASA liquid (P<0.05) and SAM post planting drench (P<0.05). The following treatments had a significantly less yield than the Vydate treatment: Control with PCN (P<0.001), GASA granules (P<0.05), GASA liquid post planting drench (P<0.05), GE (P<0.01), GE post planting drench (P<0.05), Tyratech granules (P<0.01) and SAM (P<0.05). In comparison with the control with no PCN yields, only GE and Tyratech granules had significantly reduced yields (P<0.05). The Vydate treatment having higher yields than some of the other treatments suggests that the nematodes are still able to feed and consequently reduce yields in those treatments, whilst the nematistatic action of Vydate paraylyses the majority of the nematodes resulting in higher yields.
  • TABLE 2
    Mean number of potato tubers/pot and Mean yield of tubers/pot
    Mean No. of Mean yield (total weight
    Treatment tubers/pot (±SE) of tubers)/pot (±SE)
    Control with PCN 5.70 ± 0.37 83.00 ± 3.65
    Control with no PCN 7.00 ± 0.42 104.70 ± 4.41 
    GASA Granules 6.30 ± 0.50  91.8 ± 5.27
    GASA Liquid 6.63 ± 0.60 98.13 ± 5.41
    GASA Liquid post drench 5.86 ± 0.51 92.00 ± 4.60
    GE 5.63 ± 0.50 88.25 ± 4.13
    GE post drench 5.71 ± 0.57 90.43 ± 6.34
    Tyratech Granules 5.90 ± 0.38 91.50 ± 3.64
    SAM 6.29 ± 0.42 92.00 ± 5.01
    SAM post drench 6.13 ± 0.44 97.38 ± 4.62
    Vydate 7.20 ± 0.39 110.50 ± 5.27 
  • PCN multiplication during the growing of the crop: The plants were grown for 120 days so that the life cycle of PCN on the roots of the potatoes could be completed—i.e new cysts formed. The mean number of PCN eggs/g soil extracted after harvest (Pf) is shown in Table 3. PCN multiplication in the Vydate, GASA granules and GASA liquid post planting drench treatments was approximately a third of that in the Control with PCN treatment (Table 3). The other treatments reduced PCN multiplication by approximately half compared to the Controll with PCN treatment (Table 3). The standard measure of PCN multiplication is the ratio of the final PCN population after harvest (Pf) to the initial PCN population at planting (Pi). The mean Pf/Pi ratios are shown in Table 3.
  • TABLE 3
    Mean No. of PCN eggs/g soil after harvest (Pf) and Mean rate of
    PCN multiplication (Pf/Pi) after harvest (Pi = 20.44 eggs/g)
    Mean No. of PCN Mean PCN
    eggs/g of soil (Pf) multiplication (Pf/Pi)
    Treatment after harvest (±SE) after harvest (±SE)
    Control with PCN  236.70 ± 17.80 11.58 ± 0.87 
    GASA Granules  76.00 ± 8.11 3.72 ± 0.40
    GASA Liquid  69.25 ± 6.04 3.39 ± 0.30
    GASA Liquid, post drench 113.57 ± 8.08 5.56 ± 0.40
    GE 105.75 ± 8.92 5.17 ± 0.44
    GE. post drench 126.86 ± 8.25 6.21 ± 0.40
    Tyratech Granules 131.50 ± 8.22 6.43 ± 0.40
    SAM  126.00 ± 10.40 6.16 ± 0.51
    SAM post drench 155.50 ± 7.03 7.61 ± 0.34
    Vydate  74.40 ± 6.83 3.64 ± 0.33
  • The mean Pf/Pi ratios of all treatments were significantly lower than that of the Control with PCN treatment (P<0.001). The following treatments had a significantly lower Pf/Pi ratio than the Vydate treatment: Control with PCN (P<0.001), GASA liquid post planting drench (P<0.05), GE (P<0.05), GE post planting drench (P<0.001), Tyratech granules (P<0.001), SAM (P<0.001), and SAM post planting drench (P<0.001). The following treatments had a significantly lower Pf/Pi ratio than the GASA granules treatment: Control with PCN (P<0.001), GASA liquid post planting drench (P<0.01), GE (P<0.05), GE post planting drench (P<0.001), Tyratech granules (P<0.001), SAM (P<0.005), and SAM post planting drench (P<0.001). The following treatments had a significantly lower Pf/Pi ratio than the GASA liquid treatment: Control with PCN (P<0.001), GASA liquid post planting drench (P<0.001), GE (P<0.005), GE post planting drench (P<0.001), Tyratech granules (P<0.001), SAM (P<0.001), and SAM post planting drench (P<0.001). The GASA liquid post planting drench had a significantly lower Pf/Pi ratio than the SAM post planting drench treatment (P<0.005).
  • Summary: The treatments (apart from Vydate) stimulate plant growth to some extent, possibly due to nutrients present which act as a fertiliser enhance growth. Admixing treatments at planting with the soil was more effective at stimulating plant growth than a soil drench 5 days after planting. Tuber numbers are higher in the Vydate treatment, probably as a consequence of the Vydate being able to prevent the nematodes feeding due its nematistatic action. Tuber yields in the GASA liquid, GASA granules and GE post planting drench are comparable to that of Vydate. Vydate, GASA liquid and GASA granules have the most significant impact on PCN multiplication during the growing of the crop, suggesting that the GASA treatments have an impact on nematodes after they have hatched from cysts, either as a nematistat and/or by having a direct effect on nematode mortality.
  • Overall Summary
  • The GASA liquid and GASA granule treatments can reduce the viability of PCN cysts over a 3 month period when admixed with soil infested with PCN. Up to a 75% reduction in viability was seen, compared to a natural decline in viability of 20% in Control pots. The mechanism for this activity is not readily apparent. The chemicals in the GASA and other treatments may be able to pass through the cyst wall, may provide a food resource for naturally occurring bacteria and fungi in the soil to increase their populations and have an effect on the integrity of the cysts, may have a fumigant effect in the soil through when being broken down.
  • In the presence of potatoes, the treatments stimulate plant growth which may lead to the increased yield seen in some of the treatments. PCN multiplication does occur on the roots of treated plants, but for the GASA liquid and granule treatments in particular, is comparable to that obtained by the industry standard nematicide Vydate.

Claims (10)

1. A composition for the control of nematodes comprising at least salicylaldehyde and a surfactant.
2. The composition as in claim 1, wherein the nematodes are potato cyst nematodes.
3. The composition as in claim 1, further comprising garlic extract.
4. The composition as in claim 1 wherein said surfactant is a dispersant.
5. The composition as in claim 3, wherein said composition is granulated.
6. (canceled)
7. A method for the control of soil nematodes comprising:
forming a mixture of salicylaldehyde and a surfactant; and
applying the mixture to soil infected with nematodes.
8. The method as in claim 7, further comprising adding garlic extract to said mixture prior to applying the mixture to the soil.
9. The method as in claim 7, wherein said nematodes are potato cyst nematodes.
10. A method for the control of soil nematodes comprising applying garlic extract to soil infected with said nematodes.
US12/663,903 2007-06-11 2008-06-11 Nematode control agent Abandoned US20100183753A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB0711065.3 2007-06-11
GB0711065A GB2450082B (en) 2007-06-11 2007-06-11 Nematode control agent
PCT/IB2008/052301 WO2008152589A2 (en) 2007-06-11 2008-06-11 Nematode control agent

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2008/052301 A-371-Of-International WO2008152589A2 (en) 2007-06-11 2008-06-11 Nematode control agent

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US14/017,775 Continuation US8808767B2 (en) 2007-06-11 2013-09-04 Nematode control agent

Publications (1)

Publication Number Publication Date
US20100183753A1 true US20100183753A1 (en) 2010-07-22

Family

ID=38319004

Family Applications (2)

Application Number Title Priority Date Filing Date
US12/663,903 Abandoned US20100183753A1 (en) 2007-06-11 2008-06-11 Nematode control agent
US14/017,775 Active US8808767B2 (en) 2007-06-11 2013-09-04 Nematode control agent

Family Applications After (1)

Application Number Title Priority Date Filing Date
US14/017,775 Active US8808767B2 (en) 2007-06-11 2013-09-04 Nematode control agent

Country Status (19)

Country Link
US (2) US20100183753A1 (en)
EP (1) EP2254408B1 (en)
CN (1) CN101938903B (en)
AR (1) AR070001A1 (en)
BR (1) BRPI0811322B1 (en)
CA (1) CA2720101C (en)
CL (1) CL2008001710A1 (en)
CY (1) CY1113728T1 (en)
DK (1) DK2254408T3 (en)
ES (1) ES2400745T3 (en)
GB (1) GB2450082B (en)
HR (1) HRP20130226T1 (en)
PE (1) PE20090821A1 (en)
PL (1) PL2254408T3 (en)
PT (1) PT2254408E (en)
SA (1) SA08290553B1 (en)
SI (1) SI2254408T1 (en)
UY (1) UY31142A1 (en)
WO (1) WO2008152589A2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2775834A4 (en) * 2011-11-03 2015-10-07 Yoram Tsivion Biologically active compositions containing phenolic residue

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103281905B (en) 2010-12-21 2016-10-19 拜尔作物科学有限合伙公司 The sand paper mutant of bacillus and for promoting plant growing, promoting plant health and control disease and the method for insect
PH12014500207B1 (en) 2011-07-25 2019-08-09 Bayer Cropscience Lp Biocontrol of nematodes
CN106281344B (en) * 2016-07-14 2021-05-04 胡大苇 A soil remediator for eliminating harmful bacteria

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3293128A (en) * 1961-11-24 1966-12-20 Lilly Co Eli Anthelmintic hygromycin b derivatives and process of using same
US3781301A (en) * 1964-10-08 1973-12-25 Ciba Geigy Ag Phenyl carbamates
US4059615A (en) * 1968-11-07 1977-11-22 Hooker Chemicals & Plastics Corporation Side chain halogenated alkylphenyl haloformates and derivatives
US4179277A (en) * 1976-03-12 1979-12-18 Bayer Aktiengesellschaft 4,5-Dichloroimidazole-2-carboxylic acid derivatives
US4226615A (en) * 1978-09-05 1980-10-07 Monsanto Company Plant growth regulators
US4309422A (en) * 1980-09-15 1982-01-05 Velsicol Chemical Corporation Benzoylhydrazones of aryl phosphates and phosphonates
US4584318A (en) * 1981-06-15 1986-04-22 Fmc Corporation Nematicidal salicylaldehyde derivatives
US5129951A (en) * 1991-06-28 1992-07-14 The United States Of America As Represented By The Secretary Of Agriculture Aromatic aldehydes and alcohols as potato tuber sprout inhibitors
US6720352B1 (en) * 1999-05-10 2004-04-13 Illovo Sugar Ltd Compositions and process for nematode control
US20050102024A1 (en) * 2001-04-20 2005-05-12 John Riccotta Apparatus and method for fixation of vascular grafts
US6921539B2 (en) * 2002-02-20 2005-07-26 Dusan Ninkov Antimicrobial therapeutic compositions and method of use
US20060078733A1 (en) * 1999-09-17 2006-04-13 Jassan Genaro C Absorbent composition of matter for controlled release of essential oils
US20110218104A1 (en) * 2010-03-03 2011-09-08 Auburn University Biodiesel Solvents in Pesticide Compositions

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0748208A (en) * 1993-08-06 1995-02-21 Ube Ind Ltd Nematode control agent
US6124275A (en) * 1998-05-01 2000-09-26 Summus Group, Ltd. Methods and compositions for controlling a pest population
US20040082479A1 (en) * 2001-01-17 2004-04-29 David Mirelman Method for soil sterilization from pathogens
EP1744624B1 (en) * 2004-04-26 2012-11-14 Future Tense Technological Development & Entrepreneurship Ltd. Pesticides containing salicylaldehyde and garlic extract
GB2413494A (en) * 2004-04-26 2005-11-02 Yoram Tsivion Pest control agent
GB0506759D0 (en) * 2005-04-02 2005-05-11 Medical Res Council Combination treatment methods
GB0507227D0 (en) * 2005-04-09 2005-05-18 Ecospray Ltd A pesticide and repellent
US20080255237A1 (en) * 2005-10-14 2008-10-16 Givaudan Sa Pesticidal Composition

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3293128A (en) * 1961-11-24 1966-12-20 Lilly Co Eli Anthelmintic hygromycin b derivatives and process of using same
US3781301A (en) * 1964-10-08 1973-12-25 Ciba Geigy Ag Phenyl carbamates
US4059615A (en) * 1968-11-07 1977-11-22 Hooker Chemicals & Plastics Corporation Side chain halogenated alkylphenyl haloformates and derivatives
US4179277A (en) * 1976-03-12 1979-12-18 Bayer Aktiengesellschaft 4,5-Dichloroimidazole-2-carboxylic acid derivatives
US4226615A (en) * 1978-09-05 1980-10-07 Monsanto Company Plant growth regulators
US4309422A (en) * 1980-09-15 1982-01-05 Velsicol Chemical Corporation Benzoylhydrazones of aryl phosphates and phosphonates
US4584318A (en) * 1981-06-15 1986-04-22 Fmc Corporation Nematicidal salicylaldehyde derivatives
US5129951A (en) * 1991-06-28 1992-07-14 The United States Of America As Represented By The Secretary Of Agriculture Aromatic aldehydes and alcohols as potato tuber sprout inhibitors
US6720352B1 (en) * 1999-05-10 2004-04-13 Illovo Sugar Ltd Compositions and process for nematode control
US20060078733A1 (en) * 1999-09-17 2006-04-13 Jassan Genaro C Absorbent composition of matter for controlled release of essential oils
US20050102024A1 (en) * 2001-04-20 2005-05-12 John Riccotta Apparatus and method for fixation of vascular grafts
US6921539B2 (en) * 2002-02-20 2005-07-26 Dusan Ninkov Antimicrobial therapeutic compositions and method of use
US20110218104A1 (en) * 2010-03-03 2011-09-08 Auburn University Biodiesel Solvents in Pesticide Compositions

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2775834A4 (en) * 2011-11-03 2015-10-07 Yoram Tsivion Biologically active compositions containing phenolic residue

Also Published As

Publication number Publication date
US8808767B2 (en) 2014-08-19
CA2720101C (en) 2013-06-04
CN101938903B (en) 2013-07-10
UY31142A1 (en) 2009-04-30
DK2254408T3 (en) 2013-02-25
PL2254408T3 (en) 2013-05-31
BRPI0811322B1 (en) 2020-11-10
PE20090821A1 (en) 2009-07-16
PT2254408E (en) 2013-03-18
BRPI0811322A8 (en) 2020-08-11
CL2008001710A1 (en) 2009-09-25
CY1113728T1 (en) 2016-06-22
EP2254408A2 (en) 2010-12-01
AR070001A1 (en) 2010-03-10
WO2008152589A3 (en) 2010-09-30
US20140161914A1 (en) 2014-06-12
BRPI0811322A2 (en) 2015-02-03
GB2450082A (en) 2008-12-17
CA2720101A1 (en) 2008-12-18
GB2450082B (en) 2011-07-06
HRP20130226T1 (en) 2013-04-30
EP2254408B1 (en) 2012-12-19
GB0711065D0 (en) 2007-07-18
CN101938903A (en) 2011-01-05
WO2008152589A2 (en) 2008-12-18
SI2254408T1 (en) 2013-04-30
ES2400745T3 (en) 2013-04-12
SA08290553B1 (en) 2012-09-17

Similar Documents

Publication Publication Date Title
Hell et al. Aflatoxin control and prevention strategies in key crops of Sub-Saharan Africa.
Mondal et al. Azadirachta indica-A tree with multifaceted applications: An overview
Diabaté et al. The effect of pesticides and aqueous extracts of Azadirachta indica (A. Juss) and Jatropha carcus L. on Bemisia tabaci (Gennadius)(Homoptera: Aleyrididae) and Helicoverpa armigera (Hübner)(Lepidoptera: Noctuidae) found on tomato plants in Côte d’Ivoire.
Abhishek et al. Review on integrated management of brinjal shoots and fruit borer, Leucinodes orbonalis (Guenee)
Prabawati et al. The abundance of canopy arthropods in South Sumatra (Indonesia) freshwater swamp main and ratooned rice applied with bioinsecticides and synthetic insecticide
US8808767B2 (en) Nematode control agent
Radha Comparative studies on the Effectiveness of Pesticides for Aphid control in Cowpea
Wojciechowicz-Żytko et al. Sambucus nigra L. as a reservoir of beneficial insects (Diptera, Syrphidae)
KR102033104B1 (en) Nematocide Composition Comprising Plant Extracts of Indian Shell Flower, Cinnamon, and Neem Seed as Effective Ingredients
Singh Insect Pest Management in Oilseeds Crops
Sharma et al. Effect of Heterodera cajani on biomass and grain yield of pigeon pea on vertisol in pot and field experiments
Okweche et al. Maize borer damage in Nigeria’s Guinea Savanna: Timing of planting overrides effects of insecticides treatments
Paul Bean pest management in East Africa: A scientific evaluation of organic insect control practices used by Tanzanian farmers
Srinivasan et al. Evaluation of bio-efficacy of botanicals against tomato pinworm, Tuta absoluta (Meyrick, 1917)
Sharma et al. Evaluation of drek, Melia azadirach for the management of fruitflies, Bactrocera tau in tomato
Mayse et al. Sustainable viticulture practices in the San Joaquin Valley of California
Seye et al. Effect of neem derivatives (Azacdirachta indica) on the mango mealybug (Rastrococcus invadens) for biological control
Faye et al. Effect of Biocidal Substances on Population Dynamics of Plutella Xylostella Linnaeus, 1758, Auxiliary Insects, and Cabbage Production in the Suburban Area of Dakar
Ahmad et al. Comparative potential of a new synergistic bio pesticide and synthetic pesticide on pest control and crop yield
Singh et al. Non chemical approach for management of whitefly in cotton-a review.
Akakpo The Use of Biopesticides to Control Insect Pests of Pawpaw (Carica Papaya)
FERDOUSI Effectiveness of traps and insecticides for the management of cucurbit fruit fly
Singh et al. Insect pest management in silvipastoral systems
BEGUM et al. Mymensingh;" Horticulture Research Centre, BARI, Gazipur.
Kabula et al. Potential larvicidal effects of Tephrosia vogelii leaf extract on Culex quinquefasciatus in Morogoro, Tanzania

Legal Events

Date Code Title Description
AS Assignment

Owner name: OMEX INTERNATIONAL LTD, BERMUDA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:BAHIRI, GIDON, MR;ELLIOTT, IAN, MR;REEL/FRAME:029324/0781

Effective date: 20121009

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION