CN1089552C - Fungicidal compositions - Google Patents

Abstract

The present invention relates to a fungicide composition which is used for controlling infection of white-rot micro-pyrenomycetes of allium and a control method of the fungicide composition. An effective dose of a triazole compound for killing fungi is applied to the allium or a growth place, and the triazole compound is showed as the first formula.

Description

Methods of Controlling Sclerotinia albicans Infection in Allium Plants

The present invention relates to the use of triazine compounds and mixtures to prevent, reduce or eliminate plant fungus infection of plants. In particular, the present invention relates to the prevention, reduction or elimination of plant infection by attack by organisms that cause Allium white rot.

Members of this group of alliums include leeks, garlic, dried bulb onions, Japanese-style knobby onions, and others. It is well known that plants of the Allium genus have been shown to be highly susceptible to Sclerotinia albicans (Allium white rot fungi). Once the fungus has established itself in the soil, it is extremely difficult to control or exterminate. The sclerotia from the fungus can be preserved in the soil for a long time because of years of monitoring on a soil that cannot grow Allium plants. Chemical control is not feasible. The current treatment methods, whether using iprodione (125g/Kg seed) as a seed treatment agent or using procymidon (4-6kg/ha) as a soil treatment agent, are not effective. Especially when the fungal infection is severe. Furthermore, the use of currently known fungicides can lead to phytotoxicity or adverse environmental consequences.

All these indicate that we need a more effective and/or environmentally friendly fungicide for the control of S. white-rot in this field.

We have now discovered that triazoles can be used as agents for the control of infection in Allium plants with astonishing efficiency. At the same time, plants have good drug resistance to it within the scope of application.

The term "disease control" as used herein refers to the control of disease alleviation, elimination or prevention. The term "plant" means plantlets, seedlings and seeds.

其中n为0或1；R₁为饱和的C3-6碳氢化合物。The present invention provides a method for controlling Allium plants infected with Sclerotinia albicans, which comprises applying a fungicidally effective amount of the compound of formula I to the plant or its planting place.

Wherein n is 0 or 1; R ₁ is a saturated C3-6 hydrocarbon.

Saturated C _3-6 hydrocarbons in the present invention include C _3-6 alkyl, such as n-butyl or t-butyl; C _3-6 cycloalkyl, such as cyclopentyl and C _3-6 -(cycloalkyl Alkyl), such as 1-cyclopentylethyl.

In the present invention, the compound of formula I is usually applied in the form of an agronomically acceptable composition. And especially the compound with molecular formula I is the best way to coat the outer layer of seeds. The benefit of this approach is that it ultimately results in lower levels of fungicide infiltration into the soil without serious environmental impacts.

To sum up, the present invention provides a method capable of controlling Allium plants from being infected with Sclerotinia albicans. The best method is to coat onion seeds, including those of Allium plants, with a fungicidally effective amount of the triazines of formula I in a coated manner.

In another embodiment of the present invention, coated seeds of plants of the genus Allium are provided, preferably onion seeds coated with an effective dose of the triazole of formula I.

The specific dosage of the triazine of formula I is determined according to different situations. Such as the specific active ingredient applied, climatic conditions, etc. In general, however, coating levels of about 0.25 g to 12 g per kilogram of seed can be satisfactorily controlled. The best range is about 0.5g-8.0g coating amount per kilogram of seeds. When applying, choose the dosage that can achieve the best balance between disease control and plant tolerance. For example, the optimum dose of cyproconazole is roughly in the range of 0.25-4.0 g per kilogram of seeds; the optimum dose of tebuconazole is in the range of 1-6 g per kilogram of seeds. (Contains approximately 250,000 seeds per kilogram of seeds). In fungicidally effective amounts, the compounds of the formula I are very well tolerated by plants.

Triazines of formula I useful in the method of the present invention include cyclaconazole and tebuconazole. These compounds can be used alone as active ingredients, or mixed with other triazine active ingredients represented by molecular formula I, or applied together with other effective fungicide ingredients. These other components include non-triazazole components such as iprodione, captan, metalaxyl, oxaxyl, benomyl, albiline, thiram, carbendazim, and mixtures thereof. For example, a mixture of thiram and carbendazim at a weight ratio of about 1:1 to 4:1. Other fungicides having broad-spectrum fungicidal activity and/or capable of preventing or inhibiting seed and soil disease can also be used. For the control of Sclerotinia white rot, whether tebuconazole or cyproconazole or their mixture is used, the weight ratio of them to other fungicides is not strict. For example, for effective and broad-spectrum fungal control, 0.25~ 12Kg of the compound of formula I and thiram and carbendazim prepared in a weight ratio of about 1:1 and 4:1 are formulated into a mixture with a total weight of 1-8g. For example, for every kilogram of onion seeds, good disease control can be obtained by using a fungicide prepared with a mixture of 0.5-2 g of cyproconazole and 3 g of thiram carbendazim at a ratio of 2:1.

Furthermore, another embodiment of the present invention provides a fungicide, which is made of formula I triazine or its mixture with an agronomically acceptable diluent, and is used to deal with onion Sclerotinia albicans infection of plants of the genus, especially onions.

The term "diluent" as used herein refers to any agronomically acceptable liquid or solid - including carriers - which can be added to a fungicidal composition to enhance availability and efficacy. In this way, the desired effect can be obtained and the application can be easily achieved by adding a diluent.

The diluent can be selected from talcum powder, kaolin, diatomaceous earth, xylene, water, etc. When applied by spray, such as water dispersion, concentrate or wettable powder, these can be added with surfactants such as wetting and dispersing agents.

As far as the fungicidal composition is suitable for the method of the present invention, the fungicidal composition can be applied in a conventional formulation prepared by a conventional method, preferably in the form of a seed coating.

Seed coating compositions suitable for use in the method of the present invention generally comprise about 5-50% by weight of a fungicide, triazole or other mixture of triazoles or active ingredients plus about 95-50% by weight of an agronomic Acceptable diluents and adjuvants commonly used in the art.

Agronomically acceptable diluents and adjuvants suitable for use in the seed coating formulations include activated charcoal, kaolin clay, polyvinyl acetate and copolymers thereof, pigments and water.

Seed coating formulations, eg as described above, can be applied in a manner known per se, so that the compound of formula I and the agronomically acceptable carrier are coated in a suitable coating form. Such as an aqueous suspension or a dry powder with good adhesion to the seeds, so that the ingredients of the preparation can be coated on the seeds once or in one layer, and if necessary, in two or more layers, For example, the inner layer can be coated with an agriculturally acceptable diluent and/or adjuvant, and then the second layer can be coated with the compound of formula I provided above together with a suitable agronomically acceptable diluent and adjuvant.

The following examples illustrate the invention. These examples are not intended to explain the limitations of the range of pairs.

Embodiment 1: seed coating agent

25 parts Cycloconazole

15 parts Dialkylphenoxy poly(vinyloxy)ethanol

15 parts Silica fine powder

44 parts kaolin fine powder

0.5 parts of pigment

0.5 part xanthan gum (xanthan)

100 copies

The above-mentioned components were mixed in a contraplex mill at 10,000 rpm, and ground to a particle size of less than 20 microns. The resulting preparation is applied to the seeds as an aqueous suspension using suitable equipment.

Embodiment 2: seed coating agent

45 parts Cycloconazole or Tebuconazole

1.5 parts Diamylphenol decanediol ether ethylene oxide adduct

2 parts spindle oil

51 parts fine talc powder

0.5 parts colorant (Luconyl ^R --BASF)

The mixture of the above components was ground in a reverse mill at 10000 rpm to an average particle size of less than 20 microns. The resulting dry powder has good adhesion and can be seed-dressed by mixing in a slowly rotating container for 2-5 minutes.

Embodiment 3: seed coating agent

4g Aatopam-A (comprising 25% by weight of carbendazim and 50% by weight of thiram)

4 g conventional wettable powder containing 25% by weight of tebuconazole.

4g vinyl acetate-ethylene copolymer

10g activated carbon

10g kaolin clay

10g blue pigment (Luconyl ^R -BASF)

8g white pigment (titanium dioxide)

300g water

The resulting formulation is applied to the seeds as an aqueous suspension in suitable equipment.

Example 4: Fungicidal activity

Treat onion seeds with a mixture of the following ingredients

4g Aatopam-N (comprising 25% by weight of carbendazim and 50% of thiram)

8g methylcellulose

20g kaolin clay

10g pigment

250g water

(hereinafter referred to as formulation 4) Alternatively, the onion seeds were treated with a 25% by weight wettable powder of cyproconazole in a mixture of the above formulation and the following compounds:

1 g (formulation 5)

3g (formulation 6) or

5g (formulation 7)

The seeds treated and obtained are listed in Table 1

Table 1 Treatment Example Seeds Treatment per kilogram of seed active ingredient grams control preparations 4 2g Fumei Double+1g multi -bacterial spirit 1 preparation 5 2g Fumei double+0.25 g cycrozazole 2g dosage 6 2g Fumei double+1g Carbendazim + 0.75g Cycloconazole 3 Preparation 7 2g Thiram + 1g Carbendazim + 1.25 Cycloconazole

The germination of the treated seeds was determined. Eight replicate assays were sown in soil naturally parasitized by Sclerotinia albicans. Count the number of diseased plants every other week and remove the damaged plants. The results are shown in Table 2, expressed as the number of new diseased plants counted each time and the total number of diseased plants throughout the test. Remove diseased plants after each count.

Table 2

a) The number of plants newly infected with S. albicans per time expressed as a percentage of the number of plants in the test. Treatment Example % of damaged plants every other week after sowing

Week 2, Week 3 Week 4 Week 6 Week, Week 7 31 9 17 6 181 0 4 5 9 6 162 1 3 1 3 7 3 0 0 0 0 0 3

b) The percentage of the accumulated strains infested by Sclerotinia albicans to the total number of strains in the experiment at each count. Treatment Example % of damaged plants every other week after sowing

First Week 2 Week 3 Week 3 Week 4 Week No. 7 Week 3 14 23 40 46 641 0 4 9 18 23 392 1 5 10 163 0 0 0 1 1 4

The seeds dressed in Treatment Example 3 (see Example 4) were stored for 6 months, and the germination test carried out after the storage period showed that the germination of treated seeds and untreated seeds did not change. Example 5 Granular preparation

In a ribbon blender, the granular carrier was homogeneously saturated with a 40% fungicide/solvent mixture (where the fungicide was cyproconazole or tebuconazole). Natural drying can also help mixing or heating at low temperature (eg: 50°C)

The resulting granular formulation has the following composition:

Fungicide/solvent 2.5 parts

Granular carrier 97.5 parts

The concentration of the fungicide is about 1% in 100.0 parts. A suitable support may be attapulgite or other standard supports. The granules thus obtained can be used for soil treatment.

Claims (9)

1. the method that infects of control allium white rot pyrenomycetes, it is included in the formula I compound that each platymiscium or its growth place impose the antifungal effective dose,

Wherein n be 0 or 1 and

R ₁Be saturated C ₃-C ₆Alkyl.

2. the method for claim 1, it comprises the allium seed is coated with the film that contains antifungal effective dose formula I compound.

3. the method for claim 2, it comprises that every Kg seed imposes 0.25～12g formula I compound.

4. the method for claim 3, it comprises that every Kg seed imposes 0.5～8g formula I compound.

5. the method for claim 4, it comprises that every Kg seed imposes 0.5～1.5g formula I compound.

6. the method for one of claim 2 to 5, wherein the allium seed is an onion seed.

7. the method for one of claim 1 to 5, its Chinese style I compound is a cyproconazole.

8. the method for one of claim 1 to 5, its Chinese style I compound is a Tebuconazole.

9. the application of the formula I compound of claim 1 in control allium white rot pyrenomycetes infects.