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GB2163652A - Fungicidal composition based on aluminium tris-(ethyl-phosphonate) - Google Patents

Fungicidal composition based on aluminium tris-(ethyl-phosphonate) Download PDF

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Publication number
GB2163652A
GB2163652A GB08521365A GB8521365A GB2163652A GB 2163652 A GB2163652 A GB 2163652A GB 08521365 A GB08521365 A GB 08521365A GB 8521365 A GB8521365 A GB 8521365A GB 2163652 A GB2163652 A GB 2163652A
Authority
GB
United Kingdom
Prior art keywords
acid
phosethyl
composition according
aqueous solution
composition
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.)
Granted
Application number
GB08521365A
Other versions
GB2163652B (en
GB8521365D0 (en
Inventor
Denis Barlet
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.)
Bayer CropScience SA
Original Assignee
Rhone Poulenc Agrochimie SA
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 Rhone Poulenc Agrochimie SA filed Critical Rhone Poulenc Agrochimie SA
Publication of GB8521365D0 publication Critical patent/GB8521365D0/en
Publication of GB2163652A publication Critical patent/GB2163652A/en
Priority to MYPI87002815A priority Critical patent/MY101391A/en
Application granted granted Critical
Publication of GB2163652B publication Critical patent/GB2163652B/en
Expired legal-status Critical Current

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Classifications

    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01NPRESERVATION 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
    • A01N25/00Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests
    • A01N25/22Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests containing ingredients stabilising the active ingredients
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01NPRESERVATION 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
    • A01N57/00Biocides, pest repellants or attractants, or plant growth regulators containing organic phosphorus compounds
    • A01N57/10Biocides, pest repellants or attractants, or plant growth regulators containing organic phosphorus compounds having phosphorus-to-oxygen bonds or phosphorus-to-sulfur bonds
    • A01N57/12Biocides, pest repellants or attractants, or plant growth regulators containing organic phosphorus compounds having phosphorus-to-oxygen bonds or phosphorus-to-sulfur bonds containing acyclic or cycloaliphatic radicals

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  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Dentistry (AREA)
  • Plant Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Pest Control & Pesticides (AREA)
  • Agronomy & Crop Science (AREA)
  • Wood Science & Technology (AREA)
  • Zoology (AREA)
  • Environmental Sciences (AREA)
  • Toxicology (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)

Abstract

The fungicidal compositions of the invention comprise, in aqueous solution, phosethyl A1 (aluminium tris-(ethyl phosphonate)) and, as stabilising agent, a water-soluble zinc salt of a weak acid (e.g. zinc acetate), and are especially suitable for injection into the trunks of crop trees or shrubs to combat attack by phytophagous fungi.

Description

SPECIFICATION Fungicidal composition based on aluminium tris-(ethyl phosphonate) The present invention relates to new fungicidal compositions based on a phosphorous acid ester, and to a method of combating fungal disease of plants using such compositions.
French Patent 2,254,276 describes compositions for combating fungal diseases of plants, which contain, as the active ingredient, at least one salt of an alkyl-phosphorous acid. These compositions are effective against many phytophagous fungi, such as Phycomycetes, in particular Plasmopara viticola and various Phytophthora. In practice, aluminium ethyl phosphite (otherwise known as aluminium tris-(ethyl phosphonate) and hereinafter identified as "phosethyl Al") is used commercially, in the form of a wettable powder, for treatment by spraying the leaves. Although this formulation is quite effective when used in this manner, in particular for protecting vines, its effectiveness takes longer to appear when it is applied curatively to tropical crops attacked, aften heavily, by fungi of the Phytophthora type, such as Phytophthora cinnamoni which cause avocado rot or rot of citrus fruits.
In fact, the amounts absorbed by a foliage of low absorbency are relatively small, and are insufficient if trees which have already been attacked are treated curatively. This necessitates more applications, rendering the treatment prohibitive, slow in all respects and even inadequate against severe attacks by the fungi.
It has now been found that these diseases can be effectively comabated by application, in particular by injection into the trunks of crop trees or shrubs, of a stabilised aqueous solution of phosethyl Al. However, this poses a problem inasmuch as this active ingredient is susceptible to hydrolysis in an aqueous medium, which substantially and progressively decreases its concentration, making it impossible to obtain concentrated aqueous compositions which are stable over a period of time.
The present inventon provides a fungicidal composition which comprises, in aqueous solution, phosethyl Al and, as a stabilising agent, a water soluble zinc salt of a weak acid.
The invention also relates to a process for stabilising aqueous solutions of phosethyl Al, which comprises adding a water-soluble zinc salt of a weak acid, as a stabiliser, to the aqueous solution of phosethyl Al. The term "weak acid" is to be understood as meaning a mineral acid or preferably an organic acid, such as an aliphatic acid for example a lower aliphatic acid containing 1 to 6 carbon atoms such as acetic acid, propionic acid, butyric acid, lactic acid or citric acid, or an aminoacid, such as ethylene-diaminetetracetic acid.
The amount of stabiliser depends on the nature thereof and the concentration of phosethyl Al in the aqueous compositions. In fact, if the stabiliser is present either in too small an amount or, on the other hand, in too large an amount, the solution is not clear which signifies that solubilisation of the active ingredient is insufficient, with the result that the effectiveness is correspondingly limited. Surprisingly, it has moreover been found that the most suitable amount is not that corresponding to the stoichiometric amount relative to phosethyl Al. Generally amounts from 30 to 80% of the stoichiometric amount are suitable. For example, in the case of zinc acetate, about half the stoichiometric amount gives a stable clear solution, whilst twice this amount gives rise to a precipitate.
The aqueous composition according to the invention may also contain other water-soluble adjuvants, such as surface-active agents, although this is not necessary for injectable solutions.
It may also contain certain oligo-elements which promote growth of the plants, eg. crop trees or shrubs or are advantageous in combating deficiencies, in suitable amounts.
The phosethyl Al is generally present in the compositions according to the invention in a concentration of between 1 and 120 g/litre, preferably between 10 and 110 g/litre.
This solution can be applied to plants to combat attacks by phytophagous fungi by any suitable treatment, such as spraying of the leaves or soaking of the roots. Excellent results have been obtained by injection into the trunk of diseased crop trees, e.g., avocado trees, and the process can also be applied to other trees, such as citrus fruit trees, or hevea or cocoa trees.
The treatment is carried out by first making holes distributed around the trunk of the tree.
In a second stage, a defined amount of the aqueous phosethyl Al solution employed, which may vary from 0.1 to 5 g/m2 of soil covered by the foliage, is injected into the holes with any appropriate device, with or without using pressure.
The liquid is absorbed slowly and is preferably kept under pressure in the injection apparatus.
When the injection has ended, it may be desirable to block the hole or holes with the aid of a material which is non-aggressive towards the plant tissue, e.g., a wax, which may contain adjuvants, such as disinfectants, in order to reduce the risk of introducing secondary diseases.
The number of treatments is very small, especially with respect to the number of interventions necessary when the leaves are sprayed. For example, on a severely attacked crop tree or shrub, effective curative treatment is obtained in the first year with two injections, and in the following years treatment once per year is sufficient to keep the crop tree or shrub healthy or on the way to recovery. The effectiveness of the treatment is remarkable, heavily attacked crop trees or shrubs being cured within 2 years, which is surprising since other systemic fungicides which are usually active on these fungi are ineffective when injected under the same conditions.
The Examples which follow illustrate the invention.
Example 1: The three following compositions, in which amounts are by weight, are prepared by dissolving successively phosethyl Al and, where appropriate, zinc acetate in water: Composition of the invention Control Composition 1 2 Technical grade 98 % pure Phosethyl Al ....... 102 102 102 Zinc acetate dihydrate - 47 70 Water qsp 1 litre .... 948 916 898 The amounts of acetate in Compositions 1 and 2 correspond respectively to half the stoichiometric amount of phosethyl Al, for composition 1, and to three quarters of this stoichiometric amount, for composition 2.
The three solutions are subjected to a stability test at 500C for 1 month, after which the relative degradation of phosethyl Al and the appearance of the solution are evaluated. The results are shown in the following table:
I Evaluation criterion : Invention after 1 month at 500C : Control I 1 2 I I I I ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ I ~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~ I Relative degradation I of phosethyl Al l 100 % : 13 16 I I I ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ I ~~~~~~~~~~~~~~~~ I ~~~~~~~~~~~~~~~~~~~~~ I Appearance of the I I I solution (initially : Precipitate : Clear Slightly clear) l I cloudy I I I I I I I ~~~~~~~~~~~~~~~~ I ~~~~~~~~~~~~~~~~~~~~~ This table clearly shows that after 1 month at 50 C: -in the control solution, the phosethyl Al is completely degraded and a precipitate forms in the solution. This solution is thus neither stable nor clear; -in solutions 1 and 2 according to the invention, the degradation of phosethyl Al is limited in an acceptable manner; it will be seen that the decomposition of phosethyl Al is less in solution 1 than in solution 2.
Example 2: Two compositions are prepared by diluting composition 1, obtained in Example 1, once and, respectively, twice. Compositions containing, respectively, 51 and 25.5 grams of 98% pure phosethyl Al and 23.5 and 11.75 grams of zinc acetate per litre are thus obtained.

Claims (14)

1. A fungicidal composition which comprises, in aqueous solution, phosethyl Al and, as a stabilising agent, a water soluble zinc salt of a weak acid.
2. A composition according to claim 1 in the form of a clear aqueous solution.
3. A composition according to claim 1 or 2 wherein the weak acid is an organic acid.
4. A composition according to claim 1 or 2 wherein the weak acid is an aliphatic acid or an aminoacid.
5. A composition according to claim 1 or 2 wherein the weak acid is acetic acid, propionic acid, butyric acid, lactic acid, citric acid or ethylenediaminetetracetic acid.
6. A composition according to any one of claims 1 to 5, in which the stabilising agent is zinc acetate.
7. A composition according to any one of claims 1 to 6 in which the stabilising agent is present in an amount from 30% to 80% of the stoichiometric amount of phosethyl-Al.
8. A composition according to any one of claims 1 to 7 which comprises from 1 to 120 g/litre of phosethyl Al.
9. A composition according to claim 1 substantially as hereinbefore described in Example 1 or 2.
10. A process for the preparation of a stable aqueous solution comprising phosethyl Al according to any one of claims 1 to 9, which comprises adding a water-soluble zinc salt of a weak acid to an aqueous solution comprising phosethyl Al.
11. A process according to claim 10 substantially as hereinbefore described in Example 1.
12. A method of combating attacks by phytophagous fungi on crop plants which comprises applying to the plants an effective amount of a composition according to any one of claims 1 to 9.
13. A method according to claim 12 in which the composition is injected into the trunk of a crop tree or shrub.
14. A method according to claim 13 substantially as hereinbefore described.
GB08521365A 1984-08-29 1985-08-28 Fungicidal composition based on aluminium tris-(ethyl phosphonate) Expired GB2163652B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
MYPI87002815A MY101391A (en) 1984-08-29 1987-10-01 Fungicidal composition based on aluminium tris - (ethyl phosphonate)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8413557A FR2569530B1 (en) 1984-08-29 1984-08-29 FUNGICIDAL COMPOSITION BASED ON ALUMINUM TRIS ETHYL PHOSPHONATE

Publications (3)

Publication Number Publication Date
GB8521365D0 GB8521365D0 (en) 1985-10-02
GB2163652A true GB2163652A (en) 1986-03-05
GB2163652B GB2163652B (en) 1988-04-20

Family

ID=9307383

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08521365A Expired GB2163652B (en) 1984-08-29 1985-08-28 Fungicidal composition based on aluminium tris-(ethyl phosphonate)

Country Status (14)

Country Link
AU (1) AU571995B2 (en)
BR (1) BR8503988A (en)
EG (1) EG17846A (en)
FR (1) FR2569530B1 (en)
GB (1) GB2163652B (en)
GR (1) GR852006B (en)
HU (1) HUT38204A (en)
IL (1) IL75942A (en)
IT (1) IT1186526B (en)
MA (1) MA20509A1 (en)
MY (1) MY101391A (en)
OA (1) OA08084A (en)
PT (1) PT81042B (en)
ZA (1) ZA856518B (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990007878A1 (en) * 1989-01-23 1990-07-26 Rhone Poulenc Agro Kabushiki Kaisha Stabilized pesticide composition
US5133891A (en) * 1990-04-27 1992-07-28 Rhone Poulenc Ag Co. Treatment of plants for frost protection
GB2304708A (en) * 1995-09-05 1997-03-26 Rhone Poulenc Agrochimie Improving the fruit yields from banana plants
US5656281A (en) * 1989-12-14 1997-08-12 Rhone-Poulenc Agrochimie Water-dispersible granules of phosphite fungicidal products
WO2002102159A1 (en) * 2001-06-20 2002-12-27 Alastair James Forsyth Plant treatment composition
WO2014095366A3 (en) * 2012-12-18 2015-01-29 Beiersdorf Ag Improved protection against body odor

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IL82311A (en) * 1986-05-09 1992-06-21 Rhone Poulenc Agrochimie Bactericidal compositions based on phosphorous acid derivatives
CN112544619B (en) * 2019-09-25 2022-04-12 沈阳中化农药化工研发有限公司 Bactericidal composition

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1389940A (en) * 1971-05-03 1975-04-09 Rohm & Haas Metal salt stabilized coating compositions
GB2137498A (en) * 1983-03-31 1984-10-10 Rhone Poulenc Agrochimie Fungicidal compositions based on aluminium tris-(ethyl phosphonate)

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2254276B1 (en) * 1973-12-14 1977-03-04 Philagro Sa

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1389940A (en) * 1971-05-03 1975-04-09 Rohm & Haas Metal salt stabilized coating compositions
GB2137498A (en) * 1983-03-31 1984-10-10 Rhone Poulenc Agrochimie Fungicidal compositions based on aluminium tris-(ethyl phosphonate)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990007878A1 (en) * 1989-01-23 1990-07-26 Rhone Poulenc Agro Kabushiki Kaisha Stabilized pesticide composition
US5656281A (en) * 1989-12-14 1997-08-12 Rhone-Poulenc Agrochimie Water-dispersible granules of phosphite fungicidal products
US5133891A (en) * 1990-04-27 1992-07-28 Rhone Poulenc Ag Co. Treatment of plants for frost protection
GB2304708A (en) * 1995-09-05 1997-03-26 Rhone Poulenc Agrochimie Improving the fruit yields from banana plants
GB2304708B (en) * 1995-09-05 1999-03-17 Rhone Poulenc Agrochimie Method for improving fruit yields from banana plants
WO2002102159A1 (en) * 2001-06-20 2002-12-27 Alastair James Forsyth Plant treatment composition
WO2014095366A3 (en) * 2012-12-18 2015-01-29 Beiersdorf Ag Improved protection against body odor
AU2013361865B2 (en) * 2012-12-18 2018-05-10 Beiersdorf Ag Improved protection against body odor

Also Published As

Publication number Publication date
HUT38204A (en) 1986-05-28
IL75942A (en) 1989-05-15
EG17846A (en) 1991-03-30
PT81042B (en) 1988-01-22
AU4669685A (en) 1986-03-06
GR852006B (en) 1985-12-19
GB2163652B (en) 1988-04-20
BR8503988A (en) 1986-06-10
MA20509A1 (en) 1986-04-01
MY101391A (en) 1991-10-23
AU571995B2 (en) 1988-04-28
IT8548404A0 (en) 1985-07-24
PT81042A (en) 1985-09-01
IT1186526B (en) 1987-11-26
IL75942A0 (en) 1985-12-31
FR2569530B1 (en) 1986-09-05
GB8521365D0 (en) 1985-10-02
OA08084A (en) 1987-03-31
ZA856518B (en) 1986-04-30
FR2569530A1 (en) 1986-03-07

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PCNP Patent ceased through non-payment of renewal fee

Effective date: 19930828