AU2002214958A1

AU2002214958A1 - Fungicidal formulation

Info

Publication number: AU2002214958A1
Application number: AU2002214958A
Authority: AU
Inventors: Michael Aven; Ewald Sieverding
Original assignee: BASF SE
Current assignee: BASF SE
Priority date: 2000-08-25
Filing date: 2001-08-24
Publication date: 2002-05-30
Anticipated expiration: 2021-08-24

Description

Fungicidal formulation

Description

As a rule, inert carrier ingredients must bei used to bring crop protection agents, for example, fungicidal compounds, into a form that the user can apply them either as such, or after dilution with water. The choice of formulation type and inert ingredients for that formulation type often determines to a significant extent whether the actie ingredient can display its full activity on application.

The efficacy of the active components can often be improved by addition of other .(active) ingredients. The observed efficacy of the combination of ingredients can sometimes be significantly higher than that would be expected from the amounts of the individual ingredients used, thus indicating synergism from the components of the combination.

The usual components of formulations such as carriers and inert ingredient (e.g. organic solvents, suspension agents, emulsion agents, wetting agnets, solubilizing agents) which do not themselves possess pesticidal activity, however, do not usually lead to an unexpected increase in efficacy.

International Patent Application WO 95/01722 discloses pesticidal formulations containing non-ionic surface-active agents which can be selected, inter alia, from liquid polyalkoxylated aliphatic alcohols. However, the addition of these agents is directed to improving the storage stability of the formulations, and there is no report of enhancing the activity of fungicides used in the formulations .

U.S. Patent 4,851,421 discloses the use of polyalkylene-type non- ionic surface active agents derived from the alkoxylation of fatty alcohols with alkyleneoxides, polyoxyalkylene mono- or dialkylphenyether or polyoxyalkylene sorbitan fatty acid esters.

It is an object of this invention to provide methods for further enhancement of the efficacy of said fungicidal triazolopyrimidi- nes . It is another object of this invention to provide fungicidal compositions of said triazolopyrimidines and adjuvants, as well as methods for their use in the control of phytopathogenic fungi . -There is ongoing research to identify suitable adjuvants which combination with the active fungicidal ingredient provide a means to lower the dose of active fungicidal agent required for effective disease control. This goal is desirable from both an econo- mic and an environmental standpoint.

EP-A 71 792 and EP-A 550 113 disclose fungicidal triazolopyrimi- dine compounds. EP-A 943 241 describes the enhancement of the fungicidal efficacy of said triazolopyrimidines by the addition of selected adjuvants from he liqid polyalkoxylated aliphatic alcohol class.

It has now been found that the effective amounts of fungicidal triazolopyrimidines of formula I

in which

R¹ and R² independently denote hydrogen or

Cι-Cιrj-alkyl, C₂-Cιo~alkenyl, C₂-Cιo-alkynyl, or C -C o-alkadienyl ,

C -Cιo-cycloalkyl, phenyl, naphthyl, or

5- or 6-membered heterocyclyl, containing one to four nitrogen atoms or one to three nitrogen atoms and one sulfur or oxygen atom, or

5- or 6-membered heteroaryl, containing one to four nitrogen atoms or one to three nitrogen atoms and one sulfur or oxygen atom, or

where R¹ and R² radicals may be unsubstituted or may carry one to three groups R^a,

R^a is cyano, nitro, hydroxyl, Ci-C_δ-al yI, Cx-Cg-haloal- kyl, C₃-C,₆-cycloalkyl, Cχ-C₆-alkoxy, Ci-Cg-haloalkoxy, Ci-Cg-alkylthio, Ci-Cg-alkylamino, di-Ci-Cg-alkylamino, C -C₆-alkenyl, C₂-C₆-alkynyl, C₃-C₆-alkynyloxy and Cι-C₄-alkylenedioxy; or

R¹ and R² together with the interjacent nitrogen atom represent a 5- or 6-membered heterocyclic ring, containing one to four nitrogen atoms or one to three nitrogen atoms and one sulfur or oxygen atom, which may be substituted by one to three R^a radicals;

R³ represents halogen or Ci-Cg-alkyl or Ci-Cβ-alkoxy;

n represents an integer from 0 to 5 ; and

Hal represents halogen;

which must be applied can be lowered considerably with respect to the amounts usually employed to achieve the same fungicidal effect, if these fungicidal compounds or their formulations are applied in combination with one or more adjuvants selected from the groups consisting of

a) non-ionic water-soluble mixed polyalkoxylated aliphatic alcohol surfactants,

b) non-ionic water soluble ethoxylated aliphatic alcohol surfactants ,

c) amine ethoxylates, and

d) micronized polymeric waxes.

The biological activity of the active ingredient of formula I can be increased by including any of these adjuvants in the spray dilution or directly in the formulation. An adjuvant is defined here as a substance which can increase the biological activity of an active ingredient but is^' not itself significantly biologically active. The adjuvant can either be included in the formulation or can be added to the spray tank together with the formulation containing the active ingredient . The water-soluble mixed polyalk- oxylated or ethoxylated aliphatic alcohols are particularly useful for liquid formulations, in particular for aqueous suspension concentrates (SC) . The mixed polyalkoxylated adjuvants are containable by alkoxylation of fatty alcohols having 8-18 C-atoms, with alkylene oxides having 2-6, preferably with a mixture of ethylene oxide and propylene oxide. The aliphatic moieties of the said fatty alcohols may be straight-chained or branched. The ethoxy to propoxy ratio is from 50:50 to 90:10. Preferred water soluble non-ionic surfactants of the mixed alkoxylated aliphatic alcohol class are mixed random or block oligomers of formula II

H_2n+lC_n-0- (CH₂CH₂0) _x (CH₂CH tCH₃ ) 0) _yH ( II )

wherein n is an integer from 8 to 18; x is an integer from 3 to 10; and y is an integer from 1 to 3.

Of particular interest are those water soluble mixed polyalkoxylated aliphatic alcohols which are commercially available under the trademark Plurafac® LF (Tensid-Chemie, Kδln / BASF AG, Ludwigshafen) . In particular Plurafac® LF 300 has been proven to be especially advantageous .

The water soluble polyethoxylated adjuvants are obtainable in similar fashion and are straight chained or branched Cιo-₂₅ alcohols ethoxylated with 10 to 25 ethoxy groups. Particularly preferred is Lubrol® 17A17, commercially available from Uniqema, Everberg, Belgium.

The amine ethoxylate adjuvants are tertiary amine ethoxylates based on primary amines such as oleyl amine and tallow amine. Par- ticularly preferred are those comercially available under the trademark Berol 381® and Berol 303® (Etho een® S22) from Akzo Nobel Surface chemistry, Sweden.

A particularly preferred micronized polymeric wax is a modified • polyethylene wax commercially available under the trademark ®Ce- ridust 9615A from Clariant GmbH, Augsburg, Germany.

The enhancement in efficacy by addition of the said adjuvants can be abserved for the fungicidal triazolopyrimidines of formula I, preferably, wherein

R¹ and R² together with the adjacent nitrogen atom represent an optionally substituted 6-membered heterocyclic ring, or wherein R¹ represents a Cι_₆~alkyl, a Cι_₆-haloalkyl , in particu- lar Cι_₆~fluoroalkyl , or a C₃_₈-cycloalkyl group and R² represents a hydrogen atom or a Cι_₆-alk^'yl group and/or wherein (R3⁾n represents

wherein Li represents a halogen atom, preferably fluorine or chlorine and L₂ and L each independently represents a hydro- gen atom or a halogen atom, preferably fluorine and/or wherein

Hal represents a chlorine atom.

In a particularly preferred embodiment the triazolopyrimidine is 5-chloro-6- (2-chloro-6-fluorophenyl) -7-N- (4-methylpiperid-l-yl) - [1, 2 , 4] triazolo [1, 5-α]pyrimidine coded compound IA, and 5-choro-6- (2,4, 6-trifluoro-phenyl) -7- (2,2,2, -trifluoro-1-methyl- amino) [1, 2 , ] triazolo [1, 5-α]pyrimidine coded compound IB.

The adjuvants of the present invention can be included in the formulation or added in a suitable formwith the preparation of the spray mix (tank mix) . In this latter case, they are added preferably as a separate preparation with the other components such as a dispersing agent or an antifoam and, where desirable, with further adjuvants so as to ensure that they are homogenously dispersed in the spray mix.

The present invention also relates to fungicidal formulatioms with at least mone compound of formula I, adjuvants and/or carrier substances characterised by their containing, in addition to the conventional adjuvants and carriers, one ore more adjuvants selected form the group consisting of

a) non ionic water-soluble mixed polyalkoxylated aliphatic alcohol surfactants,

b) non-ionic water soluble ethoxylated aliphatc alcohol surfactants,

c) amine ethoxylates, and

d) micronized polymeric waxes. The fungicidal compounds can be applied as normal commercial formulations with adjuvants accoring to the invention, and where desirable, with additional components such as antioxidants and emulsion agents.

The appropiate relative amounts of active ingredientand the water-soluble adjuvant lie, in accordance with the invention, between 100:75 and 100:100,000, preferably between 100:90 and 100:50,000 and, more preferably, between 100:125 and 100:5,000. In general and within certain limits, the fungicidal efficacy can be enhanced to a higher degree by the addition of larger amounts of the adjuvant.

In a preferred embodiment the adjuvant is added to the tank mix together with the triazolopyrimidine as a formulation.

The present invention also relates to a kit for the preparation of a spray mixture consisting of two separate containment:

1) a containment which comprises at least one fungicide of formula I and conventional inert ingredients and carriers;

2) a containment which comprises at least one adjuvant selected from the group consisting of

a) non-ionic water-soluble mixed polyalkoxylated aliphatic alcohol surfactants,

b) non-ionic water soluble ethoxylated aliphatic alcohol surfactants,

c) amine ethoxylates, and

d) micronized polymeric wax.

In a preferred embodiment said kit will consist of two bottles with dispensing means which allow the easy and correct addition of the active ingredient (1) and the adjuvant (2) to the tank mix.

Recommended doses for various applications are known for the fungicidal compounds of formula I where the efficacy can be enhanced in accordance with the invention. Addition of the adjuvants suggested here can (depending on the active ingredient, the adjuvant and their amounts)^' reduce the amount of active ingredient per hectare required in these recommendations by half or more, whe- reby it becomes possible to control additional diseases at reasonable doses .

In a preferred embodiment the adjuvants in combination with the fungicide of formula I are applied at rates of 40 to 4000 ml/ha, preferably 50 to 3000 ml/ha, in particular 60 to 2000 ml/ha.

An important advantage is the rapid onset and the high, persistency of activity on use of the new additives. This enlarges the periad for application of the fungicide and, hence, makes it more useful .

The fungicidal formulations according to the present invention can be used in combination with said additives prophylactically and curatively.

The adjuvants according to the invention, the compounds of formula I, and usual adjuvants and carriers can be processed to the preferably fluid or dispersible solid formulations known in the art, for example, as solutions, emulsions, wettable powders (WPs) , suspension concentrates (SCs) , emulsion concentrates (ECs) , low volume or ultra low volume preparations and water dispersible granules (WGs) .

As well as fluid and/or solid carries or solubilising agents such as organig solvents like ketones, alcohols, fluid aliphatic, aliphatic or aromatic compounds, fine natural or synthetic silicates or carbonates, the preparations usually contain ionic and/ or non-ionic surfactants which function as emulsion, dispersing or wetting agents. Antifoam and antifreeze agents may also be added. Suitable adjuvant and carriers substances are described in the literature and well known to the persons skilled in the art.

A composition according to the invention preferably contains from 0.5 % to 95 % by weight (w/w) of active ingredient.

A carrier in a composition according to the invention is any material with which the active ingredient is formulated to facilitate application to the locus to be treated, which may for example be a plant, seed or soil, or to facilitate storage, transport or handling. A carrier may be a solied or a liquid, including material which is normally a gas but which has been compressed to form a liquid. Aqueous dispersions and emulsions, for example compositions obtained by diluting the formulated product according to the invention with water, also lie within the scope of the invention.

Of particular interest in enhancing the duration of the protective activity of the compounds of this invention is the use of a carrier which will provide slow release of the pesticidal compounds into the environment of a plant which is to be protected.

Examples of formulations according to the invention are shown in the following formulations A and B:

Formulation A: Suspension concentrate ( SC )

¹ Witco Corporation, Houston, USA

² Tensid-Chemie, Kδln / BASF AG, Ludwigshafen, Germany ³ Rhodia GmbH, Frankfurt, Germany Zeneca GmbH, Frankfurt, Germany

⁵ Vanderbilt, Norwalk, USA

The SC formulation described above is mixed before applcation with water to give a spray mix with the desired concentration of active ingredient. A non-ionic surface-active agent selected from the water-soluble mixed polyalkoxylated aliphatic alcohol class, in particular Pluraf c® LF300 (250 g/1), is added to the resulting tank mix. Formulation B: Suspension Concentrate (SC)

¹ Witco Corporation, Houston, USA ² Tensid-Chemie, Kδln / BASF AG, Ludwigshafen, Germany

³ Zeneca GmbH, Frankfurt, Germany

⁴ Rhodia GmbH, Frankfurt, Germany

⁵ Vanderbilt, Norwalk, USA

The SC formulation described above is mixed before application with water to give a spray mix with the desired concentration of active ingredient. A non-ionic surface-active agent selected from the water-soluble mixed polyalkoxylated aliphatic alcohols, in particular Plurafac® LF 300 (150 g/1) and additionally a non-ionic surface-active agent selected from the water soluble polyethoxy- lated aliphatic alcohol class, in particular Lubrol 17A17 (150 g/1) is added to the resulting tank mix.

It is also an object of the invention to suggest a method for the control of phytopathogenic fungi, characterised by the use of the compounds of formula I, in particular formular IA in combination with one or more adjuvants selected from the groups consisting of

a) non-ionic water-soluble mixed polyalkoxylated aliphatic alcohol surfactants, b) non-ionic water soluble ethoxylated aliphatic alcohol surfactants, c) amine ethoxylates, and d) micronized polymeric waxes.

Plant diseases that can be combated with the fungicidal formulations according to the present invention diseases caused by Asco- mycete fungi, such as Erysiphales as for example Erysiphe cichoracearum or Uncinula necator, and Dothideals as for example Venturia inaequalis or Septoria tritici (Mycosphaerella gramini- cola) . For a more clear understanding of the invention, specific examples thereof are set forth below.

The test results described below demonstrate the enhancement in fungicidal efficacy of triazolopyrimidines of formula I by the addition of adjuvants according to the invention.

Example 1

Greenhouse Evaluations for Curative and Residual Fungicidal Activity

The formulated compound (see formulation below) was prepared as an aqueous suspension using concentrations of 100, 20 and 4 ppm active ingredient (a.i.) and was applied to greenhouse plants using a single-nozzle overhead rack sprayer at an application rate of 200 litre/ha. Within the 200 1/ha the compound was alternatively in-tank mixed with 1000 ppm of adjuvant (s) (as given in tale of results) . In case two adjuvants were added to the compound, the concentration of each adjuvant was 500 ppm.

Barley seedlings (var. 'Golden Promise') and wheat seedlings (var. 'Kanzler') were grown to the primary leaf stage (ca. 1 week old) in 6-cm-diameter pots in the greenhouse. Plants for both cu- rative and residual tests were sprayed at the same time with inoculations of the pathogens being done in different days.

For curative tests, barley and wheat plants were inoculated 2 days prior to compound treatment by dusting with conidia of Blu- meria (Erysiphe) graminis f.sp. hordei or B. graminis f.sp. tritici to create powdery mildew diseases. Plants were kept in the greenhouse until treated. After tratment, the plants were returned to the greenhouse and kept there until powdery mildew disease symptoms /signs developed on untreated plants.

Plants were than evaluated for percent disease on the treated primary leaves. For curative rust tests, wheat plants were inoculated 2 days prior to compound treatment by spraying with a ure- diniospore suspension in 0.05 % aqueous Tween 10 (1 mg spores per ml) of Puccinia recondita, kept in a moist infection chamber for one day then moved to the greenhouse until treated. After treatment the plants were kept in the greenhouse until disease sym- toms/signs developed on a untreated plants. Plants were then evaluated for percent disease on the treated primary leaves . For residual tests, plants were treated first and then kept for 4 days in the greenhouse before being inoculated with the pathogens as described for curatuve tests . Inoculated plantes were kept in the greenhouse until desease symptoms/signs develop on untreated plants . Plants were the evaluated for percent desease on the treated primary leaves .

Disease control efficacy was calculated from the percent disease values using the following formula:

% infected leaf area in treated plants

% disease control=100-

% infected leaf area in untreated plants

Table I gives the means of the efficacy (%control) of the three concentrations of compound IA used. This is accepted because the adjuvant concentrations were the same at all the compound a.i. concentrations used.

The composition of formulation R in Table I is

Formulation R: Suspension Concentrate (SC)

¹ Uniqema, Everberg, Belgium

² Rhodia GmbH, Frankfurt, Germany

³ Zeneca GmbH, Frankfurt, Germany Table I

t

* WPM = wheat powdery mildew; WLR = wheat leaf rust, BPM = barely powdery mildew

Claims

1. A concentrated aqueous fungicidal formulation for application to plants comprising at least one triazolopyrimidine of formula I

in which

R¹ and R² independently denote hydrogen or

Cι-Cιo-alkyl, C₂-C₁₀-alkenyl, C₂-Cι₀-alkynyl, or

C₄-Cιo-alkadienyl ,

C-Cιo-cycloalkyl, phenyl, naphthyl, or

5- or 6-membered heterocyclyl, containing one to four nitrogen atoms or one to three nitrogen atoms and one sulfur or oxygen atom, or 5- or 6-membered heteroaryl, containing one to four nitrogen atoms or one to three nitrogen atoms and one sulfur or oxygen atom, or

R^a is cyano, nitro, hydroxyl, Ci-Cg-alkyl, Ci-Cg-halo- alkyl, C₃-Cg-cycloalkyl, Cχ-Cg-alkoxy, Ci-Cg-haloal- koxy, Ci-Cβ-alkylthio, Ci-Cg-alkylamino, di- Ci-Cg-alkylamino, C₂-Cg-alkenyl, C₂-C₆-alkenyloxy, C-C₆-alkynyl, C₃-Cg-alkynyloxy and Cι-C-alkylene- dioxy; or

R³ represents halogen or Ci-Cg-alkyl or Ci-Cg-alkoxy;

n represents an integer from 0 to 5 ; and

Hal represents halogen

together with one or more adjuvants selected from

a) non-ionic water-soluble mixed polyalkoxylated aliphatic alcohol surfactants,

b) non-ionic water soluble ethoxylated aliphatic alcohol surfactants,

c) amine ethoxylates, and

d) micronized polymeric waxes,

the adjuvant is present in an amount sufficient to provide a ratio of the compound of formula 1 to adjuvant at 100:75 to 100:100.000 in the applied formulation.

2. The formulation according to claim 1 comprising an additional fungicidal compound.

3. The formulation according to claim 1 or 2 , wherein the rela- tive proportion of the triazolopyrimidine of formula I to adjuvant a, b, c and d is from 100:90 to 100:50,000.

4. The formulation according to claim 1 to 3 , wherein the relative proportion of the triazolopyrimidine of formula I to said adjuvant a, b, c and d is from 100:125 to 100:5,000.

5. The formulation according to claims 1 to 4 in form of an aqueous suspension concentrate (SC) and said non-ionic water- soluble mixed polyalkoxylated aliphatic alcoholsurfactant (a) is a multi-branched aliphatic Cs-is alcohol alkoxylated with ethoxy and propoxy groups wherein the ethoxy to propoxy ratio is from 50:50 to 90:10.

6. The formulation according to claim 5 wherein the non-ionic water-soluble mixed polyalkoxylated aliphatic alcohol surfactant (a) is a mixed random or block oligomer of formula II

H_2n+lC_n-0- (CH₂CH₂0) x (CH₂CH (CH₃ ) 0) _yH (II)

7. The formulation according to claim 1 to 6 in form of an aqueous suspension concentrate (SC) and said non-ionic water- soluble ethoxylated aliphatic alcohol surfactant (b) is an aliphatic Cχo-₂₅ alcohol ethoxylated with 10 to 25 ethoxy groups .

8. The formulation according to claim 1 to 7 comprising one or more multi-branched aliphatic Cβ-is alcohols alkoxylated with ethoxy and propoxy groups wherein the ethoxy to propoxy ratio is from 50:50 to 90:10, and additionally one or more aliphatic Cιo-₂₅ alcohols ethoxylated with 10 to 25 ethoxy groups .

. A kit for the preparation of a spray mixture consisting of two separate containers, a first container containing a composition which comprises at least one fungicidal compound of formula I according to claim 1, conventional adjuvants and carriers; and a second container containing a composition which comprises one or more adjuvants selected from the groups consisting of

a) non-ionic water-soluble mixed polyalkoxylated aliphatic alcohol surfactants,

b) non-ionic water soluble ethoxylated aliphatic alcohol surfactants,

c) amine ethoxylates, and

d) micronized polymeric waxes,

10. A method for the control of phytopathogenic fungi on plants characterized -by the use of fungicidal effective amount of a triazolopyrimidine compound of formula I accordning to claim 1.