EP1729577A1

EP1729577A1 - Fungicidal mixtures for controlling rice pathogens

Info

Publication number: EP1729577A1
Application number: EP04797970A
Authority: EP
Inventors: Jordi Tormo I Blasco; Thomas Grote; Maria Scherer; Reinhard Stierl; Siegfried Strathmann; Ulrich Schöfl
Original assignee: BASF SE
Current assignee: BASF SE
Priority date: 2003-11-27
Filing date: 2004-11-18
Publication date: 2006-12-13
Also published as: CO5680378A2; AU2004304676A1; WO2005060752A1; NO20062478L; KR20060113928A; JP2007513085A; CA2545288A1; AR046722A1; US20070202192A1; TW200530240A; IL175394A0; EA200600966A1; BRPI0416939A

Abstract

The invention relates to fungicidal mixtures for controlling rice pathogens, which comprise as the active components 1) the triazolopyrimidine derivative of formula (I) and 2) phosphorous acid H3PO3, the alkali or alkaline earth salts thereof or derivatives releasing the same in a synergistically effective amount. The invention also relates to a method for controlling parasitic fungi using mixtures of compound I with compound II and to the use of compound I with compound II for producing the aforementioned mixtures, and to agents that contain said mixtures.

Description

FUNGICIDAL MIXTURES FOR CONTROLLING RICE PATHOGENES

description

The present invention relates to fungicidal mixtures containing as active components

1) the triazolopyrimidine derivative of the formula I,

and

2) Phosphorous acid H ₃ PO ₃ , its alkali or alkaline earth salts or derivatives II releasing them

in a synergistically effective amount.

The invention also relates to a method for controlling harmful fungi with mixtures of the compound I with the compound II and the use of the compound I with the compound II for the production of such mixtures and agents which contain these mixtures.

The compound I, 5-chloro-7- (4-methyl-piperidin-1-yl) -6- (2,4,6-trifluorophenyl) - [1,2 _> 4] tri-azolo [1,5 -a] pyrimidine, its preparation and its action against harmful fungi is known from the literature (WO 98/46607).

Mixtures of triazolopyrimidine derivatives with other active ingredients are generally known from EP-A 988790 and US 6268 371.

The synergistic mixtures described in EP-A 988790 are described as fungicidally active against various diseases of cereals, fruits and vegetables, in particular mildew on wheat and barley or gray mold on apples. The mixtures known from US Pat. No. 6,268,371 are described as being particularly advantageous against rice diseases. Phosphorous acid is the actually effective breakdown product of the long-established active ingredients ethylphosphonate (common name: fosethyl) lla and ethylphosphonate aluminum salt (common name: fosethyl aluminum) Mb. OO CH ₃ CH ₂ OP-OH Ma CH ₃ CH ₂ OP-OH x Al / ₃ llb HH The preparation and the fungicidal action of the ester 11a and the corresponding aluminum salt llb is known from the literature (FR 22 54 276).

In view of an effective control of harmful fungi with the lowest possible application rates, the present invention was based on the problem of mixtures which, with a reduced total amount of active compounds applied, have an improved activity against harmful fungi (synergistic mixtures).

Accordingly, the mixtures defined at the outset were found. It has also been found that, when the compound I and the compound II are used simultaneously or separately or when the compound I and the compound II are used in succession, harmful fungi can be better controlled than with the individual compounds.

The mixtures of the compound I and the compound II or the simultaneous joint or separate use of the compound I and the compound II are notable for excellent activity against a broad spectrum of phytopathogenic fungi, in particular from the class of the Ascomycetes. Deuteromyces, Oomycetes and Basidiomycetes. They can be used in plant protection as leaf and soil fungicides.

They are particularly important for combating a large number of fungi on various crops such as bananas, cotton, vegetables (e.g. cucumbers, beans and squashes), barley, grass, oats, coffee, potatoes, corn, fruit plants, rice, rye, soybeans, tomatoes , Wine, wheat, ornamental plants, sugar cane and a variety of seeds.

They are particularly suitable for combating the following phytopathogenic fungi: Blumeria graminis (powdery mildew) on cereals, Erysiphe cichoracearum and Sphaerotheca fuliginea on pumpkin plants, Podosphaera leucotricha on apples, Uncino- nula necator on vines, Puccinia Aύen on cereals, Cotton, rice and lawn, Ustilago seeds on cereals and sugar cane, Venturia inaequalis on apples, Bipolaris and Drechslera acts on cereals, rice and lawn, Septoria nodumum on wheat, Botrytis cinerea on strawberries, vegetables, ornamental plants and vines, my- cosphaerella seeds on bananas, peanuts and cereals, Pseudocercosporella her- potrichoides on wheat and barley, Pyricularia oryzae on rice, Phytophthora infestans on potatoes and hops, Pseudoperonospora species on squashes and hops, Plasmopara viticola on vines, Alternaria Aύ Fruit and Fusaria and Verticillium species.

The mixtures according to the invention are of particular importance for controlling harmful fungi on rice plants and on their seeds, such as bipolaris and woodturners, and also Pyricularia oryzae. They are particularly suitable for combating the rice brown spot disease caused by Cochliobolus miyabeanus.

Other pathogens are typical in rice than in cereals or fruit. Pyricularia oryzae and Corticium sasakii (syn. Rhizoctonia solani) are the causative agents of the most important diseases of rice plants. Rhizoctonia solani is the only agronomically important pathogen within the Agaricomycetidae subclass. This fungus does not attack the plant via spores like most other fungi, but via a mycelial infection.

The mixtures according to the invention can also be used in material protection (e.g. Holzschütz), for example against Paecilomyces variotii.

When preparing the mixtures, preference is given to using the pure active ingredients I and II, to which, as required, further active ingredients can be added to protect against harmful fungi or other pests such as insects, arachnids or nematodes, or else herbicidal or growth-regulating active ingredients or fertilizers.

In particular, active substances selected from the following groups are possible as further active substances in the above sense:

Acylalanines such as benalaxyl, metalaxyl, ofurace, oxadixyl,

Amine derivatives such as aldimorph, dodemorph, fenpropimorph, fenpropidin, guazatine, iminoctadine, tridemorph,

Anilinopyrimidines such as pyrimethanil, mepanipyrim or cyprodinil,

Antibiotics such as cycloheximide, griseofulvin, kasugamycin, natamycin, polyoxin or streptomycin,

Azoles such as bitertanol, bromoconazole, cyproconazole, difenoconazole, dinitroconazole, enilconazole, epoxiconazole, fenbuconazole, fluquiconazole, flusilazole, flutriafol, hexaconazole, imazalil, ipconazole, metconazol, penocolazolol, myocazolol, myocazolol, myclazol, myclazol, myclazol, myocazolol, myclazol, myclazol, myclazol, myclazol, myclazol , Tetraconazole, tri-dimefon, triadimenol, triflumizole, triticonazole, Dicarboximides such as myclozolin,

Dithiocarbamates such as Ferbam, Nabam, Maneb, Mancozeb, Metam, Metiram, Propineb, Polycarbamat, Thiram, Ziram, Zineb,

• Heterocyclic compounds such as anilazine, benomyl, boscalid, carbendazim, carboxin, oxycarboxin, cyazofamid, dazomet, dithianon, famoxadone, fenamidon, fenarimol, fuberidazole, flutolanil, furametpyr, isoprothiolan, pyro, quinofonilonyl, quinolonolin, nuarolinolinolinolinolinolinolinolinolinolinolinolinolinolinolinolinolinolinolinolinolinolinolinolonylolonylolonylolonylolonylolateolate Thiabendazole, thifluzamide, tiaminil, tricyclazole, triforins,

Nitrophenyl derivatives, such as binapacryl, dinocap, dinobutone, nitrophthal-isopropyl, phenylpyrroles such as fenpiclonil or fludioxonil,

• sulfur,

• Other fungicides such as acibenzolar-S-methyl, carpropamide, chlorothalonil, cyflufamid, cymoxanil, Dazomet, diclomezin, diclocymet, diethofencarb, edifenphos, ethaboxam, fenhexamide, fentin acetate, fenoxanil, ferimzone, etylylam, fosamyl, fosamyl Aluminum, iprovalicarb, hexachlorobenzene, metrafenone, methyl isothiocyanate, pencycuron, propamocarb, phthalide, toloclofos-methyl, quintozene, zoxamide,

Strobilurins such as azoxystrobin, dimoxystrobin, fluoxastrobin, kresoxim-methyl, metominostrobin, orysastrobin, pyraclostrobin or trifloxystrobin, sulfenic acid derivatives such as captafol, captan, diclofluanide, folpet,

• Cinnamic acid amides and analogues such as dimethomorph, flumetover or flumorph.

In one embodiment of the mixtures according to the invention, a further fungicide III or two fungicides III and IV as mentioned above are admixed to the compounds I and II.

Mixtures in which captafol, captan, diclofluanide, folpet, maneb, mancozeb, metiram, thiram or zineb are present as active ingredient III are particularly preferred.

Mixtures containing the compounds I and II, in particular IIb, are preferred which, if desired, can contain a component III.

The compound I and the compound II can be applied simultaneously together or separately or in succession, the sequence in the case of separate application generally not having any effect on the success of the control.

The compound I and the compound II are usually used in a weight ratio of 100: 1 to 1: 100, preferably 10: 1 to 1:20, in particular 5: 1 to 1:10. The aforementioned ratios and the following information relate in particular to the compound I and fosethyl aluminum llb. Using Phosphorous acid II, its alkali metal or alkaline earth metal salts or fosethyl IIa can be used to correspondingly reduce the amounts of component (2) in accordance with the lower molecular weight.

Depending on the type of compound and the desired effect, the application rates of the mixtures according to the invention are 5 g / ha to 2500 g / ha, preferably 50 to 2000 g / ha, in particular 50 to 1000 g / ha.

The application rates for the compound I are accordingly generally from 1 to 1000 g / ha, preferably from 10 to 900 g / ha, in particular from 20 to 750 g / ha.

The application rates for the compound IIb are accordingly generally from 1 to 2500 g / ha, preferably 10 to 1000 g / ha, in particular 20 to 750 g / ha.

In the case of seed treatment, application rates of mixture of 1 to 1000 g / 100 kg of seed, preferably 1 to 200 g / 100 kg, in particular 5 to 100 g / 100 kg, are generally used.

If pathogenic harmful fungi are to be combated for plants, the separate or joint application of the compound I and the compound II or the mixtures of the compound I and the compound II is carried out by spraying or dusting the seeds, the plants or the soil before or after sowing of the plants or before or after emergence of the plants. The compounds are preferably used by spraying the leaves.

The mixtures according to the invention, or the compounds I and II, can be converted into the customary formulations, e.g. Solutions, emulsions, suspensions, dusts, powders, pastes and granules. The form of application depends on the respective purpose; in any case, it should ensure a fine and uniform distribution of the compound according to the invention.

The formulations are prepared in a known manner, for example by stretching the active ingredient with solvents and / or carriers, if desired using emulsifiers and dispersants. The following are essentially suitable as solvents / auxiliaries: water, aromatic solvents (for example Solvesso products, xylene), paraffins (for example petroleum fractions), alcohols (for example methanol, butanol, pentanol, benzyl alcohol), ketones (for example cyclohexanone, gamma Butryolactone), pyrrolidones (NMP, NOP), acetates (glycol diacetate), glycols, dimethyl fatty acid amides, fatty acids and fatty acid esters. In principle, solvent mixtures can also be used Carriers such as natural stone powder (eg kaolins, clays, talc, chalk) and synthetic stone powder (eg highly disperse silica, silicates); Emulsifiers such as nonionic and anionic emulsifiers (eg polyoxyethylene fatty alcohol ethers, alkyl sulfonates and aryl sulfonates) and dispersants such as lignin sulfite waste liquors and methyl cellulose.

Suitable surfactants are alkali metal, alkaline earth metal salts, sulfonic acid ammonium salts of lignosulfonic acid, naphthalenesulfonic acid, phenolsulfonic acid, dibutylnaphthalenesulfonic acid, alkylarylsulfonates, alkyl sulfates, alkylsulfonates, fatty alcohol sulfates, fatty acids and suϊfa- oriented fatty alcohol glycol ethers, furthermore condensates of sulfonated naphthalene and naphthalene derivatives with formaldehyde , Condensation products of naphthalene or of naphthalene sulfonic acid with phenol and formaldehyde, polyoxyethylene octylphenol ether, ethoxylated isooctylphenol, octylphenol, nonylphenol, alkylphenol polyglycol ether, tri-butylphenyl polyglycol ether, trihylphenyl polyglycol ether, alkyl alcoholoxy ethoxylated alcohol, alkyl alcoholoxy ethoxylated alcohol , Laurylalkoholpolyglykoletheracetal, sorbitol ester, lignin sulfite waste liquors and methyl cellulose into consideration.

For the production of directly sprayable solutions, emulsions, pastes or oil dispersions, mineral oil fractions from medium to high boiling points, such as kerosene or diesel oil, furthermore coal tar oils as well as oils of vegetable or animal origin, aliphatic, cyclic and aromatic hydrocarbons, e.g. Toluene, xylene, paraffin, tetrahydronaphthalene, alkylated naphthalenes or their derivatives, methanol, ethanol, propanol, butanol, cyclohexanol, cyclohexanone, isophorone, strongly polar solvents, e.g. Dimethyl sulfoxide, N-methylpyrrolidone or water into consideration.

Powders, materials for broadcasting and dusts can be prepared by mixing or grinding the active substances together with a solid carrier.

Granules, e.g. Coating, impregnation and homogeneous granules can be produced by binding the active ingredients to solid carriers. Solid carriers are e.g. Mineral earths, such as silica gels, silicates, talc, kaolin, attack clay, limestone, lime, chalk, bolus, loess, clay, dolomite, diatomaceous earth, calcium and magnesium sulfate, magnesium oxide, ground plastics, fertilizers, e.g. Ammonium sulfate, ammonium phosphate, ammonium nitrate, ureas and vegetable products such as cereal flour, tree bark, wood and nutshell flour, cellulose powder and other solid carriers.

The formulations generally contain between 0.01 and 95% by weight, preferably between 0.1 and 90% by weight, of the active ingredients. The active ingredients are ner purity of 90% to 100%, preferably 95% to 100% (according to the NMR spectrum).

Examples of formulations are: 1. Products for dilution in water

A) Water-soluble concentrates (SL)

10 parts by weight of the active ingredients are dissolved in water or a water-soluble solvent. Alternatively, wetting agents or other aids are added. The active ingredient dissolves when diluted in water.

B) Dispersible concentrates (DC)

20 parts by weight of the active ingredients are dissolved in cyclohexanone with the addition of a dispersant e.g. Dissolved polyvinyl pyrrolidone. When diluted in water, a dispersion results.

C) Emulsifiable concentrates (EC)

15 parts by weight of the active ingredients are dissolved in xylene with the addition of calcium dodecylbenzenesulfonate and castor oil ethoxylate (5% each). Dilution in water results in an emulsion.

D) Emulsions (EW, EO)

40 parts by weight of the active ingredients are dissolved in xylene with the addition of calcium dodecylbenzenesulfonate and castor oil ethoxylate (5% each). This mixture is introduced into water using an emulsifying machine (Ultraturax) and brought to a homogeneous emulsion. Dilution in water results in an emulsion.

E) suspensions (SC, OD)

20 parts by weight of the active ingredients are comminuted in a stirred ball mill to form a fine active ingredient suspension with the addition of dispersing and wetting agents and water or an organic solvent. Dilution in water results in a stable suspension of the active ingredient.

F) Water-dispersible and water-soluble granules (WG, SG)

50 parts by weight of the active ingredients are finely ground with the addition of dispersing and wetting agents and produced using technical equipment (e.g. extrusion, spray tower, fluidized bed) as water-dispersible or water-soluble granules. Dilution in water results in a stable dispersion or solution of the active ingredient.

G) Water-dispersible and water-soluble powders (WP, SP) 75 parts by weight of the active ingredients are added with the addition of dispersing and wetting agents. grind like silica gel in a rotor-strator mill. Dilution in water results in a stable dispersion or solution of the active ingredient.

2. Products for direct application

H) dusts (DP)

5 parts by weight of the active ingredients are finely ground and intimately mixed with 95% finely divided kaolin. This gives a dust.

I) Granules (GR, FG, GG, MG)

0.5 part by weight of the active ingredients are finely ground and combined with 95.5% carriers. Common processes are extrusion, spray drying or fluidized bed. This gives granules for direct application.

J) ULV solutions (UL)

10 parts by weight of the active ingredients are dissolved in an organic solvent e.g. Xylene dissolved. This gives you a product for direct application.

The active ingredients as such, in the form of their formulations or the use forms prepared therefrom, e.g. in the form of directly sprayable solutions, powders, suspensions or dispersions, emulsions, oil dispersions, pastes, dusts, sprinkling agents, granules by spraying, atomizing, dusting, scattering or pouring. The application forms depend entirely on the purposes; in any case, they should ensure the finest possible distribution of the active compounds according to the invention.

Aqueous application forms can be prepared from emulsion concentrates, pastes or wettable powders (wettable powders, oil dispersions) by adding water. To prepare emulsions, pastes or oil dispersions, the substances as such or dissolved in an oil or solvent can be homogenized in water by means of wetting agents, adhesives, dispersants or emulsifiers. However, it is also possible to prepare concentrates composed of an active substance, wetting agents, adhesives, dispersants or emulsifiers and possibly solvents or oil, which are suitable for dilution with water.

The active ingredient concentrations in the ready-to-use preparations can be varied over a wide range. In general, they are between 0.0001 and 10%, preferably between 0.01 and 1%. The active ingredients can also be used with great success in the ultra-low-volume process (ULV), it being possible to apply formulations with more than 95% by weight of active ingredient or even the active ingredient without additives.

Oils of various types, wetting agents, adjuvants, herbicides, fungicides, other pesticides, bactericides can be added to the active compounds, if appropriate also only immediately before use (tank mix). These agents are usually added to the agents according to the invention in a weight ratio of 1:10 to 10: 1.

The compounds I and II, or the mixtures or the corresponding formulations, are used in that the harmful fungi, the plants, seeds, soils, areas, materials or spaces to be kept free from them are mixed with a fungicidally effective amount of the mixture or the compounds I and II when applied separately. The application can take place before or after the infestation by the harmful fungi.

The fungicidal activity of the compound and the mixtures can be demonstrated by the following tests:

The active ingredients were prepared separately or together as a stock solution with 0.25% by weight of active ingredient in acetone or DMSO. 1% by weight of Uniperol® EL emulsifier (wetting agent with emulsifying and dispersing action based on ethoxylated alkylphenols) was added to this solution and diluted with water to the desired concentration.

Example of use - effectiveness against brown spot disease of rice caused by Cochliobolus miyabeanus with protective treatment

Leaves of potted rice seedlings of the "Tai-Nong 67" variety were sprayed to runoff point with an aqueous suspension in the active compound concentration given below. The following day, the plants were inoculated with an aqueous spore suspension of Cochliobolus miyabeanus. The test plants were then placed in climatic chambers at 22-24 ° C and 95-99% relative humidity for 6 days. The extent of the development of the infestation on the leaves was then determined visually.

The evaluation is carried out by determining the affected leaf areas in percent. These percentages were converted into efficiencies. Efficiency (W) is calculated using Abbot's formula as follows:

W = (1 - σ / #) - 100

α corresponds to the fungal attack of the treated plants in% and ß corresponds to the fungal attack of the untreated (control) plants in%

With an efficiency of 0, the infection of the treated plants corresponds to that of the untreated control plants; with an efficiency of 100, the treated plants show no infection.

The expected efficacies of the active ingredient mixtures are calculated according to the Colby formula [R.S. Colby, Weeds 15, 20-22 (1967)] and compared with the observed efficiencies. Colby formula: E = x + y - x-y / 100

E expected efficiency, expressed in% of the untreated control, when using the mixture of active ingredients A and B in concentrations a and bx the efficiency, expressed in% of the untreated control, when using active ingredient A in concentration ay, the efficiency, expressed in% of the untreated control when using the active ingredient B in the concentration b

Table A - Individual substances

Drug mixture observed calculated

Example Concentration Efficiency Efficiency *) Mixing ratio l + llb 5 4 + 16 ppm 89 33 1: 4

*) Efficiency calculated according to the Colby formula

The results of the experiments show that the observed efficiency in all mixing ratios is higher than calculated using the Colby formula.

Claims

claims

1. Fungicidal mixtures containing

1) the triazolopyrimidine derivative of the formula I,

and

2) Phosphorous acid H ₃ PO ₃ , its alkali or alkaline earth salts or derivatives II releasing them in a synergistically effective amount.

2. Fungicidal mixtures according to claim 1, containing as compound II Fosethyl aluminum of the formula IIb O CH ₃ CH ₂ OP-OH x AI / ₃ Mb H

3. Fungicidal mixtures according to one of claims 1 or 2, containing the compound of formula I and the compound of formula II in a weight ratio of 100: 1 to 1: 100.

4. Agent containing a liquid or solid carrier and a mixture according to one of claims 1 to 3.

5. A method for controlling harmful fungi, characterized in that the fungi, their habitat or the plants to be protected against fungal attack, the soil or seeds are treated with an effective amount of the compound I and the compound II according to claim 1.

6. The method according to claim 5, characterized in that the compounds I and II according to claim 1 are applied simultaneously, that is jointly or separately, or in succession.

7. The method according to claims 5 and 6, characterized in that rice pathogenic harmful fungi are combated.

8. The method according to claim 5 to 7, characterized in that the mixture according to one of claims 1 to 3 is used in an amount of 5 g / ha to 2500 g / ha.

9. The method according to claims 5 to 7, characterized in that the mixture according to one of claims 1 to 3 is used in an amount of 1 to 1000 g / 100 kg of seed.

10. Seed containing the mixture according to claims 1 to 3 in an amount of 1 to 1000 g / 100 kg.

11. Use of the compound I and the compound II according to claim 1 for the preparation of an agent suitable for combating harmful fungi.