FR2599942A1 - PROCESS FOR COMBATTING FUNGAL DISEASES OF PLANTS USING A COMPOSITION BASED ON PROCHLORAZ AND TRIAZOLE. - Google Patents

Abstract

THE SUBJECT OF THE INVENTION IS A PROCESS FOR COMBATTING FUNGAL DISEASES OF PLANTS WHICH CONSISTS OF APPLYING ON PLANTS: A) THE COMPOUND OF FORMULA I (CF DRAWING IN BOPI) AND B) THE COMPOUND OF FORMULA II (CF DRAWING IN BOPI) IN A FUNGICIDE EFFECTIVE QUANTITY.

Description

The subject of the present invention is a method for combating

  fungal diseases of plants as well as compositions

  fungicides for use in this process.

  According to a first aspect, the invention relates to a method for combating fungal diseases of plants by means of a) the compound of formula I

OH N

Cl- (-CH-CH-3) I

3

  hereinafter referred to as compound A, and b) of the compound of formula II

/NOT

Cl-O-CH 2 -CH 2 -N-CO-N II

1 5H2-CH3

  hereinafter referred to as "prochloraz".

  Compound A is a known fungicide for effectively controlling fungi in crops such as cereals, including rice, especially wheat and barley. It is extremely effective against rust (such as Puccinia spp.) And has good activity against oidiums (such as Erysiphe), Septoria and Rhizoc25 tonia. Prochloraz is a known fungicide with good activity against Pseudocercosporella, Septoria, Pyrenophora, Oidiums

and Pyricularia.

  It has now been found that the use of prochloraz in combination with compound A makes it possible, surprisingly, to effectively control phytopathogenic fungi. This combination is particularly suitable for use throughout the vegetative period against vietins, foliar diseases and ear diseases, especially

the cereals.

  The present invention therefore relates to an improved method for combating plant fungal diseases, in particular cereals (including rice), in which process, particularly for wheat and barley, the compound is applied to the plants. A and prochloraz, as a mixture or separately, in a fungicidally effective amount. The process is extremely

  well tolerated by plants. A greater effect is observed than that resulting from the simple addition of the effects obtained with each of the constituents taken separately, inter alia against Septoria in wheat and against Helminthosporium in barley.

  Suitably, compound A will be used at a dose in the range of 50 to 100 g, in particular 60 to 80 g per hectare and prochloraz at a dose of 250 to 500 g, in particular 300 g.

  450 g per hectare of culture. The weight ratio of compound A to prochloraz is preferably from 1: 2 to 1: 8, more preferably from 1: 3.5 to 1: 8, especially from 1: 3.75 to 1: 6.

  An appropriate weight ratio is for example 1: 3.75, 1: 5 and 1: 7.5. The compounds are preferably applied by spraying, generally using an application volume of between 0.05 and 0.5 hl per hectare, for example between 0.05 to 0.1 hl for aerial application and between 0.degree. 2 and 0.4 hl for one application

classical earth.

  According to another aspect, the invention also relates to a

  fungicidal composition comprising compound A and prochloraz, preferably in the weight ratio defined above.

  The composition of the invention may be formulated in any conventional form, for example in the form of a twin package, or in the form of emulsifiable concentrates, wettable powders or granules for dissolving in water, preferably in the form of emulsifiable concentrates. Such formulations can be prepared according to known methods, for example by mixing compound A and prochloraz with appropriate adjuvants such as

  diluents, and optionally with other formulation ingredients such as surfactants.

  By diluent is meant in this patent application any agriculturally acceptable solid or liquid material - including fillers - which may be added to the active ingredients to facilitate or improve their application, or respectively to give them a usable activity. or desirable. It may be for example talc, kaolin, diatomaceous earth,

xylene or water.

  In particular, formulations intended to be applied by spraying, such as concentrated suspensions or wettable powders, may contain surfactants such as wetting agents and dispersing agents, for example the condensation product of formaldehyde with a naphthalenesulphonate. an alkylarylsulfonate, a lignin sulfonate, a fatty alcohol sulfate, an ethoxylated alkylphenol and an ethoxylated fatty alcohol. Generally, the formulations contain from 0.01 to 90% by weight of active ingredient, from 0 to 20% of an agriculturally acceptable surfactant and from 10 to 99.99% of one or more solid adjuvants. or liquids, the active ingredient consisting of

  compound A, prochloraz and possibly other active materials.

  The concentrated forms generally contain between about 2 and 80%, preferably between about 5 and 70% by weight of active ingredient. Ready-to-use shapes may contain by

  example between 0.01 and 45% by weight of active ingredient.

  The following examples illustrate the present invention

  without in any way limiting its scope. In these examples, parts and percentages are by weight.

  - 4 Emulsifiable concentrates Composition A B Compound A techn., (95.5%) 6, 2 8,2 Prochloraz techn. (97.4%) 29.7 29.7 Emulsifier 1 15.0 15.0 Solvent 2 49.1 47.1 Total 100 100 (1) for example a mixture consisting of 7 parts of a mixture of 10 ethoxylated triglycerides and calcium alkylarylsulfonate

  branched in iso-butanol and 8 parts of polyglycolic ether tributylphenol.

  (2) for example, a mixture of 15 parts of propylene glycol monomethyl ether and 34.1 parts (for A) or 32.1 parts (for composition B) of xylene.

Claims (9)

  1. A method for controlling fungal diseases of plants, characterized in that the compounds of formula I are applied to the plants separately or in a mixture. / COH = Cl- C-H-CH.-N C I AT   and b) the compound of formula II ## STR2 ## 2 2 3 2H2 H2_CH3   in a fungicidally effective amount.   2. A process according to claim 1, characterized in that the compound of formula I is applied at a dose of the order of 50 to 100 g and the compound of formula II at a dose of about 250 h. 500 g per hectare of culture.   3. A process according to claim 1, characterized in that the compound of formula I is applied at a dose of the order of 60 to 80 g and the compound of formula II at a dose of about 300 at 450 g, per hectare of culture.   4. A process according to any one of claims 1   at 3, characterized in that the plants to be treated are cereals. 5. A process according to claim 4, characterized in that   that the cereal to be treated is wheat.   6. A process according to claim 5, characterized in that   that it can fight Septoria in wheat.   7. A method according to claim 4, characterized in that the cereal to be treated is barley.   8. A process according to claim 7, characterized in that   it helps to fight Helminthosporium in barley.   9. A fungicidal composition, characterized in that   comprises the compound of formula I and the compound of formula II as claimed in claim 1 and a diluent.   10. A fungicidal composition according to claim 9, characterized in that the weight ratio of the compound of formula I   the compound of formula II is from 1: 2 to 1: 8.   11. A fungicidal composition according to claim 10, characterized in that the weight ratio of the compound of formula I   the compound of formula II is from 1: 3.75 to 1: 6.