Synergistic fungicidal composition comprising a compound analogo

Drug – bio-affecting and body treating compositions – Designated organic active ingredient containing – Having -c- – wherein x is chalcogen – bonded directly to...

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514391, A01N 4350, A01N 4354

Patent

active

060573317

DESCRIPTION:

BRIEF SUMMARY
The subject of the present invention is a synergistic fungicidal composition comprising a compound analogous to strobilurin and a process which makes use of the said composition and which is intended for the curative or preventive protection of crops against fungal attacks.
Compounds analogous to strobilurin with a fungicidal effect are known, in particular from European Patent Application EP 253213 or 398692 or from International Application WO 9208703, which make it possible to prevent the growth and the development of phytopathogenic fungi capable of attacking crops.
However, it is always desirable to improve the spectrum of activity and the effectiveness of such compounds with a fungicidal effect or to reinforce them by combining them with other molecules in order to obtain a more effective product or alternatively to prevent the appearance of fungal strains which are resistant to these new fungicides.
It is also highly desirable to have available fungicidal products which enjoy an improved persistence of effect, likely to space out in time the number of plant-protection treatments necessary for satisfactory control of the parasites.
It is, in any event, particularly advantageous to be able to decrease the amount of chemicals distributed in the environment, while ensuring high-performance protection of crops against fungal attacks.
It has now been found that one (or a number) of the above objectives could be achieved by virtue of the fungicidal composition according to the present invention.
The subject of the present invention is therefore a synergistic fungicidal composition comprising at least one compound A of formula (I): ##STR2## in which: A is the nitrogen atom or the --CH group, --CH.dbd.N--O--CH(CH.sub.3)-- group or the group of formula (II): ##STR3## R.sub.1 is an alkyl group containing 1 to 4 carbon atoms, preferably the methyl group, containing 1 to 4 carbon atoms, preferably the methyl or trifluoromethyl group, different X groups, dicarboximide derivatives, such as iprodione, procymidone and vinchlozolin, weight of between 0.02 and 5, preferably between 0.0625 and 1.33, is the group of formula (II).


BRIEF DESCRIPTION OF THE DRAWING

The sole FIGURE of Drawing, FIG. 1, is an isobole plot for ICIA 5504, i.e. methyl (E)-2-{2-[6-(2-cyanophenoxy)pyrimidin-4-yloxy]phenyl}-3-methoxyacrylate, and iprodione in radish seedlings against Alternaria brassicae (alternaria disease).
It is clearly understood that the said fungicidal composition can contain a single compound B or more than one such compound, for example 1, 2 or 3 compounds B, according to the use for which the combination is intended. Likewise, the composition may comprise more than one compound A.
Preference is given to the fungicidal composition according to the invention in which the compound A is methyl (E)-2-{2-[6-(2-cyanophenoxy)pyrimidin-4-yloxy]phenyl}-3-methoxyacrylate, methyl (E)-methoxyimino[.alpha.-(o-tolyloxy)-o-tolyl]acetate or N-methyl-(E)-methoxyimino[2-(2,5-dimethylphenoxymethyl)phenyl]acetamide.
Preference is further given, among the more especially preferred meanings of the compound B defined above, to iprodione. In an entirely unexpected way, the composition according to the invention significantly improves the effect of the active materials taken separately with respect to a certain number of fungi which are particularly harmful to crops, for example in particular grapes or the Solanaceae. This improvement is reflected in particular by a decrease in the doses of each of the constituents, which is particularly advantageous for the user and the environment. The fungicidal product thus exhibits synergistic properties attested by application of the Tammes method, "Isoboles, a graphic representation of synergism in pesticides", Netherlands Journal of Plant Pathology, 70(1964), p. 73-80 or as defined by Limpel, L. E., P. H. Schuldt and D. Lammont, 1962, Proc. NEWCC 16:48-53, using the following formula, also called Colby's formula:
in which: mixture of the two fungicides A and B at defined doses, equal to a and b respectiv

REFERENCES:
patent: Re33989 (1992-07-01), Wenderoth et al.
patent: 4829085 (1989-05-01), Wenderoth et al.
Research Disclosure, vol. 338, No. 33893, pp. 506-510 (1992).
Research Disclosure, vol. 348, No. 34874, pp. 267-268 (1993).
Tammes, Neth. J. Plant Path., 70, pp. 73-80 (1964).
Limpel et al, Proc. NEWCC, 16, pp. 48-53 (1962).
The Pesticide Manual, ed. Clive Tomlin, The British Crop Protection Council, 10.sup.th edition, pp. 68, 579, 603-604, 834-835, 1041-1042 (1994).

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