Chemistry: fertilizers – Processes and products – Forms or conditioning
Patent
1991-02-07
1992-09-22
Raymond, Richard L.
Chemistry: fertilizers
Processes and products
Forms or conditioning
71105, 71120, A01N 4340, A01N 4354, A01N 4730, A01N 3734
Patent
active
051493586
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a herbicidal product containing a synergistic combination of bromoxynil (I) or of one of its derivatives, and of 2-[[(4,6-dimethoxypyrimidin-2-yl) aminocarbonyl]amino-sulphonyl]-N,N-dimethyl-3-pyridinecarboxamide (II), which is remarkably suitable for the selective control of weeds in maize cultures. The invention likewise relates to the use of the novel product, optionally in the form of a composition by way of herbicide and to a method of controlling post-emergence weeds in maize cultures with the aid of the product or of the composition.
PRIOR ART
Bromoxynil or one of its derivatives is well known as a selective post-emergence broad-leaf herbicide in maize crops, in particular from the "Pesticide Manual", 8th edition. In contrast, this compound or one of its derivatives is little or not active against monocotyledon weeds.
Moreover, EP-A-232,067 and EP-A-237,292 disclose 2-[[(4,6-dimethoxypyrimidin-2-yl)aminocarbonyl]aminosulphonyl]-N,N-dimethy l-3-pyridinecarboxamide as herbicide, in particular selective post-emergence herbicide, in maize crops. These last two documents moreover mention that, in general, the N-pyrimidinyl-N-pyridinesulphonylureas can be combined with certain herbicides, inter alia bromoxynil. However, no combination of this type has been described.
European Patent Application No. 0,303,383 likewise mentions certain combinations with the herbicide described in EP-A-232,067, without giving any examples.
OBJECT OF THE INVENTION
Nevertheless, it is always desirable to improve the action of herbicidal active substances.
As far as the present invention is concerned, it proposes a novel combination which results from a limited choice from amongst a virtually infinite number of possibilities and which provides big advantages which will be better understood in the light of what will be described hereinafter.
In this way, it has been found in a completely unexpected manner, that the combination improved, in a noticeable and surprising fashion, the respective and isolated action of the two active substances for a certain number of weeds which are particularly harmful in crops, in particular maize, while preserving the selectivity towards the crops. From this follows an improvement of the activity spectrum and a possibility of reducing the respective dose of each active substance used, this latter quality being particularly important for ecological reasons which can be easily understood.
The combination therefore presents a remarkable degree of synergism as defined by PML Tammes, Netherlands Journal of Plant Pathology, 70 (1964) p. 7380 in an article with the title "Isoboles, une representation graphique de synergie dans les pesticides [Isoboles, a graphic representation of synergism in pesticides]", or as defined by Limpel, L. E., P. H. Schuldt and D. Lamont, 1962, Proc. NEWCC 16:48-53, using the formula: ##EQU1## where E is the expected percentage of growth inhibition of a mixture of the two herbicides at defined doses, X is the observed percentage of growth inhibition of herbicide A at a defined dose, Y is the observed percentage of growth inhibition of herbicide B at a defined dose. If the observed percentage of inhibition of the combination is greater than E, synergism is present.
In particular, the combination which is the object of the present invention has proven particularly effective for controlling:
THE PRODUCT ACCORDING TO THE INVENTION
The invention primarily relates to a product which contains a synergistic combination of bromoxynil or of one of these derivatives (I) and of 2-[[4,6-dimethoxypyrimidin-2-yl) aminocarbonyl]aminosulphonyl]-N,N-dimethyl-3-pyridinecarboxamide (II).
As far as bromoxynil or one of its derivatives is concerned, compounds which will be used in particular are those of formula: ##STR2## in which:
R is a hydrogen atom or a potassium or sodium atom or a CO-C.sub.2 -C.sub.10 alkyl radical, preferably bromoxynil butanoate or heptanoate or octanoate.
The compound is preferably bromoxynil octanoate or heptanoate, or a mixture o
REFERENCES:
patent: 4786734 (1988-11-01), Hanagan
The Agrochemicals Handbook, 2nd ed. "Bromaxymil". Aug. 1987.
Clardy S. Mark
Raymond Richard L.
Rhone-Poulenc Agrochimie
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