Ciba-geigy Corporation

Marco Quadranti

Willy Maurer

Andreas Zoschke

Kurt Maag

Wilhelm Schmidli

Hans-Rudolf Gerber

Wilheim Schmidli

The invention relates to a herbicidal composition containing as compound of formula I N-[2-(methoxycarbonyl)phenyl]sulfonyl-N'-(4,6-bis-difluoromethoxypyrimidin -2-yl)-urea together with a herbicide of formula III ##STR1## wherein the radicals R.sup.2 and R.sup.3 are as defined in the text, to a method for the selective control of weeds in crops of useful plants and to the use of these compositions for controlling weeds in crops of useful plants.

Synergistic composition and method for the selective control of weeds

Compositions that contain, in admixture with one another, as active ingredient, on the one hand N-[2-(2-methoxyethoxy)-phenylsulphonyl]-N'-(4,6-dimethoxy-1,3,5-triazin-2- yl)-urea of the formula ##STR1## and on the other hand one or two of the active ingredients of the formulae II, III, IV, V, VI, VII, VIII, IX, X, XI, XII, XIII, XIV and XV defined herein exhibit synergistic herbicidal action in rice.

Synergistic composition and method for selective weed control in rice

The invention provides a herbicidal composition for the post-emergence selective control of grasses and weeds in cereals, such as wheat and barley. The composition contains two active components, one of which is N-(3-trifluoromethyl-1,2,4-thiadiazolyl-5)-N'-methyl-N'-methoxy urea and the other is a dichloropyridyloxy-.alpha.-phenoxypropionic acid derivative of the formula ##STR1## The invention also provides a post-emergence method of selectively controlling grasses and weeds in crops of cereals, such as wheat and barley, which comprises the use of this composition. In particular wild oat species are selectively controlled.

Herbicidal compositions containing

The present invention relates to a preemergence method of selectively controlling weeds in crops of cereals, and to a composition therefor. Up to now it has been virtually impossible to use s-triazines, phenylureas and other photosynthesis inhibitors as preemergence herbicides in cereals, especially wheat and barley, because of their too potent action. This invention solves the problem by providing a composition for the preemergence control of weeds which, in addition to containing such photosensitive inhibitors, contains a diphenyl ether or pyridylphenyl ether derivative as antagonistic component which neutralizes or greatly diminishes the harmful action in cereals. In particular, the admixture of known nuclear-substituted phenoxyphenoxyalkanoic acid derivatives or pyridyl-(2)-oxy-phenoxyalkanoic acid derivatives to commercially available 4,6-bis-alkylamino-s-triazines and phenylureas can influence the herbicidal action of these latter so advantageously that, in preemergence application, they no longer damage cereals when employed in conventional concentrations, without losing their potent action against weeds.

Preemergence method of selectively controlling weeds in crops of cereals

The invention provides a herbicidal composition for the post-emergence selective control of grasses and weeds in cereals, such as wheat and barley. The composition contains two active components, one of which is N-(3-trifluoromethyl-1,2,4-thiadiazolyl-5)-N'-methyl-N'-methoxy urea and the other is a dichloropyridyloxy-.alpha.-phenoxypropionic acid derivative of the formula ##STR1## wherein X is oxygen or sulfur and R is hydrogen, a cation, a lower alkyl, alkenyl or alkynyl radical. The invention also provides a post-emergence method of selectively controlling grasses and weeds in crops of cereals, such as wheat and barley, which comprises the use of this composition. In particular wild oat species are selectively controlled.

Growing community of inventors

Brugg, Switzerland

Marco Quadranti