Herbicidal composition and method of weed control

Plant protecting and regulating compositions – Plant growth regulating compositions – Plural active ingredients

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A01N 57100

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active

059654864

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BRIEF SUMMARY
The present invention relates to a novel herbicidal composition that contains a combination of herbicides suitable for selectively controlling weeds in crops of cultivated plants, typically in crops of cereals, rape, sugar beet, sugar cane, plantations, rice, cotton and, preferably, in crops of maize and soybean.
The invention further relates to a method of controlling weeds in crops of cultivated plants and to the use of said novel composition therefor. The compound of formula I ##STR4## has herbicidal action. This is disclosed, inter alia, in EP-A-0 273 417.
The following compounds of formulae II and III ##STR5## as well as their agriculturally acceptable salts, in particular the alkali metal salts, ammonium salts and amine salts, are also known as herbicides (glufosinate and glyphosate) and are described, inter alia, in "The Pesticide Manual", Tenth Edition 1994, Crop Protection Publications, and they are also commercially available.
Surprisingly, it has now been found that a combination of an active compound of formula I with one of the above herbicides of formula II and/or III, in a varying ratio, exerts a herbicidal effect that is able to control the majority of weeds occurring in particular in crops of cultivated plants preemergence as well as, preferably, postemergence without substantial injury to the cultivated plant.
Accordingly, the present invention provides a novel composition for selectively controlling weeds, which comprises, as active ingredient, a compound of formula I ##STR6## and a compound of formula II ##STR7## and/or of formula III ##STR8## or an agriculturally acceptable salt of the compound of formula II and/or III in admixture.
Suitable salt formers for the compounds of formulae II and III are amines, ammonium hydroxide as well as alkali metal hydroxides and alkaline earth metal hydroxides.
Illustrative examples of amines suitable for salt formation are primary, secondary and tertiary aliphatic and aromatic amines, typically methylamine, ethylamine, propylamine, isopropylamine, the four isomeric butylamines, dimethylamine, diethylamine, diethanol-amine, dipropylamine, diisopropylamine, di-n-butylamine, pyrrolidine, piperidine, morpholine, trimethylamine, triethylamine, tripropylamine, quinuclidine, pyridine, quinoline and isoquinoline, in particular ethylamine, propylamine, diethylamine or triethylamine, preferably isopropylamine and diethanolamine.
Typical examples of quaternary ammonium bases are generally the cations of halo-ammonium salts, typically the tetramethylammonium cation, trimethylbenzyl-ammonium cation, triethylbenzylammonium cation, tetraethylammonium cation, trimethylethyl-ammonium cation, and also the ammonium cation.
The novel herbicidal combination can be used against a great number of agriculturally important weeds in crops of cultivated plants, in particular in crops of maize and soybean, including Veronica, Galium, Papaver, Solanum, Chenopodium, Amaranthus, Xanthium, Abutilon, Ambrosia, Sagitaria, Ipomoea, Cassiastora, Datura stramonium, Sesbania exaltata and Sida spinosa.
The novel compositions are suitable for all standard methods of application used in agriculture, typically preemergence application, postemergence application, which is preferred, and seed dressing.
The novel herbicidal combination is preferably suitable for weed control in crops of cultivated plants, typically cereals, rape, sugar beet, sugar cane, plantations, rice, cotton and, preferably, maize and soybean.
Crops will be understood as meaning also those crops that have been made tolerant to herbicides or classes of herbicides by conventional breeding or genetic engineering methods, e.g. to glyphosate or glufosinate, in particular crops of soybean and maize tolerant to glyphosate and glufosinate.
Crops of cultivated plants which are tolerant to the components of formula II and/or III are preferably prepared by biotechnological methods. The methods for the preparation of such plants which are tolerant to the compounds of formula II and/or III are described in detail in the international ap

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