Plant protecting and regulating compositions – Plant growth regulating compositions – Plural active ingredients
Patent
1995-11-15
1998-06-30
Clardy, S. Mark
Plant protecting and regulating compositions
Plant growth regulating compositions
Plural active ingredients
A01N 4368, A01N 4370
Patent
active
057733872
DESCRIPTION:
BRIEF SUMMARY
This application has been filed under 35 USC 371 as the national stage application of PCT/RU93/00210, filed Sep. 2, 1993.
FIELD OF UTILITY
The instant application is related to agriculture, specifically to chemical agents for plant protection and eradication of undesired vegetation.
BACKGROUND OF THE INVENTION
Derivatives of sulfonylurea are known to possess herbicidal activity.
Specific action of all preparations of sulfonylurea series is related to inhibition of the early stage in amino acid biosynthesis by suppression of enzyme acetolactate synthetase (ALS) activity. A relationship between the herbicidal activity of sulfonylurea derivatives and their ability to inhibit ALS has been established.
The ALS in most of the higher plants is highly sensitive to herbicides of the sulfonylurea series. Nevertheless, the endurance of some plants to said compounds, pointing to unspecific sensitivity to ALS, is connected to inactivation or detoxication of the sulfonylurea derivative. These processes proceed at with different rates in various plants and that results both in high selectivity of herbicidal compositions towards various agricultural species and in resistance developed in weeds. The sulfonylurea derivatives of the instant invention are for use in cereals--e.g., corn, barley, rye and oats.
Most of the known derivatives of the sulfonylurea series are slowly decomposed in soil and overdosage of said herbicides results in detrimental effects in crop rotation as well as to serious phytotoxicity in certain agricultural species, e.g., corn, soybean etc.
All known herbicidal compositions based on sulfonylurea are wettable powders or microgranules. The absence of water-soluble preparations in this series is explainable by low water-solubility of sulfonylureas and their relatively high hydrolysis rate (C. Smith, Sulfonylurea herbicides, 1991, PJB Publication Ltd., pp. 51, 67, 99, and 107).
To counteract said shortcomings a herbicidal composition had to be developed with lower application dosage, wider activity spectrum on weeds and absence of phytotoxicity towards cultivated species.
A herbicidal composition with wide spectrum of activity has been disclosed (EP application #236273) consisting of two sulfonylureas A and B: ##STR1## with the addition of a surfactant, an organic solvent and water.
A method for the control of undesired vegetation using said herbicidal composition involves treating the vegetation or soil with said herbicidal composition in the form of an emulsion or suspension in dosage up to 3 kg/ha. The disclosed herbicidal composition displays undesirable phytotoxic effects on such crops as corn, soybean etc.
DETAILED DESCRIPTION OF THE INVENTION
The instant invention discloses a herbicidal composition, comprising a mixture of benzenesulfonylurea derivative (I) in the form of its ammonium salt ##STR2## with a benzenesulfonylurea derivative (II) In the form of its ammonium salt ##STR3## wherein R.sub.1 is hydrogen or methyl and R.sub.2 is chloro, methoxycarbonyl or 2-chloroethoxy; a surfactant, an organic solvent--triethyleneglycol and water In the following mass percentage:
______________________________________ compound of the formula (I)
1,5-30%
compound of the formula (II)
1,5-30%
surfactant 1,0-5,0%
triethyleneglycol 20-40%
water up to 100%
______________________________________
As a surfactant an agent selected from the following group is applicable: bis-polyoxyethylated alkylamine, sodium bis(2-ethylhexyl)succinate sulfonate, polyethyleneglycol monoalkyl ethers or alkylaryl ethers of polyethyleneglycol or polypropyleneglycol.
Compound I and its use are described in the following two publications, which are incorporated herein by reference in their entirety: published in the Official Russian Gazette ("Izobretenija i . . . ") on Dec. 23, 1992, No. 47/1992; and pages, published in 1995, wherein the compound and its preparation are described on pages 504-505 under the title "Chlorsulfoxim" (Krug).
The combination of the two sulfonylureas (I) and (II) in the form of their a
REFERENCES:
patent: 3013054 (1961-12-01), Richter
patent: 5223016 (1993-06-01), Takematsu et al.
Makeeva-guryanova et al., Sulfonilmochevinynovye perspektivnye gerbitsidy, obsornaya informatsia, 1989, gosagroprom SSR (Moscow) pp. 20-21, 48-55.
Mel'nikov et al., Khimicheskie sredstva zashchity rasterii', 1980, Khimiya, Moscow, p. 27.
Smith, Sulfonylurea herbicides, PJB Publications Ltd., pp. 51, 67, 99, and 107 (1991).
Clardy S. Mark
Labatt Brewing Company Limited
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