Plant protecting and regulating compositions – Plant growth regulating compositions – Plural active ingredients
Patent
1997-11-03
1999-07-27
Robinson, Allen J.
Plant protecting and regulating compositions
Plant growth regulating compositions
Plural active ingredients
504127, 504133, A01N 5700, A01N 4364
Patent
active
059289953
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to mixtures of herbicides that have a synergistic effect on weeds and which are safe to crop plants.
BACKGROUND OF THE INVENTION
The control of undesired vegetation is extremely important in achieving high crop efficiency. Achievement of selective control of the growth of weeds especially in such useful crops as rice, soybeans, sugar beets, corn, potatoes, wheat, barley, tomatoes and plantation crops among others is very desirable. Unchecked weed growth in such useful crops can cause significant reduction in productivity and thereby result in increased costs to the consumers. The control of undesired vegetation in noncrop areas is also important. The need for finding products that achieve such results continues to be commercially important.
U.S. Pat. No. 5,090,993 discloses triflusulfuron methyl and describes its utility for selective weed control in sugar beets. U.S. Pat. Nos. 4,315,765 and 4,405,531 disclose herbicidal salts of glyphosate. WIPO publications WO 92/00377, WO 92/04449, WO 92/06201 and WO 92/19719 and U.S. Pat. Nos. 4,940,835, 4,971,908, 5,188,642 and 5,310,667 disclose methods for genetically transforming sugar beets to make them resistant to glyphosate. None of these references disclose the mixtures of this invention.
SUMMARY OF THE INVENTION
This invention relates to mixtures of methyl o!carbonyl!amino!sulfonyl!-3-methylbenzoate (triflusulfuron methyl, Formula I) ##STR1## and agriculturally suitable salts thereof with N-(phosphonomethyl)glycine (glyphosate, Formula II) ##STR2## and agriculturally suitable salts, which have now been discovered to synergistically control weeds. This invention also relates to herbicidal compositions comprising effective amounts of the aforesaid mixtures and at least one of the following: surfactant, solid or liquid diluent. This invention also relates to a method for controlling undesired vegetation comprising applying to the locus of the vegetation herbicidally effective amounts of the aforesaid mixtures.
Agriculturally suitable salts of N-(phosphonomethyl)glycine (Formula II) include, but are not limited to, the salts described by Formula IIa ##STR3## wherein R.sup.1, R.sup.2 and R.sup.3 are independently selected from the group consisting of --OH and --OR.sup.4, wherein R.sup.4 is a salt-forming cation selected from the group consisting of alkali metals, alkaline earth metals, ammonium, and alkyl amrnmonium and mixtures thereof, provided that no more than two of R.sup.1, R.sup.2 and R.sup.3 are --OR.sup.4 when R.sup.4 is ammonium or alkyl ammonium and that no more than two of R.sup.1, R.sup.2 and R.sup.3 are --OH; R.sup.4 can also be alkyl sulfonium or alkyl sulfoxonium when R.sup.1 and R.sup.3 are --OH. Alkyl ammonium includes mono-, di-, tri- and tetra-alkylammonium. Alkyl sulfonium means trialkylsulfonium, and alkyl sulfoxonium means trialkylsulfoxonium, where the alkyl groups are independently C.sub.1 -C.sub.3 alkyl.
The mixtures of the invention preferred for enhanced activity include: mono (isopropylammonium) salt of N-(phosphonomethyl)glycine (Formula II) having the common name glyphosate-isopropylammonium. mono (trimethylsulfonium) salt of N-(phosphonomethyl)glycine (Formula II) having the common name glyphosate-trimesium.
For reason of weed control spectrum and/or crop selectivity, the preferred crops for application of the mixtures of this invention are sugar beet lines, varieties and cultivars containing at least one gene that confers tolerance to herbicides containing N-(phosphonomethyl)glycine or an agriculturally suitable salt as the active ingredient.
DETAILS OF THE INVENTION
The Formula I sulfonylurea can be prepared as described in U.S. Pat. No. 5,090,993. The synthesis involves the coupling of the N-silylsulfonamide of Formula 1 with the heterocyclic carbamate of Formula 2. ##STR4##
The mixtures of the present invention can include the sulfonylurea of Formula I in the form of agriculturally suitable salts thereof. These can be prepared in a number of ways known in the art. Fo
REFERENCES:
patent: 4315765 (1982-02-01), Large
patent: 4405531 (1983-09-01), Franz
patent: 4940835 (1990-07-01), Shah et al.
patent: 4971908 (1990-11-01), Kishore et al.
patent: 5090993 (1992-02-01), Moon
patent: 5188642 (1993-02-01), Shah et al.
patent: 5310667 (1994-05-01), Eichholtz et al.
Hance et al., Weed Control Handbook, 8.sup.th Ed., 1989.
E. I. Du Pont de Nemours and Company
Robinson Allen J.
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