Plant protecting and regulating compositions – Plant growth regulating compositions – Plural active ingredients
Patent
1998-10-13
1999-11-23
Robinson, Allen J.
Plant protecting and regulating compositions
Plant growth regulating compositions
Plural active ingredients
504127, 504133, A01N 4364, A01N 5700
Patent
active
059900458
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.
Combinations of herbicides are typically used to broaden the spectrum of plant control or enhance the level of control of any given species through additive effect. Certain rare combinations surprisingly give a greater-than-additive or synergistic effect. Several such valuable combinations have now been discovered.
EP 739893-A1 discloses N-(4,6-dimethoxy-(1,3,5-triazin-2-yl)-N'-[[[3-3-fluoro-propyl)-2(3H)-thiaz olylidene]amino]sulfonyl]urea as a herbicide, but this reference does not disclose its mixtures with glyphosate or their surprising utility in synergistically controlling weeds.
SUMMARY OF THE INVENTION
This invention relates to mixtures of a sulfonylurea compound of Formula I ##STR1## wherein X and Y are independently selected from H and F, and agriculturally suitable salts thereof with N-(phosphonomethyl)glycine (glyphosate, Formula II) ##STR2## and agriculturally suitable salts thereof, 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 ammonium 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: N-(4,6-dimethoxy-1,3,5-triazin-2-yl)N'-[[[3-(3-fluoropropyl)-2(3H)-thiazol ylidene]amino]sulfonyl]urea (Formula I, X and Y are H), N-(4,6-dimethoxy-1,3,5-triazin-2-yl)-N'-[[[(3-(3,3,3-trifluoropropyl)-2(3H )-thiazolylidene]amino]sulfonyl]urea (Formula I, X and Y are F) and N-[[[3-(3,3-difluoropropyl)-2(3H)-thiazolylidene]amino]sulfonyl]-N'-(4,6di methoxy-1,3,5-triazin-2-yl)urea (Formula I, X is H and Y are F) together with the mono (isopropylammonium) salt of N-(phosphonomethyl)glycine (Formula II) having the common name glyphosate-isopropylammonium. N-(4,6-dimethoxy-1,3,5-triazin-2-yl)-N'-[[[3-(3-fluoropropyl)-2(3H)-thiazo lylidene]amino]sulfonyl]urea (Formula I, X and Y are H), N-(4,6-dimethoxy-1,3,5-triazin-2-yl)-N'-[[[3-(3,3,3-trifluoropropyl)-2(3H) -thiazolylidene]amino]sulfonyl]urea (Formula I, X and Y are F) and N-[[[3-(3,3-difluoropropyl)-2(3H)-thiazolylidene]amino]sulfonyl]-N'-(4,6-d imethoxy-1,3,5-t
REFERENCES:
Makino et al, C.A.; vol. 124 (1996) 124:289581b.
Suzuki et al, C.A. vol. 126 (1997) 126:74875f.
Leep Daniel Carl
Lichtner Francis T.
E.I. Du Pont de Nemours and Company
Robinson Allen J.
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