Herbicidal compositions

Details Herbicidal compositions Herbicidal compositions

1998-10-01

2000-04-04

Clardy, S. Mark

Plant protecting and regulating compositions

Plant growth regulating compositions

Plural active ingredients

504141, A01N 3734, A01N 3306, A01N 3718, A01N 4110, A01N 4366

Patent

active

060461330

DESCRIPTION:

BRIEF SUMMARY
This invention relates to new herbicidally active compositions comprising a 2-cyano-1,3-dione derivative and another herbicide.
European Patent Publication Nos. 0496630, 0496631, 0625505 and 0625508 disclose certain I -phenyl-2-cyano-1,3-dione derivatives possessing herbicidal properties. European Patent Publication No. 0213892 discloses herbicidally active enols. While possessing a good level of herbicidal activity, many of these compounds lack a broad enough spectrum of activity to control certain weeds infesting areas used or to be used for growing crops (for example maize or sugar cane). A number of known herbicides provide control of many weeds infesting crop-growing areas. These include: 1,3,5-triazine and 1,2,4-triazinone herbicides (hereinafter referred to as triazine herbicides) such as ametryn (N.sup.2 -ethyl-N.sup.4 -isopropyl-6-methylthio-1,3,5-triazine-2,4-diamine), atrazine (6-chloro-N.sup.2 -ethyl-N.sup.4 -isopropyl-1,3,5-triazine-2,4-diamine), terbutryn (N.sup.2 -tert-butyl-N.sup.4 -ethyl-6-methylthio-1,3,5-triazine-2,4-diamine) and metribuzin (4-amino-6-tert-butyl-3-methylthio-1,2,4-triazin-5(4H)-one); Chloroacetamides such as alachlor (2-chloro-2',6'-diethyl-N-methoxymethylacetanilide), acetochnor (2-chloro-N-ethoxymethyl-6'-ethylacet-o-toluidide), metolachlor [2-chloro-6'-ethyl-N-(2-methoxy-1-methylethyl)acet-o-toluidide], propachlor (2-chloro-N-isopropylacetanilide) and dimethenamid [2-chloro-N-(2,4-dimethyl-3-thienyl)-N-(2-methoxy-1-methylethyl)acetamide] ; 2,6-dinitroaniline herbicides such as pendimethalin [N-(1-ethylpropyl)-3,4-dimethyl-2,6-dinitrobenzenamine] and trifluralin [2,6-dinitro-N,N-dipropyl-4-(trifluoromethyl)benzenamine]; aclonifen (2-chloro-6-nitro-3-phenoxyaniline), diuron [3-(3,4-dichlorophenyl)-1,1-dimethylurea]; and hydroxybenzonitrile herbicides such as bromoxynil [3,5-dibromo-4-hydroxybenzonitrile] and ioxynil [4-hydroxy-3,5-diiodobenzonitrile], each of which is disclosed in "The Pesticide Manual", 10th edition (British Crop Protection Council), 1994.
As a result of research and experimentation it has been found that the use of one or more of these herbicides, in combination with certain 2-cyano-1,3-dione derivatives, extends the spectrum of herbicidal activity. Therefore the said combinations represents an important technological advance. The term "combination" as used in this specification refers to the "combination" of the 2-cyano-1,3-dione derivative and the partner herbicide.
Surprisingly, in addition to this, it has been found that under certain conditions the combined herbicidal activity of certain 2-cyano-1,3-diones with certain other herbicides for the control of important weed species such as Setaria viridis, Setaria viridis, or Echinochloa crus-galli, is greater than expected, without an unacceptable increase in crop phytotoxicity, i.e the mixture shows synergism as defined by Limpel, L. E. P. H. Schuldt and D. Lamont, 1962, 1. Proc. NEWCC 16, 48-53, using the formula: ##EQU1## also known as the Colby formula (Colby S. R., 1967, Weeds 15, 20-22), where: A and B at defined doses.
When the observed percentage of inhibition by the mixture is greater than the expected value E using the formula above the combination is synergistic.
This unexpected synergistic effect gives improved reliability in controlling these competitive weeds of many crop species, and contributes to a considerable reduction in the amount of active ingredient required for weed control.
This remarkable synergistic effect gives improved reliability of control of a number of weed species and allows for a reduction in the amount of active ingredients employed.
A high level of control of these weeds is desirable to prevent:
According to the present invention there is provided a method of controlling the growth of weeds at a locus which comprises applying to the locus a herbicidally effective amount of: metal complex or enolic tautomeric form thereof; and chloroacetamide herbicide, a 2,6-dinitroaniline herbicide, aclonifen, diuron, and a hydroxybenzonitrile herbicide.
For this purpose, the 2-c

REFERENCES:
patent: 5222595 (1993-06-01), Gouge et al.
patent: 5224601 (1993-07-01), Gouge et al.
patent: 5323906 (1994-06-01), Gouge et al.
patent: 5351831 (1994-10-01), Gouge et al.
patent: 5804532 (1998-09-01), Cain et al.
The Pesticide Manual, ed. CliveTomlin, 10.sup.th edition, British Crop Protection Council, England, pp. 10-11, 14-15, 21-22, 32-33, 51-52, 345-346, 376-378, 693-694, 699-700, 779-780, 842-843, 962-963, and 1025-1026 (1994).
Pallett et al. "Inhibition of 4-Hydroxyphenylpyruvate Dioxygenase: the Mode of Action of the Herbicide RPA 201772 (Isoxaflutole)". Pesticide Science. 50:83-84. 1997. Summary of paper presented on Mar. 13, 1996.

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