Plant protecting and regulating compositions – Antidotes – Hetero ring containing antidote
Reexamination Certificate
2002-12-02
2004-06-08
Pryor, Alton N. (Department: 1616)
Plant protecting and regulating compositions
Antidotes
Hetero ring containing antidote
C504S138000, C504S196000, C504S309000
Reexamination Certificate
active
06746987
ABSTRACT:
The present invention relates to novel selective herbicidal compositions for controlling grasses and weeds in crops of cultivated plants, especially in crops of cereals and maize, which compositions comprise a herbicide and a safener (antidote) and protect the cultivated plants, but not the weeds, from the phytotoxic action of the herbicide, and to the use of said composition for controlling weeds in crops of cultivated plants.
When applying herbicides, the cultivated plants may also suffer severe damage owing to factors that include the concentration of the herbicide and the mode of application, the cultivated plant itself, the nature of the soil, and the climatic conditions such as exposure to light, temperature and rainfall. To counteract this problem and similar ones, the proposal has already been made to use different compounds as safeners which are able to antagonise the harmful action of the herbicide on the cultivated plant, i.e. to protect the cultivated plant while leaving the herbicidal action on the weeds to be controlled virtually unimpaired. It has, however, been found that the proposed safeners often have a very specific action with respect not only to the cultivated plants but also to the herbicide, and in some cases also subject to the mode of application, i.e. a specific safener will often be suitable only for a specific cultivated plant and a specific class of herbicide or a specific herbicide. Thus, for example, EP-A-0 551 650 discloses compounds that protect cultivated plants from the phytotoxic action of herbicides including 2-acylated 1,3-dicarbonyl compounds.
It has now been found that compounds of formula II
or the ethyl esters therof are suitable for protecting cultivated plants from the phytotoxic action of a certain class of pyrazolyl herbicides.
Accordingly, the invention provides a selective herbicidal composition comprising, in addition to customary inert formulation assistants such as carriers, solvents and wetting agents, a mixture of
a) a herbicidally effective amount of a herbicide of formula I
wherein
Q is the group
R
1
is hydrogen, —COO—C
1
-C
4
-alkyl, —SO—C
1
-C
4
-alkyl or —SO—C
1
-C
4
-alkyl; and
b) to antagonise the herbicide, an antidotally effective amount of a safener of formula II
or the ethyl esters thereof.
The invention also relates to a method of selectively controlling weeds in crops of cultivated plants, which comprises treating said cultivated plants, the seeds or seedlings or the crop area thereof, concurrently or separately, with a herbicidally effective amount of the herbicide of formula I and, to antagonise the herbicide, an antidotally effective amount of the safener of formula II.
Suitable cultivated plants which can be protected by the safeners of formula II against the harmful action of the aforementioned herbicides are preferably cereals, cotton, soybean, sugar beet, sugar cane, plantations, rape, maize and rice, most particularly in maize.
Crops will also be understood as meaning those crops that have been made tolerant to herbicides or classes of herbicides by conventional breeding or genetic engineering methods.
The weeds to be controlled may be monocot as well as dicot weeds, typically Stellaria, Nasturtium, Agrostis, Digitaria, Avena, Setaria, Sinapis, Lolium, Solanum, Echinochloa, Scirpus, Monochoria, Sagittaria, Bromus, Alopecurus, Sorghum halepense, Rottboellia, Cyperus, Abutilon, Sida, Xanthium, Amaranthus, Chenopodium, Ipomoea, Chrysanthemum, Galium, Viola and Veronica.
Crop areas will be understood as meaning the areas already under cultivation with the cultivated plants or seeds thereof, as well as the areas intended for cropping with said cultivated plants.
Depending on the end use, a safener of formula II can be used for pretreating seeds of the crop plants (dressing of seeds or seedlings) or it can be incorporated in the soil before or after sowing. It can, however, also be applied by itself alone or together with the herbicide postemergence. Treatment of the plant or the seeds with the safener can therefore in principle be carried out irrespective of the time of application of the herbicide. Treatment can, however, also be carried out by simultaneous application of the herbicide and safener (e.g. as tank mixture). The concentration of safener with respect to the herbicide will depend substantially on the mode of application. Where a field treatment is carried out either by using a tank mixture with a combination of safener and herbicide or by separate application of safener and herbicide, the ratio of safener to herbicide will usually be from 100:1 to 1:100, preferably 20:1 to 1:20.
In the context of the present invention, alkyl is methyl, ethyl, n-propyl, isopropyl, n-butyl, sec.-butyl, isobutyl and tert.-butyl.
The compound of formula I, wherein Q is Q
1
and R
1
is hydrogen, is known for example from the Pesticide Manual, eleventh ed., British Crop Protection Council, 1997. The remaining compounds of formula I are described e.g. in WO 97/43270 and in WO 99/51583. The compound of formula I, in which Q is Q
2
, is described in EP-A-0 496 631. The compound of formula II is known from DE-A-4331448.
Preferred compositions according to the invention contain a compound of formula I, in which Q is Q
1
and R
1
is hydrogen, —SOCH
3
or —SCH
3
.
In field treatment it is usual to apply 0.001 to 5.0 kg/ha, preferably 0.001 to 0.5 kg/ha, of safener.
The concentration of herbicide is usually in the range from 0.001 to 2 kg/ha, but will preferably be from 0.005 to 1 kg/ha.
The compositions of this invention are suitable for all methods of application commonly used in agriculture, including pre-emergence application, post-emergence application and seed dressing. For seed dressing, 0.001 to 10 g of safener/kg of seeds, preferably 0.05 to 2 g of safener/kg of seeds, is usually applied. If the safener is used in liquid form shortly before sowing to effect soaking, then it is preferred to use safener solutions that contain the active ingredient in a concentration of 1 to 10000 ppm, preferably of 100 to 1000 ppm.
For application, it is preferred to process the safeners of formula II, or mixtures of the safeners of formula II and the herbicides of formula I, conveniently together with the customary formulation assistants to formulations, typically to emulsifiable concentrates, coatable pastes, directly sprayable or dilutable solutions, dilute emulsions, wettable powders, soluble powders, dusts, granulates or microcapsules. Such formulations are described, for example, in WO 97/34485, pages 9 to 13. The formulations are prepared in known manner, conveniently by homogeneously mixing and/or grinding the active ingredients with liquid or solid formulation assistants, typically solvents or solid carriers. Surface-active compounds (surfactants) may additionally be used for preparing the formulations. Suitable solvents and solid carriers for this purpose are also described in said WO 97/34485, page 6.
Depending on the type of herbicide of formula I to be formulated, suitable surface-active compounds are nonionic, cationic and/or anionic surfactants and surfactant mixtures having good emulsifying, dispersing and wetting properties. Examples of suitable anionic, nonionic, and cationic surfactants are listed for example in said WO 97/34485, pages 7 to 8. Also the surfactants customarily for the art of formulation and described, inter alia, in “Mc Cutcheon's Detergents and Emulsifiers Annual” MC Publishing Corp., Ridgewood N.J., 1981, Stache, H., “Tensid-Taschenbuch” (Handbook of Surfactants), Carl Hanser Verlag, Munich/Vienna, 1981, and M. and J. Ash, “Encyclopedia of Surfactants”, Vol I-III Chemical Publishing Co., New York, 1980-81 are suitable for manufacture of the herbicidal compositions according to the invention.
The herbicidal compositions will usually contain from 0.1 to 99% by weight, preferably from 0.1 to 95% by weight, of compound mixture of the compound of formula I and the compounds of formulae II, from 1 to 99.9% by weight of a solid or liquid formulation assistant, and from 0 to 25% by weight,
Hamilton Thomas
Pryor Alton N.
Syngenta Crop Protection Inc.
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