Plant protecting and regulating compositions – Plant growth regulating compositions
Patent
1996-08-19
2000-01-04
Clardy, S. Mark
Plant protecting and regulating compositions
Plant growth regulating compositions
504270, 504301, 504304, 504309, 504319, A01N 2530
Patent
active
060109785
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to the use of a formulation based on at least one terpene hydrocarbon and/or one of its derivatives, in particular pine oil, and optionally on a surface-active agent, as adjuvant of a selective herbicidal composition or mixture.
2. Description of Related Art
Farmers use, on the different species which they grow, herbicides which are selective for the crop, in order to destroy the weeds while leaving the crop unharmed. These selective herbicides are used early, for example between emergence and stem elongation (at the latest coming into ear or flowering) of annual crops, in order to decrease the impact of competition from weeds on the yield. Under these conditions, they must be completely selective. These products have a foliar or root effect or both simultaneously.
The foliar effectiveness of these products can be improved by the use of adjuvants; this practice often has the effect of decreasing the selectivity of the mixture.
SUMMARY OF THE INVENTION
It has been discovered that the use of at least one terpene hydrocarbon and/or one of its derivatives according to the invention increases, in significant proportions, the effectiveness of the herbicides while retaining excellent selectivity of the mix with respect to the crop; moreover, the consistency of effect of the herbicide is also improved.
The subject of the invention is the use of at least one terpene hydrocarbon and/or one of its derivatives as adjuvant of a selective herbicidal mixture for cultivated areas or as coformulant of a selective herbicidal composition for cultivated areas, for the treatment of crops between emergence and coming into ear or flowering.
As coformulant, the terpene hydrocarbons and/or their derivatives may be intended, for example, for a manufacturer who will incorporate them as coformulant during the manufacture of the said herbicidal composition, at the same time as the active material and the different normal ingredients of such a composition. They may be intended for a final user, for example for a farmer, in which case it will preferably be formulated in combination with a compatible surface-active agent, in order to form an adjuvant. This adjuvant will be intended to be added to a dilute herbicidal mixture.
Advantageously, in the case where the terpene hydrocarbons and/or their derivatives are formulated in conjunction with a surfactant, the formulation will comprise from 95 to 60% by weight of terpene hydrocarbon or derivative of the latter and from 5 to 40% by weight of a surface-active agent, preferably 20 to 30% by weight of surface-active agent.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT(S)
The terpene derivatives within the meaning of the present invention are of all types of terpene hydrocarbon having 2, 3 or 2n isoprene units per molecule, with n ranging from 2 to 8 and even beyond. They are mono-, sesqui-, di-, tri-, tetra- and polyterpenes.
The terpene hydrocarbons can be acyclic, monocyclic or bicyclic.
Mention may in particular be made of the following examples: like .DELTA.-3-carene and the like.
Terpene hydrocarbon derivatives are understood to mean in particular the following compounds: .beta.-pinene
The invention also comprises mixtures of terpene alcohols and hydrocarbons, for example pine oil of natural or synthetic origin (obtained, for example, by catalytic hydration of .alpha.-pinene).
Pine oils are composed of mixtures of terpene hydrocarbons and alcohols which can contain from 50% by weight of terpene alcohols, preferably 80 to 90% by weight.
The surface-active agent comprises any agent capable of emulsifying the terpene hydrocarbon and/or a derivative of the latter when it is added to the herbicidal mixture.
In particular, the surface-active agent can comprise an anionic surface-active agent, for example an alkali metal alkyl sulphate, in particular a sodium alkyl sulphate, for example a product marketed under the name MELIORAN 118.RTM. by the company CECA, a non-ionic surface-active agent, such as an ethoxyl
REFERENCES:
patent: 3776714 (1973-12-01), Bordenca
patent: 3871863 (1975-03-01), Dorschner et al.
patent: 4822407 (1989-04-01), Esposito
H. Martin, "The Scientific Principles of Plant Protection", E. Arnold. London GB, pp. 75-81, 1994.
C. Gauvrit et al., "Oils for Weed Control: Uses and Mode of Action", Pestic. Sci., vol. 37, pp. 147-153, 1993.
ACS abstract, AN 122:25843, "Possibility of Reducing Dosage of Pesticides in Potato Protection", Kowanski et al. Mater, Ses. Navk. Inst., 1992, 31(2) 66-70.
ACS abstract, AN 116:78605 corresponding to JP 03086802 A2 published 910411 Heisei, 1991.
ACS abstract, AN 119:65585, "Volatile monoterpenes as potential parent structures for new herbicides", Vaughn et al., Weed Sci., (1993), 41(1) 114-119.
Derwent abstract, WPI, AN:94-310851, corresponding to AU 5194293D, 1994.
Dufau Chislain
Lauilhe Jean-Paul
Action Pin
Clardy S. Mark
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