Plant protecting and regulating compositions – Plant growth regulating compositions – Organic active compound containing
Patent
1996-11-18
1997-09-16
Burn, Brian M.
Plant protecting and regulating compositions
Plant growth regulating compositions
Organic active compound containing
504116, 504250, 71DIG1, A01N 4360, A01N 4340
Patent
active
056680864
DESCRIPTION:
BRIEF SUMMARY
This application is A 371 of PCT/JP94/01953 filed Nov. 18, 1994.
1. Technical Field
The present invention relates to a herbicide composition, and particularly to a herbicide composition enhanced in its herbicidal effect.
2. Background Art
Paraquat (1,1'-dimethyl-4,4'-bipyridinium dichloride) and diquat (1,1'-ethylene-2,2'-bipyridinium dibromide) are bipyridinium type contact herbicides, have no selectivity and exhibit strong weed-killing power by a foliage treatment. Therefore, they are widely used. In herbicide compositions containing these compounds, in which their herbicidal components are diluted with water before their sprinkling, an anionic surfactant is incorporated for the purpose of evenly applying such a liquid chemical to the surfaces of stems and leaves of a target plant and causing the liquid chemical applied to remain for a long period of time on the stems and leaves so as to penetrate into the plant body (Japanese Patent Application Laid-Open No. 230608/1992).
However, the herbicidal effects of these compositions containing the bipyridinium type herbicide and the anionic surfactant have not been fully satisfactory. On the contrary, the herbicidal effects have been lowered according to the kind of an anionic surfactant to be used. The cause of this reduction in activity is considered to be attributed to the fact that the bipyridinium type herbicide forms a complex with the anionic surfactant.
The above-described bipyridinium type herbicides have also involved a problem that the amount of the herbicide to be used is limited due to their high toxicity.
Accordingly, it is an object of the present invention to provide a composition in which the herbicidal effect of a bipyridinium type herbicide is enhanced.
DISCLOSURE OF THE INVENTION
In view of the foregoing circumstances, the present inventors have added various components to a combined system containing a bipyridinium type herbicide and an anionic surfactant to carry out an investigation as to the effects of such components for enhancing the herbicidal activity. As a result, it has been found that when a chelating agent is added in a proportion of 0.1-3 moles per mole of the pyridinium type herbicide, the herbicidal activity is markedly enhanced, thus leading to completion of the present invention.
According to the present invention, there is thus provided a herbicide composition comprising the following components (a), (b) and (c): 0.1-3.
BEST MODE FOR CARRYING OUT THE INVENTION
The component (a) in the present invention is an active component for weeding. Paraquat and diquat can be used either singly or in combination. No particular limitation is imposed on the amount of the component (a) to be incorporated into the composition so far as it is sufficient to attain satisfactory herbicidal activity. It is also permissible to prepare a composition containing the component (a) at a high concentration in advance and dilute the composition at the time of use. Specifically, the component (a) is incorporated so as to give a concentration of preferably 0.1-50 wt. % (hereinafter indicated merely by "%"), more preferably 0.1-20%, particularly preferably 0.5-15% of the total weight of the composition. At the time the herbicide composition is used, it is preferably diluted for use in such a manner that the concentration of the component (a) amounts to 0.005-0.8%, particularly 0.005-0.5%.
Examples of the anionic surfactant of the component (b) include salts of higher fatty acids, alkyl(or alkenyl)sulfates, polyoxyalkylene alkyl(or alkenyl)ether sulfates, polyoxyalkylene alkyl(or alkenyl)aryl ether sulfates, polyoxyalkylene styrylphenyl ether sulfates, mono- or di-alkyl(or alkenyl)benzenesulfonates, alkyl(or alkenyl)naphthalenesulfonates, condensates of an alkyl(or alkenyl)naphthalenesulfonate with formaldehyde, alkyl(or alkenyl)diphenyl ether sulfonates, alkyl(or alkenyl)sulfonates, alkyl(or alkenyl)sulfosuccinates, mono- or di-alkyl(or alkenyl)phosphates, polyoxyalkylene mono- or di-alkyl (or alkenyl)ether phosphates, polyoxyalkylene mono- or di-ph
REFERENCES:
patent: 5538937 (1996-07-01), Hasebe et al.
Kazuhiko Kurita
Keiko Hasabe
Tadayuki Suzuki
Yuichi Hioki
Bembenick Brian
Burn Brian M.
Kao Corporation
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