Plant protecting and regulating compositions – Plant growth regulating compositions – Plural active ingredients
Patent
1998-09-14
2000-02-29
Robinson, Allen J.
Plant protecting and regulating compositions
Plant growth regulating compositions
Plural active ingredients
504133, 504136, A01N 4354, A01N 4364
Patent
active
060309253
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/JP97/00158, filed Jan. 24, 1997.
FIELD OF THE INVENTION
The present invention relates to a herbicidal composition comprising at least two kinds of known herbicidally active ingredients, which can effectively control various harmful weeds in a paddy field.
BACKGROUND OF INVENTION
Various kinds of herbicides have been put to practical use by research and development concerning a herbicide for many years, which herbicides have contributed to laborsaving in controlling weeds and improving productivity of farm and garden crops. Development of a new herbicide having a more excellent herbicidal activity is, however, still needed. In particular, a herbicide for paddy rice is needed which can selectively control target weeds in lower dose without any phytotoxicity to paddy rice. Existing herbicides, however, do not necessarily meet these requirements.
Pyrazosulfuron ethyl (Common name; hereinafter referred to as Compound (I-1)), which can provide an excellent herbicidal effect with a lower dose as compared with conventional herbicides and show good safety to paddy rice, has been practically used. But pyrazosulfuron ethyl has inadequate effects on some weeds.
Halosulfuron methyl (Common name; hereinafter referred to as Compound (I-2)), which can provide an excellent herbicidal effect with a lower dose as compared with conventional herbicides and show good safety to corn, has been practically used for corn and suggested to apply to paddy rice. But halosulfuron methyl has inadequate effects on some weeds.
Metsulfuron methyl (Common name; hereinafter referred to as Compound (II)), which can also provide an excellent herbicidal effect with a lower dose as compared with conventional herbicides, has been practically used as a herbicide for wheat. Metsulfuron methyl is, however, less effective to Cyperaceae weeds and sometimes cause phytotoxicity to paddy rice with a higher dose, while it shows safety to paddy rice with a lower dose.
SUMMARY OF THE INVENTION
This invention relates to a herbicidal composition comprising Compound (II) and at least one compound selected from the group consisting of Compound (I-1) and Compound (I-2) as active ingredients (hereinafter referred to as the composition of the present invention).
According to the composition of the present invention, Compound (I-1), Compound (I-2) and Compound (II) can provide their herbicidal effects synergistically more than additively, and consequently the amount of each compound to be applied can be reduced.
The composition of the present invention is practically quite useful, since it can completely control many weeds with a low dose without any phytotoxicity to paddy rice. The composition of the present invention is highly effective to weeds in both pre-emergence soil treatment and post-emergence foliar treatment.
DETAILED DESCRIPTION OF THE INVENTION
In the composition of the present invention, Compound (II) is blended with Compound (I-1) and Compound (I-2) preferably at the ratio of 0.001-10 parts by weight of Compound (II) per 1 part by weight of Compound (I-1) and Compound (I-2), more preferably 0.01-1 parts by weight of Compound (II) per 1 part by weight of Compound (I-1) and Compound (I-2).
Suitable application rate of the composition of the present invention will vary depending on a type of target weed and the like. In general, the application rate is set such that it preferably corresponds to 1 g-1 kg/ha of Compound (I-1) or Compound (I-2) and 0.1-100 g/ha of Compound (II) as active ingredients, more preferably 5-100 g/ha of the former and 1-50 g/ha of the latter.
The composition of the present invention is usually used in a form of a formulation in which the active ingredients are mixed with a carrier usually consisting of a solid or liquid diluent. The formulation preferably also contains a surfactant.
Such an applicable carrier includes a solid carrier such as clay, talc, bentonite, diatomaceous earth and white carbon; and a liquid carrier such as water, alcohols (isopropanol, butanol, benzyl alcohol, fur
REFERENCES:
patent: 4370480 (1983-01-01), Levitt et al.
patent: 4668277 (1987-05-01), Yamamoto et al.
patent: 4954164 (1990-09-01), Suzuki et al.
patent: 5474971 (1995-12-01), Sandell
Tomlin, "The Pesticide Manual Incorporating the Agrochemicals Handbook," 10.sup.th ed. (1995) pp. 549,550,701,702,873 & 874.
Ishikawa Kimihiro
Nawamaki Tsutomu
Nissan Chemical Industries Ltd.
Robinson Allen J.
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