Plant protecting and regulating compositions – Plant growth regulating compositions – Organic active compound containing
Reexamination Certificate
2001-11-02
2003-02-04
Clardy, S. Mark (Department: 1616)
Plant protecting and regulating compositions
Plant growth regulating compositions
Organic active compound containing
Reexamination Certificate
active
06514913
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a novel weed growth inhibitor composition for a lawn grass and an upland farm, and a method for cultivation and management of a lawn grass.
BACKGROUND ART
In golf courses and so on, various lawn grasses, such as Japanese lawn grasses and American or European lawn grasses, are cultivated and managed, and their varieties are numerous. These lawn grasses have varying degrees of resistance to herbicides. Thus, if it is attempted to obtain a sufficient herbicidal effect simultaneously on different varieties of lawn grasses with the use of a single herbicide, phytotoxicity occurs to those varieties of lawn grasses which are poorly resistant. Hence, many types of herbicides are marketed and used according to the varieties of lawn grasses. In upland farms where crops, such as wheat, barley, rye and oats (hereinafter referred to as “wheat and the like”) and vegetables, are cultivated, annual weeds mainly occur repeatedly, so that many herbicides for their control are known.
In sowing seeds of a lawn grass to breed turf, early-stage weed control is important. This is because many of weeds developing on the turf occur throughout the year; thus, as the lawn grass grows, the growth of the weeds proceeds, and the effect of a herbicide tends to decline from the viewpoint of weed control. However, application of a herbicide before or after sowing of lawn grass seeds is apt to cause phytotoxicity. Currently, therefore, there is no choice but to apply a herbicide after lawn grass breeding.
Accordingly, a desire has been expressed for a herbicide which, used alone, can produce a sufficient herbicidal effect on many varieties of lawn grasses and crops, and which is safe for lawn grasses and crops such as vegetables without causing phytotoxicity even when applied before or after sowing of lawn grass seeds.
DISCLOSURE OF THE INVENTION
It is an object of the present invention to provide a herbicide composition which can achieve a sufficient herbicidal effect simultaneously on many varieties of lawn grasses and crops alone, and which is safe for lawn grasses without causing phytotoxicity even when applied before or after sowing of lawn grass seeds. It is also another object of the present invention to provide a method for sowing lawn grass seeds and breeding turf with the use of such a herbicide composition.
The inventors of the present invention have conducted extensive studies in an attempt to solve the above-described problems, and found that 1-(2-chlorobenzyl)-3-(1-methyl-1-phenylethyl)urea (hereinafter sometimes referred to as “cumyluron”) is highly safe, particularly, for lawn grasses, and shows an unsurpassed effect against annual bluegrass (
Poa annua L.
), flat-sedge (
Cyperus microiria
), etc., which are main turf weeds. They have also found that no phytotoxicity occurs even when cumyluron is applied before or after, or simultaneously with, sowing seeds of a lawn grass, such as ryegrasses (
Lolium SPP.
), to be seeded in breeding turf, and that no phytotoxicity occurs even when the above chemical is applied before or after, or simultaneously with, overseeding seeds of a lawn grass, such as ryegrass, onto an already bred turf.
In regard to weeds occurring in upland farms for cultivation of crops such as vegetables, cumyluron has also been found to exhibit a marked growth inhibiting effect on main weeds, including annual gramineous weeds such as annual bluegrass and foxtail, annual sedge weeds such as flat-sedge (
Cyperus microiria
), and perennial sedge weeds such as purple nutsedge (
Cyperus rotundus
) and
Cyperus brevifolius,
without causing phytotoxicity to wheat, etc. and vegetables.
Therefore, the present invention is a weed growth inhibitor composition for a lawn grass or an upland farm, which comprises cumyluron as an active ingredient.
The present invention is also a weed growth inhibitor composition for a lawn grass or an upland farm, which comprises an effective amount of cumyluron along with a carrier.
Moreover, the present invention is a method for inhibiting the growth of weeds, comprising application of a composition, which comprises an effective amount of cumyluron, to turf or an upland farm.
Furthermore, the present invention is a method for cultivation and management of a lawn grass, comprising application of a composition, which comprises an effective amount of cumyluron, before or after, or simultaneously with, overseeding lawn grass seeds to turf.
PREFERRED EMBODIMENTS FOR CARRYING OUT THE INVENTION
Cumyluron is a known compound disclosed in JP 60-72910 A/1985, JP 5-155710 A/1993, JP 5-155720 A/1993, JP 5-155721 A/1993, JP 5-255018 A/1993, JP 5-255022 A/1993, JP 5-294807 A/1993, JP 5-320011 A/1993, and JP 7-2602 A/1995. In these publications, cumyluron is disclosed only as an active ingredient of a herbicide composition for a paddy field, and its effectiveness as a weed growth inhibitor composition for a lawn grass and an upland farm, especially for a lawn grass, is neither suggested nor disclosed. Hence, a weed growth inhibitor composition for a lawn grass and an upland farm, containing cumyluron as an active ingredient, according to the present invention is novel.
In the present invention, the terms “weed growth inhibitor composition” are interchangeable with the term “herbicide”.
The composition of the present invention contains a solid carrier and/or a liquid carrier, and can be present in various forms, such as granules, fine granules, wettable powder, water dispersible granules, emulsifiable concentrate, flowable (suspension concentrate), and dust, which are ordinary forms of agricultural chemicals when in use. For a lawn grass, the composition is often diluted about 1:100 to 1:1000 with water, and applied. Thus, a wettable powder, water dispersible granules, and a flowable are preferred.
The amount of cumyluron which is the active ingredient of the composition of the present invention is generally 0.5 to 95% by weight, preferably 1 to 70% by weight, more preferably 3 to 50% by weight, and most preferably 5 to 50% by weight based on the total weight of the composition, when in the form of granules or fine granules. For a wettable powder or water dispersible granules, the amount of cumyluron is generally 10 to 95% by weight, preferably 20 to 90% by weight, more preferably 30 to 85% by weight, and most preferably 50 to 80% by weight. For a flowable, the amount of cumyluron is generally 1 to 70% by weight, preferably 5 to 65% by weight, more preferably 20 to 60% by weight, and most preferably 30 to 55% by weight.
Examples of the solid carrier include mineral powders such as calcium carbonate, apatite, gypsum, silica gel, vermiculite, mica, diatomaceous earth, talc, pyrophyllite, acid clay, kaolin clay, silica clay, kaolinite, montmorillonite, bentonite, white carbon and pumice powder, plant powders such as microcrystalline cellulose and starch, and polymeric compounds such as polyvinyl chloride, xanthan gum and petroleum resin.
Examples of the liquid carrier include alcohols such as methanol, ethanol, cyclohexanol, amyl alcohol and ethylene glycol, aromatic hydrocarbons such as xylene and methyl naphthalene, halogenated hydrocarbons such as chlorobenzene and trichloroethylene, ethers such as ethyl cellosolve, butyl cellosolve and dioxane, esters such as isopropyl acetate and benzyl acetate, polar solvents such as dimethyl sulfoxide, kerosine, mineral oil, and water.
If necessary, stabilizers or adjuvants in customary use for agricultural chemicals, such as surface active agents, spreaders, and binders, may be formulated, whereby the reliability of the weed growth inhibiting effect can be enhanced.
The weed growth inhibitor composition of the present invention may, if desired, contain an insecticide, a fungicide, a plant growth regulator, a fertilizer, or other herbicide, or can be used in combination with these agents.
The weed growth inhibitor composition of the present invention can be made into a desired form by mixing cumyluron and the above-described carrier and/or the adjuvant or stabilizer, followed by dispersi
Tanaka Hirotoshi
Tomita Makoto
Clardy S. Mark
Marubeni Agrotec Corporation
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