JPH0881315A - Herbicide composition - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a highly selective lawn herbicide. [Structure] The compound represented by the formula (I) and the formula (II): A herbicidal composition comprising a compound represented by: This composition exhibits a highly selective herbicidal effect on both grass and broadleaf weeds in lawn and the additive and synergistic effects of compound (I) and compound (II).

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a lawn herbicide composition.

[0002]

BACKGROUND OF THE INVENTION In order to control weeds on lawns such as golf courses and parks, herbicides have been researched and developed for many years, and various chemicals have been put to practical use. However, a herbicide capable of simultaneously controlling grass weeds and broad-leaved weeds without causing any phytotoxicity to lawns, especially to grass, has not yet been developed. For example, Prodiamine wettable powder is a drug registered as a pesticide in Tifton, Bentgrass, and Kentucky Bluegrass, but not Asteraceae weeds. Imazosulfuron wettable powder is registered as a pesticide in bentgrass and Kentucky bluegrass, and has a high herbicidal effect on annual broadleaf weeds, but it is not effective against grass weeds and is not covered. Therefore, none of the current herbicides is capable of controlling grass weeds and broadleaf weeds in the grass at the same time.

[0003]

DISCLOSURE OF THE INVENTION As a result of intensive investigations by the present inventors in view of the above problems, the formula (I):

[Chemical 3] And a compound represented by formula (II):

[Chemical 4] By combining with the compound represented by, the herbicidal effect is simply added to many grasses and broad-leaved weeds without causing any phytotoxicity on lawns containing grass. Not only that, the present invention was found to exert synergistic effects, and the present invention was completed.

Compound (I) is disclosed in JP-A-60-208977.
The compound described in the above publication has a superior herbicidal effect with a lower dose than conventional herbicides, and has high safety against crops such as corn and wheat and lawn. Also,
It is not only effective against many annual weeds but also effective against perennial weeds, and its utility is great.

Compound (II) is disclosed in JP-A-2-233665.
The compound described in the above publication has high safety against transplanted paddy rice and lawn, and exhibits a strong efficacy against grass weeds such as Novier, Crabgrass and Poa annua.

The composition of the present invention generally depends on the relative activity of each component against individual weeds, but is generally compound (I) 1.
The compound (II) is contained in an amount of 0.1 to 1000 parts by weight per part by weight. In many cases, the greatest advantage of the combined herbicides of the invention is that 1 part by weight of compound (I) is 1
500 parts by weight, especially 2 to 20 parts by weight, more particularly 2.5 to
Obtained at 10 parts by weight. The treatment amount of these mixtures is preferably 0.005 to 1 g / m ² as an active ingredient.

The use of the composition of the present invention enables simultaneous selective weeding of grass weeds and broad-leaved weeds in a wide range of lawns, which could not be realized conventionally. That is, it became possible to selectively simultaneously weed grasses such as grass grass, bentgrass, and Kentucky bluegrass including grass, grass grass and broad-leaved weeds, such as honeywort, bluegrass, dandelion, and himeguku. The herbicidal action is not only additive but also synergistic.

The compositions according to the invention are preferably used in the form of compositions in which the active ingredient is mixed with a carrier which comprises a solid or liquid diluent. The composition preferably further comprises a surfactant. In applying the composition of the present invention as a herbicide, generally, a suitable carrier, such as clay, talc, bentonite, a solid carrier such as diatomaceous earth or water, alcohols (methanol, ethanol, etc.), aromatic hydrocarbons (benzene, It can be used by mixing with a liquid carrier such as chlorinated hydrocarbons, toluene, xylene, etc.), ethers, ketones, esters (ethyl acetate, etc.), acid amides (dimethylformamide, etc.), and if desired, an emulsifier. , Wetting agents, dispersants, binders, penetrants, spreading agents, stabilizers, etc., in any dosage form such as emulsions, liquids, wettable powders, powders, granules, granules, suspensions, etc. It can be put to practical use. At the same time, several other herbicides, insecticides, fungicides,
It is also possible to mix and use with a plant growth regulator, fertilizer and the like.

The synergistic herbicidal effect of the herbicide mixture can be explained as follows. That is, although individual active compounds often exhibit their respective herbicidal activities, the herbicidal activity in the case of combining two active compounds is the simple activity of each of the two compounds. This is called synergy if it is greater than the sum (expected activity). The expected activity of a particular combination of two herbicides can be calculated as follows (note that the formula: Eq. 1 is called Colby's formula: the synergistic and antagonistic reaction of the Colby SR herbicide combination). "Weed," Vol. 15, pp. 20-22, 1967).

[Equation 1] α: Inhibition rate when the herbicide A was treated in the amount of aKg / ha β: Inhibition rate when the herbicide B was treated in the amount of bKg / ha E: The herbicide A was aKg / ha and the herbicide B It can be said that the combined activity shows a synergistic effect if the expected inhibition rate when treated with the amount of bKg / ha, that is, the actual inhibition rate is larger than the above calculation.

[0010]

[Examples] The present invention is described in more detail below with reference to Examples, but the compounds, dosage amounts, dosage forms and the like in the present invention are not limited to the Examples. All "parts" mean parts by weight.

[Table 1] The above is uniformly mixed and pulverized to obtain a wettable powder.

[0011]

[Table 2] Mix the above uniformly, add an appropriate amount of water and knead, 0.8
Extrude and granulate with a screen of mmφ and dry at 50 ° C. for 2 hours to obtain granules.

Test Example 1 Soil Treatment A sterilized field soil was put in a plastic box having a length of 30 cm, a width of 30 cm, and a depth of 10 cm, and seedlings of the corn rootweed, Aedes chinensis, and dandelion seeds and rhizomes of Koshi-shiba were sowed in spots. 0.5
cm covered with soil. On the day of sowing, the soil was treated with a sprayed water amount of 100 cc / m ² . The chemical solution for spraying was prepared by diluting an appropriately prepared wettable powder with water according to the above formulation example and spraying it with a small spray. Three weeks after spraying the drug solution, the above-ground fresh weight was measured, and the inhibition rate (%) was calculated by the following formula.

[Equation 2] Table 1 shows the results of the herbicidal effect test of the single agents of compound (I) and compound (II). Table 2 shows the test results when the compound (I) and the compound (II) were mixed.

[0013]

[Table 3] Table 1: Herbicidal effects of single agents (inhibition rate,%) ──────────────────────────────── ───── Compound Active ingredient Meshishiba Suzumeno Hyacinthia serrata Processing amount (g / m ² ) Catavira dandelion citrus ───────────────────────── ─────────── Compound (I) 0.002 23 18 72 60 0 0.004 39 26 93 93 85 0 ──────────────────── ───────────────── Compound (II) 0.005 65 52 5 10 0 0.01 90 90 75 12 12 23 0 ───────────── ───────────────────────

[0014]

[Table 4]

Test Example 2 Growth Stage Treatment Sterilized upland soil was placed in a plastic box having a length of 30 cm, a width of 30 cm, and a depth of 10 cm, and seeds of crabgrass, bluegrass, dandelion, and tubers of Himekugu were sown in spots. 5 cm of soil was covered. Furthermore, on the 7th day after sowing of the weeds, each sod of Koraishiba, bentgrass, and Kentucky bluegrass, which was cut into 10 cm squares and had a plant height of about 2 cm, was planted. 10 days after sowing of weeds
The treatment was carried out with a sprayed water amount of 0 cc / m ² . The chemical solution for spraying was prepared by diluting an appropriately prepared wettable powder with water according to the above formulation example and spraying it with a small spray. Three weeks after the chemical solution was sprayed, the above-ground fresh weight was measured, and the inhibition rate (%) was determined in the same manner as in Test Example 1. Table 3 shows the results of the herbicidal effect test of the single agents of compound (I) and compound (II). Table 4 shows the test results when the compound (I) and the compound (II) were mixed.

[0016]

[Table 5]

[0017]

[Table 6]

[0018]

By using the composition of the present invention,
It has become possible to simultaneously control grass weeds and broad-leaved weeds in a wide range of lawns that could not be realized in the past. That is, it became possible to selectively simultaneously weed grasses such as grass grass, bentgrass, and Kentucky bluegrass including grass, grass grass and broad-leaved weeds, such as honeywort, bluegrass, dandelion, and himeguku. The herbicidal action is not only additive but also synergistic.

Claims (2)

[Claims] 1. Formula (I): And a compound represented by the formula (II): A herbicidal composition comprising a compound represented by: as an active ingredient. 2. The herbicidal composition according to claim 1, which is for grass.