JP2008031061A - Method for controlling perennial gramineous weed in lawn - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for controlling perennial gramineous weeds in lawn to kill the hardly controllable perennial gramineous weeds without giving influence on the lawn. <P>SOLUTION: The method for controlling perennial gramineous weeds in lawn comprises the scattering of N'-methoxycarbonyl sulfanylamide sodium (general name; asulam) and 1-(4,6-dimethoxypyrimidin-2-yl)-3-[3-(2,2,2-trifluoroethoxy)-2-pyridylsulfonyl]urea (general name; tolyfloxysulfuron) or its salt. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for controlling weeds, and more particularly to a method for controlling perennial grass weeds in lawn.

  In recent years, the invasion damage of the grass family Chigaya and Merikenkarkaya, which are difficult to control, has become apparent in the green areas of electric power facilities. These difficult-to-control weeds are an obstacle to green space management because they grow quickly and have a high plant height. In order to control difficult-to-control weeds, there are methods of cutting the grass and replacing it with a powerful herbicide. However, mowing and turf renewal are expensive and the lawn dies.

  Although there exists a herbicide called a selective herbicide that can withstand weeds without withering the turf, it is impossible to control difficult-to-control weeds by using a known selective herbicide alone. This is because both grass and difficult-to-control weeds are grasses, and there is little difference in sensitivity to herbicides, making selective control difficult. Therefore, a control method using a mixture of several types of herbicides having different control mechanisms has been attempted (Patent Documents 1, 2, etc.).

Patent Document 2 discloses a drug A containing 37% of N′-methoxycarbonylsulfanilamide sodium (generic name: ashram) as an active ingredient, and 1- (4,6-dimethoxypyrimidin-2-yl) -3- (3- A control method using a mixture of Drug B containing 10% of trifluoromethyl-2-pyridylsulfonyl) urea (generic name: Fluzasulfuron) as an active ingredient is proposed. / 10a and drug B concentration 50 g / 10a), no control effect was seen, and 1.5 times the concentration (drug A concentration 900 ml / 10a and drug B concentration 75 g / 10a), Merikenkarkaya could be completely controlled, Although the above-ground part failed to grow, it did not completely die out, and a phenomenon of budding again occurred from the rhizome. The control method described in Patent Document 2 is presumed to be aimed at the combined action of herbicides by mixing the drug A and the drug B, but the control effect was insufficient.
JP-A-11-302112 (Claims) JP 2001-39806 A (Claims)

  An object of the present invention is to provide a method for controlling perennial grasses in a lawn, which kills difficult-to-control perennial grasses without affecting turf.

  The present inventors have intensively studied to solve the above-mentioned problems, and N′-methoxy, which is said to have a control effect of about 80% when used alone, is the grass family Tigaya and Merikenkarkaya in the early growth stage. In order to improve the control effect of sodium carbonylsulfanilamide, 1- (4,6-dimethoxypyrimidin-2-yl) -3-[(3- (2,2,2-trifluoro) has no effect when used alone. (Ethoxy) -2-pyridylsulfonyl) urea sodium salt (generic name: trifloxysulfuron sodium salt) is added and mixed as an active ingredient, phytotoxicity test on turf, selective control effect test on difficult control weeds, difficulty A verification test was conducted in the field where weeds were in full bloom. As a result, it was found that by mixing both active ingredients, it was surprisingly found that grasses that are difficult to control can be killed without affecting the grass, and the present invention has been completed.

That is, the present invention is as follows.
(1) N′-methoxycarbonylsulfanilamide sodium (generic name: ashram) and 1- (4,6-dimethoxypyrimidin-2-yl) -3-[(3- (2,2,2-trifluoroethoxy ) -2-pyridylsulfonyl) urea (generic name: trifloxysulfuron) or a salt thereof is sprayed to control a perennial grass weed in lawn.
(2) The method according to (1) above, wherein the perennial grass weed is Chigaya.
(3) The method according to (1) above, wherein the perennial grass weed is Merikenkarkaya.
(4) 3′-333 ml / 10a of N′-methoxycarbonylsulfanilamide sodium and 1- (4,6-dimethoxypyrimidin-2-yl) -3-[(3- (2,2,2-trifluoro The method according to the above (1), wherein 0.72-6.48 g / 10a of ethoxy) -2-pyridylsulfonyl) urea or a salt thereof is sprayed.

  According to the method of the present invention, the folic acid synthesis inhibitory action possessed by N'-methoxycarbonylsulfanilamide sodium is sufficiently exerted and sustained. And can control Merikenkarkaya.

  1- (4,6-dimethoxypyrimidin-2-yl) -3-[(3- (2,2,2-trifluoroethoxy) -2-pyridylsulfonyl) urea (hereinafter referred to as “trifluoroalkyl”) applied in the present invention. Examples of the salt of “cisulfuron”) include sodium salts.

  Examples of perennial grasses include Chigaya and Merikenkarkaya.

  The application amount of each active ingredient in the present invention varies depending on the target weeds, weather conditions, application method, application time, etc., but N′-methoxycarbonylsulfanilamide sodium (hereinafter referred to as “ashram”) is 33.3 to 333 ml / 10a. , Desirably 133.2 to 333 ml / 10a, and trifloxysulfuron or a salt thereof is 0.72 to 6.48 g / 10a, desirably 2.88 to 6.48 g / 10a.

  Each active ingredient is blended with various adjuvants according to the usual agricultural chemical formulation method, and formulated into a form of wettable powder, suspension, emulsion, granular wettable powder, granule, powder, water solvent, liquid, etc. Can be used.

  Examples of the auxiliary agent include solid carriers such as diatomaceous earth, slaked lime, calcium carbonate, clay, talc, white carbon, kaolin, bentonite, dikelite, water-soluble starch, sodium carbonate, sodium bicarbonate, sodium sulfate; olive oil, castor oil, straw oil, coconut oil , Sesame oil, corn oil, peanut oil, coconut oil, soybean oil, rapeseed oil, linseed oil, drill oil, white kerosene, liquid oil such as liquid oil, liquid extenders such as water; ethylene glycol, propylene glycol, propylene Solvents such as glycol monomethyl ether; alkyl sulfates, alkyl benzene sulfonates, dialkyl sulfosuccinates, lignin sulfonates, polyoxyethylene alkyl ethers, polyoxyethylene alkyl aryl ethers, polyoxyethylene fatty acid esters, polyols Siethylene sorbitan fatty acid ester, polyoxyethylene styryl phenyl ether, polycarboxylate, alkyl diglycol ether sulfate, polyoxyethylene alkylaryl ether sulfate, polyoxyethylene alkylaryl phosphate ester salt, polyoxyethylene hydrogenated castor oil, styryl Spreading agents and surfactants such as phenyl phosphate, condensate of naphthalene sulfonate and formalin; anti-settling agents such as aluminum magnesium silicic acid and organic bentonite, thickeners such as carboxymethyl cellulose, xanthan gum and polyvinyl alcohol Is mentioned. Moreover, since the product containing each active ingredient is marketed, respectively, they can be used.

  Currently marketed products include AZILAN (registered trademark) solution containing ashram (Bayer CropScience) and AZILAN 80SG (company), monlument granule hydrate containing trifloxysulfuron sodium (Syngenta), etc. There is. The amount of these products to be used is, for example, 90 to 900 ml product / 10a, preferably 360 to 900 ml product / 10a in the case of aziran solution (active ingredient 37.0%), monument granule wettable powder (active ingredient 72. 0%) is 1-9 g product / 10a, preferably 4-9 g product / 10a. A predetermined amount of these products is diluted with water to an appropriate concentration and sprayed.

  When the above products are mixed, a spreading agent may be added. Furthermore, it is also possible to use a mixture of insecticides, fungicides, other plant growth regulators and fertilizers.

  The application time of the method of the present invention cannot be defined unconditionally due to differences in weed generation time, generation status, etc., but twice a year, usually in spring (early growth of chigaya) and autumn (from the remaining chigaya rhizome) It is effective to spray twice after budding and growth. After spraying the drug, weeds can be cut appropriately.

  EXAMPLES Next, although an Example is given and this invention is demonstrated further in detail, this invention is not limited only to a following example.

Test Example 1 Test of phytotoxicity by pot seedling test After seeding 3 types of ground cover plant (Tiff Blair, Noshiba, Himeko ryashiba) in a polypropylene pot with an inner diameter of 14 cm and curing in the greenhouse until the ground cover plant grows vigorously. Eight kinds of herbicides shown in Table 1 were sprayed at a concentration of 3 levels. The amount of sprayed water was 16 ml in a 40 cm × 40 cm frame so that the amount was 100 L per 10a. Two planting pots were placed in a 40 cm × 40 cm frame and placed in a greenhouse after spraying the herbicide, and the growth was promoted to observe the degree of phytotoxicity for 52 days. Table 2 shows the results of phytotoxicity test.

  From the results of Tables 1 and 2, the test No. When 2 to 5 chemicals were applied, noshiba and himekoraishiba grew without any phytotoxicity.

Test example 2 Control test by pot seedling test One kind of ground cover plant (Noshiba), Merikenkarkaya, one kind of ground cover plant (Noshiba), and Chigaya were transplanted from inside the substation to a polypropylene pot with an inner diameter of 25.2 cm and a height of 30 cm. Then, after curing in the greenhouse until the growth of the ground cover plant became vigorous, seven kinds of herbicides shown in Table 3 were sprayed at the concentrations shown in Table 3. The amount of sprayed water was 100 ml in a 100 cm × 100 cm frame so that the amount was 100 L per 10a. Two planting pots were placed in a frame of 100 cm × 100 cm, placed in the greenhouse even after spraying the herbicide, and the herbicidal effect was investigated 336 days after the chemical treatment. The results are shown in Table 3. The herbicidal effect was evaluated according to the following criteria.
Evaluation criteria: ○ Fully covered by barb
△ 2-3 gramineous plants are growing while all the fleas are covered.
× Fully covered with grasses

Next, in order to grasp the relationship between the control method of Merikenkarkaya and Chigaya and rhizome death, the soiled Merikenkarkaya and Chigaya were removed from the pot together with the soil, the soil entangled in the roots was washed away with tap water, and the remaining roots were washed away. About Noshiba, Merikenkarkaya or Chigaya, the state of the rhizomes of Merikenkarkaya and Chigaya was visually observed. The results are shown in Table 4 together with the results of the survey on the death of stems and leaves. The evaluation was expressed by the following criteria.
Evaluation criteria: ○ Underground stems and foliage are completely dead
△ Some underground stems and foliage survived
× Underground stems and leaves are still alive

  From the results of Tables 3 to 4, it was found that mixed drugs containing ashram (Test Nos. 1 to 3) and glyphosate ammonium salt (Test No. 9) have a control effect at a high concentration against Merikenkarkaya. . However, in Test Nos. 2 to 3, the fever grew without phytotoxicity, whereas the fever was dead in the glyphosate ammonium salt which is a non-selective herbicide. The trifloxysulfuron sodium salt alone had no control effect, but the control effect was manifested when mixed with ashram. Test No. having a control effect 2 and No. When comparing No. 3 by dose, Test No. 2 required 7.5 g of an active ingredient as a drug mixed with ashram, whereas Test No. 3 is an active ingredient and is 5.4 g. No. 3 was more economical.

  On the other hand, for Chigaya, only a high concentration of a mixed solution of ashram and trifloxysulfuron sodium salt (Test No. 3) showed a herbicidal effect. And Noshiba grew up without phytotoxicity. Chigaya and Noshiba of the same Gramineae, but the two-drug mixture was able to control Chigaya without damaging Noshiba.

Test Example 2 Field Test It was tested whether chigaya that grew in the substation green area could be controlled without affecting the growth of greening plants. The lawn surface of the substation green area was set to 1 block 5 m × 5 m, and herbicides were sprayed on the A block to the F block at a concentration of 3 levels. A predetermined amount of each drug shown in Table 5 was diluted with water and sprayed over the entire foliage. The amount of sprayed water was 100 L per 10a. A mowing investigation was conducted on the 109th day after the spraying treatment. In the section, 1 m ² having an average growth of chigaya was selected, and a 1 m side quadrat made of a wooden frame was placed. All the chigaya were cut and the number and yield of chigaya were measured. As a control, the same procedure was carried out in the non-herbicide chigaya between the compartments. The results are shown in Table 6.

From the results in Table 6, the number of strains in the low and medium concentration test plots was approximately 40% to 50% of the non-sprayed test plots. The yield was about 20% to 30% in the low-concentration test plots and about 30% to 40% in the non-spraying plots, and the low concentration had a slightly higher herbicidal effect than the medium concentration. The number of strains in the high-concentration test plot was as low as 20% compared to the non-spray plot, and the yield was about 10%. The growth of chigaya was remarkable in the medium and low concentration test plots, but there were very few chigayas in the high concentration test plots compared to the non-sprayed plots. However, it is estimated that 70-90 trees grow in 1 m ² , so the herbicide has not been sufficiently transferred to the rhizome, and as time passes, the rhizome runs sideways and produces new upright stems from the nodes. Therefore, it was thought that the distribution area of Chigaya was expanded to the periphery.

  Further, the herbicide was re-sprayed at a concentration of 3 levels in the A section to the F section after cutting, similarly to the first time for Chigaya. The state of chigaya was observed on the 35th, 56th, and 78th day after the spraying treatment. The results are shown in Table 7.

  From the above test results, the mixed solution of ashram and trifloxysulfuron sodium salt has a little herbicidal effect to the extent that it temporarily acts on the foliage of Tigaya in the first spraying treatment. By doing so, the above ground part of Chigaya withered and exhibited a herbicidal effect. In addition, after the two spraying treatments, the fawn had a mixture of yellowed and healthy leaves. In the first spraying treatment, no phytotoxicity was expressed in the fever.

  The method of the present invention can be applied to any place where perennial grass weeds are generated in the lawn, for example, power plant green space, management green space, factory green space, park, garden, various ball games, highway shoulder, cemetery. It can be applied to lawn growing places such as islands, golf courses, etc., but it is particularly suitable for weed control in power facilities green spaces, managed green spaces, factory green spaces, etc. that require safe equipment maintenance and reduction of green space management costs .

Claims (4)

N′-methoxycarbonylsulfanilamide sodium and 1- (4,6-dimethoxypyrimidin-2-yl) -3-[(3- (2,2,2-trifluoroethoxy) -2-pyridylsulfonyl) urea or A method for controlling perennial gramineous weeds in lawn, characterized by spraying the salt. The method according to claim 1, wherein the perennial grass weed is Chigaya. The method according to claim 1, wherein the perennial grass weed is Merikenkarkaya. N'-methoxycarbonylsulfanilamide sodium 33.3-333 ml / 10a and 1- (4,6-dimethoxypyrimidin-2-yl) -3-[(3- (2,2,2-trifluoroethoxy)- The method according to claim 1, wherein 2-pyridylsulfonyl) urea or a salt thereof is sprayed in an amount of 0.72 to 6.48 g / 10a.