JPH0524881B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention provides an improved herbicidal composition comprising: 2
-(4-isopropyl-4-methyl-5-oxo-2-imidazolin-2-yl)nicotinic acid, its allyl metal salt, lower alkyl (C1 _{- C4} ) ester or lower alkyl ( _C1 - _C4 ) A herbicidal composition containing an amine salt (hereinafter referred to as compound group A) and methyl N-(4-aminophenylsulfonyl) carbamate or an alkali metal salt thereof (hereinafter referred to as compound group B). It is something. That is, the main object of the present invention is to increase the value of a slow-acting non-agricultural herbicide by making it continuous-acting without losing its residual effectiveness. Compound A group according to the present invention is a powerful herbicide that exhibits herbicidal activity even at very low doses. Its characteristics include a wide spectrum of cereal grasses, a long weed suppression period, and high efficacy at low dosages, making it suitable as a herbicide for non-agricultural land. By the way, compound A group is very slow-acting, and it often takes several months to completely kill the grains, especially for perennial plants that have grown a little. This is considered to be a drawback of this group of compounds. On the other hand, the compound B group according to the present invention has properties such as being highly effective against certain perennial weeds, having a relatively short residual effect, and being extremely slow-acting. Used on lawns, sugarcane fields, orchards, etc. However, it cannot be said to be suitable as a herbicide for non-agricultural land, for example, because it is not effective against harmful grasses such as silver grass, even when applied in large amounts, and the weeding period is short. Weed control in non-agricultural land is usually carried out after weeds are left until they emerge and grow, and it is essential that the weeds are treated under conditions that maximize the herbicidal activity of the chemicals used. is not limited. on the other hand,
Many of the purposes for weeding non-agricultural land include environmental beautification, crime prevention, and fire prevention, and after chemical treatment, immediately
It is hoped that the herbicidal effect will appear. Note that weeds controlled with compound A group die in a so-called damping-off state, but this is not suitable for the purpose of crime prevention and fire prevention. When the composition of the present invention is used to control weeds, dead weeds lie down and rot, which further increases the practical value as a weed killer for non-agricultural land. The practical usage amount of the composition according to the present invention is A
For both the group compound and the group B compound, the amount is suitably 0.1 to 1 g (acid equivalent) per m ² , and preferably 0.2 to 0.6 g. For the composition of the present invention, an appropriate compound is selected depending on the purpose by comparing the physicochemical properties of each compound and the dispersion conditions. It can be made into granules, etc. Note that the effects of the present invention are exhibited regardless of the drug absorption site of the weed. That is, even in a dosage form that hardly adheres to the leaves and foliage of weeds, such as granules, rapid effects can be clearly observed. in this case,
The addition ratio of compound group B to group A needs to be higher than when the present composition is used as a foliar spray. Extending agents include water, organic solvents, inert mineral powders and granular carriers, and dividing agents or spreading agents can be selected from anionic and nonionic surfactants. Furthermore, other herbicides and the like can be added to the composition of the present invention, if necessary. The present invention will be explained below using test examples and examples. The names of the compounds are shown in the table and in the following, each compound will be referred to as a compound number.

【table】

【table】

[Table] Test Example 1 In a 100 cm ² clay pot, a diluted solution or a mixed solution of each compound was sprayed on the 5-leaf stage, approximately 20 cm tall, of crabgrass that had been grown in advance, and the grain speed was observed and investigated. did. The diluent concentration is the concentration converted to free acid. The amount of water sprayed was 100 ml/ ^m2 , and the spraying treatment was carried out using a spray gun. The results are shown in the table. The evaluation criteria are as follows. 0: Same as no treatment 2: 20% control 4: 40%〃 6: 60%〃 8: 80%〃 10: Complete control As a result, compared to the single application of each, the combined application of the present invention resulted in the expression of activity and It can be seen that completion is much faster.

【table】

【table】

[Table] Test Example 2 Examination of the effect of additives in stem and leaf treatment. Diluted solutions No. ² and No. 12 were used alone or in combination on crabgrass that had been grown in advance to a 4- to 5-leaf stage of 15 to 20 cm in a 100 cm 2 clay pot. , using a spray gun with a water volume of 100ml/ ^m2 ,
Sprayed. The results of the investigation two weeks after the treatment are shown in Table 1. The evaluation criteria were the same as in Test Example 1. From the results in the table, it is clear that the herbicidal composition of the present invention has a synergistic effect.

[Table] Test example 3 Field test Select priority areas for grass perennial grasses such as Miscanthus sinensis and Chigaya, which are representative harmful grasses in non-agricultural land, and priority areas for broad-leaved perennials Verbata stingata and Mugwort.
A test area of 2.5 m x 2.5 m was set up, and No. 4 and No. 12, single and mixed, were uniformly sprayed over the entire area using a water sprayer at a water volume of 300 ml/m ² . The spray was applied on July 5th, and observation and investigation were conducted after 2 weeks, 1 month, 2 months, and 3 applications. The status of weeds at the time of treatment was as follows. Grass species name Area occupancy Plant height (%) (cm) Miscanthus 50-80 120-150 Chigaya 60-80 60-80 Goldenrod 50-70 70-100 Mugwort 40-60 40-70 Evaluations are as in Test Example 1 Similar evaluation criteria were used. The results are shown in Tables-1 and -2. These results show that the composition of the present invention is far superior to each of the compositions used alone, both in terms of immediate effect and final effect.

【table】

【table】

[Table] Test example 4 Effect of granules Grow crabgrass to the 4-leaf stage and approximately 15 cm in a 100 cm ² clay pot filled with soil from a volcanic ash field, and apply No. 6 1% granules on the soil surface of the pot. No. 12 2% granules were uniformly distributed by hand, both alone and in combination. After the granule treatment, artificial rain was applied 1 to 3 times a day depending on the dryness and humidity of the soil, and growth was controlled in a state with slightly high soil moisture, and an inspection was conducted 20 days after the treatment. The evaluation criteria were the same as in Test Example 1. The results are shown in the table. This result shows that the herbicidal composition of the present invention is also excellent in quick-acting properties when used in granules, which is generally said to be difficult.

[Table] Test Example 5 On-site test using granules A test plot of 2 m x 2 m was set up in a cultivated area with many horsetails, and the composition of the present invention and each single agent granule were distributed uniformly within the plot by hand. Spread. The spraying took place on August 2nd, and inspections were conducted two weeks, one month, and two months later. The evaluation criteria were the same as in Test Example 1. The results are shown in the table. As a result, it was demonstrated that even the integrated formulation of granules exhibits excellent fast-acting properties and synergistic effects.

[Table] Test example 6 Field test using fine grains A 7m x 7m test plot was set up in a flourishing area of perennial grasses such as pampas grass, Japanese grass, Japanese grass, and mugwort, which had been mowed down and regenerated before the end of the rainy season, as well as ragweed and hackberry. Microgranules of the composition of the present invention containing 2% of Compound No. 4 and 3% of No. 12 were prepared at ¹⁰ g, 20 g,
They were evenly distributed by hand within the ward. Sprayed on August 2nd, 1
An observational investigation was conducted after a month or two. The evaluation criteria were the same as in Test Example 1. The results are shown in the table. The herbicidal composition of the present invention reliably exhibited herbicidal effects against a wide variety of weeds after one month. In addition, the dead weeds were not in a standing state but in a lodging state, which was a satisfactory result.

【table】

[Table] Example 1 Wettable powder Kaolin clay and white carbon were added to the raw materials of compounds A and B, and after using a crusher, a powdered surfactant was added, and the mixture was thoroughly stirred and mixed. A wettable powder containing 25% of No. 1 and 20% of Compound No. 11 was obtained. Compound No. 1 25 parts by weight 〃 No. 11 20 〃 Kaolin clay 45 〃 White carbon 5 〃 Solpol 5039 (Toho Chemical trademark, anionic surfactant) 4 〃 Ravisol BB-75 (NOF trademark, anionic surfactant) Active agent) 1 〃 Example 2 Liquid agent The active ingredients of compound A group and B group and a surfactant were dissolved in ion-exchanged water, and compound No. 4 was dissolved in 12
A solution of the composition of the present invention containing 18% of Compound No. 12 was obtained. Compound No. 4 12 parts by weight 〃 No. 12 18 〃 Polyoxyethylene aryl ether 5 〃 Ion-exchange treated water 65 〃 Example 3 Granules Bentonite, the active substance of compound group A and group B
Clay and surfactant are mixed, water is added, kneaded uniformly with a kneader, granulated using a granulator, and dried with air to create a product containing 1% of Compound No. 6 and 2% of Compound No. 11. Granules of the composition of the present invention were obtained. Raw material of compound No. 6 1 part by weight 〃 Raw material of No. 11 2 〃 Dioctylsulfosuccinate 1 〃 Bentonite 40 〃 Clay 56 〃 Example 4 Microgranules The raw materials of compound group A and group B were diluted with water. In a speed kneader, pour into the fine zeolite particles (48 to 150 mesh) being stirred, add a diluted surfactant solution in water, continue stirring, add white carbon, take out, and dry with air. Fine granules of the composition of the present invention containing 2% of Compound No. 4 and 3% of Compound No. 12 were obtained. Raw material of compound No. 4 2 parts by weight Raw material of No. 12 3 Fine zeolite 90 Polyoxyethylene dodecyl ether 2 White carbon 3 Effect of the invention The herbicidal composition of the present invention can be used individually. It has far superior fast-acting and synergistic effects, and will surely wilt harmful grasses in non-agricultural land within a month. Also,
As mentioned above, it is fast-acting, but also has a residual effect. Moreover, the dead weeds are not in a standing state but in a fallen state, which has advantages in environmental beautification, crime prevention, and disaster prevention.

Claims (1)

[Claims] 1 2-(4-isopropyl-4-methyl-5-
oxo-2-imidazolin-2-yl) nicotinic acid, its alkali metal salts, lower alkyl (C ₁ -
A herbicidal composition comprising a _C4 ) ester or a lower alkyl ( _C1 to _C4 ) amine salt and methyl N-(4-aminophenylsulfonyl)carbamate or an alkali metal salt thereof.