JPH0515682B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to herbicides. Specifically, the herbicidal active ingredient is N-methoxycarbonylsulfanilamide (hereinafter referred to as compound A).
or an alkali metal salt thereof and 2,6-dichlorobenzthioamide (hereinafter referred to as compound P), the herbicide is particularly suitable for weed control in Japanese lawns. Japanese grass is cultivated everywhere, including golf courses, parks, and home gardens, and it goes without saying that it is important, but in order to achieve its cultivation purpose, it must be cut, cultivated, and cultivated.
Daily management such as fertilization and extermination of pests and weeds is necessary, and weed control is particularly important; if care is taken, the area will quickly turn into a weedy area. Weeds that invade lawns can be roughly divided into annual weeds of the Poaceae, broad-leaved, and Cyperaceae families that propagate by seeds, and perennial broad-leaved weeds of the vegetatively propagated family of the Cyperaceae family.
In areas of the Equisetaceae family or recently established areas, the perennial Chigaya grass of the Poaceae family may be invading the area. There are many weed species that invade lawns, and each species has a different physiological ecology. On the other hand, there are many types of herbicides, but they can be roughly divided into soil treatments that control annual weeds when they are seeds, and hormone-type foliage treatments that selectively kill broad-leaved weeds. However, recently there have been drugs that selectively control weeds of the Cyperaceae family, drugs that are applied to large perennial grasses, and weeds that belong to the Poaceae family, which is the same as lawns, and have reached their annual or biennial growing season. The use of selective control agents that are sprayed at different times of the year is also steadily increasing. These chemicals must be used appropriately, depending on the weed species, growth stage, soil quality, temperature, and lawn condition, including the selection of chemicals, treatment timing, amount of treatment, and treatment method. In addition, in many cases, a mixture of chemicals is sprayed to compensate for the shortcomings of each chemical or to save labor. Mixed spraying depends on the appropriate combination of chemicals and the conditions of the spraying area.
There are many cases where there are great benefits. However, depending on the combination of chemicals, the appropriate treatment period differs, so it may not be as effective as expected, or it may not be as effective at killing weeds as when used alone due to antagonistic effects, or it may become too strong and cause serious damage to the lawn. It often causes damage. Specifically, there are many combinations of different types of hormones or soil treatment agents and hormones, but the latter is difficult to use because it is not as effective as expected and increases the risk of drug damage. In addition, although other combinations may be compatible, there is no easy way to simultaneously control Japanese grass, including perennial grasses of the Poaceae, broadleaf, Cyperaceae, and Horsetail families, without adversely affecting Japanese grass. Compound A and its alkali metal salts according to the present invention can also be used as soil treatment agents, but they can be sprayed during the growing season of annual or perennial crabgrass and sycamore, which belong to the same grass family as lawns, to selectively kill these weeds. It has the characteristic of being able to control. However, A has a narrow herbicidal spectrum when used on lawns, and there are many grass species with low efficacy, such as annual and perennial broad-leaved weeds, and weeds of the Cyperaceae family. In addition, there are disadvantages such as the medicinal efficacy becomes inferior if the growth progresses too much, and it causes considerable damage to lawns if sprayed at high temperatures.Although it is a chemical with excellent characteristics, there are considerable problems depending on the location and conditions of use. There are restrictions. Furthermore, even if A and hormonal herbicides are used together, it is possible to expand the herbicidal spectrum to include annual broad-leaved weeds, but the effect may be lower on grassy weeds or on broad-leaved perennial weeds. Therefore, a wide spectrum of weed killing cannot be expected. Compound P according to the present invention is a herbicide that has been known for a long time, but currently it is only used in small amounts in non-agricultural lands, orchards, etc., and Japanese grass is resistant to this herbicide. Its action is originally a soil treatment agent, and it is non-selective and highly active on seeds, but its activity decreases rapidly during the weed growing season, especially on grass weeds. When the dosage is increased, it exhibits herbicidal activity against weeds and perennials during the growing season, but perennial grasses such as Miscanthus sinensis and Chigaya are resistant to P, and it is difficult to kill them down to the roots. Although it is possible to apply P alone to Japanese grass, it is difficult to control gramineous weeds once they have entered the growing season, and other species require a large amount of chemical, so it is technically and cost-effective. However, there are no particular advantages compared to current soil treatment agents and foliage treatment agents. However, in the present invention, by mixing Compound A, its metal salt, and Compound P in relatively low doses, the effect against weeds is dramatically increased to a degree that would be unimaginable if each was used alone. The grass spectrum will also be greatly expanded. In addition, there is a wide range of suitable treatment periods, from soil treatment before weeds emerge to foliage treatment once weed growth has progressed. Moreover, the chemical damage to Japanese grass is the same as that caused by the amount of compound A, and the amount of compound P is related to the effect on weeds, but not to the chemical damage to Japanese grass. In other words, the selectivity between Japanese grass and weeds is very wide.
This is why all weeds can be eradicated with one spraying. In the case of soil treatment, compound A is applied before the grass sprouts.
The active ingredient is 350g to 450g/10a, but for foliage treatment, 150g to 250g/10a is used except during high temperature periods.
Use degrees. In the present invention, in order to avoid phytotoxicity caused by Compound A and to increase the herbicidal effect of compound A, in the soil treatment, the amount is in the range of 150g to 300g/10a.
For foliage treatment, the dosage can be selected from a wide range of 30 to 200g/10a depending on the situation. On the other hand, Compound P can be used in a wide range of doses, from 50 to 1000 g/10a, depending on the weed species, growth level, other conditions, and purpose; 500 ~ only when particularly strong weeds such as Chigaya are growing
Usage amount is 1000g/10a, usually preferably
It is 100-500g/10a. In addition, synergistic effects have been observed in a wide range of 1:20 when used together, making it possible to select appropriate dosages and mixing ratios depending on the purpose. In carrying out the present invention, it may be sprayed on-site using tank mixes, or it may be made into an integrated formulation. In the case of an integrated formulation, an inert solid carrier or an inert organic solvent may be used as a carrier. Examples of dispersants and emulsifiers include anionic and nonionic surfactants. Formulation Example 1 Wettable powder Add 3 parts of white carbon and 7 parts of kaolin clay to 90 parts of Compound P, finely pulverize with a jet mill, 55.6 parts of this, 38.4 parts of kaolin clay, and 4 parts of Solpol 5039 (Toho Chemical trademark) as a dispersant. 1 part and 2 parts of Solpol 5050 were added and mixed well with a mixer to obtain a 50% wettable powder of Compound P. (All parts indicate parts by weight, and the same applies hereinafter.) [This is referred to as Formulation No. 1] Formulation Example 2 Granules Compound A was ground with a mill, and 3 parts of this, 60 parts of clay, and 37 parts of bentonite were mixed. The mixture was mixed well, water was added, kneaded, granulated using a granulator with a 0.7 mm screen, and dried to obtain 3% Compound A granules.
[Referred to as Formulation No. 2] Formulation Example 3 Granules Mix 10 parts of a 50% hydrating powder of Compound P, 60 parts of clay, and 30 parts of bentonite well, add water, knead with a kneader, and then use a granulator. The mixture was dried to obtain 5% Compound P granules. [Referred to as Formulation No. 3] Formulation Example 4 Mixed hydrating powder Grind the Na salt of Compound A with a grinder, dry it thoroughly, and mix 15 parts of this with 80 parts of a 50% hydrating powder of Compound P.
and 5 parts of kaolin clay were mixed well to form compound A.
A hydrating powder containing 15% of Na salt and 40% of compound P was obtained. [Referred to as Formulation No. 11] Formulation Example 5 Mixed Granules Compound A was pulverized using a grinder, and 2 parts of this were thoroughly mixed with 12 parts of a 50% hydrating powder of Compound P, 60 parts of clay, and 26 parts of bentonite. Then, water was added thereto, kneaded in a kneader, granulated in a granulator, and dried to obtain granules containing 2% of compound A and 6% of compound and compound P. [Referred to as Formulation No. 12] Formulation Example 6 Mixed Fine Granules While stirring 90 parts of a mixed carrier of Tankal fine particles and zeolite fine particles at a ratio of 2:1 in a speed kneader, 1.5 parts of Na salt of Compound A and 2 parts of polyoxyethylene dodecyl ether were added. 50% hydrating agent 6 of Compound P was coated dropwise with an aqueous solution dissolving
After adding 0.5 parts of white carbon to adjust the moisture content, the mixture was taken out and dried to obtain fine granules containing 1.5% of the Na salt of Compound A and 3% of Compound P. [Referred to as Formulation No. 13] Test Example 1 Fill a 100 cm ² clay pot with diluvial volcanic ash soil, sow the seeds of crabgrass, and thin out to 10 plants per pot at the early stage of growth to give 4 to 4.5 leaves. At the time of 8 to 12 cm, an aqueous solution of the Na salt of Compound A and a hydrating agent of Compound P were prepared to a predetermined concentration, and used as a spreading agent.
Polyoxyethylene dodecyl ether was added at a spraying concentration of 300 ppm, and was uniformly sprayed using a spray gun for both single and mixed applications at a liquid volume of 100 per 10 a. Table 1 shows the results of an observational survey conducted one month after the spraying. The evaluation criteria are as follows. 0: Same as no treatment 2: 20% control 4:40 〃 6:60 〃 8:80 〃 10: Complete control

[Table] Test Example 2 Orifolia foliage treatment test A hole was made in the bottom of a 60cm x 90cm wooden box, filled with diluvial volcanic ash soil to a depth of 15cm, and 10cm x 10cm pieces of Oriola oriflora cut grass were placed at intervals. When the leaves have been densely regenerated, a diluted solution of the Na salt of Compound A and Compound P prepared in the same manner as in Test Example 1 was added in a volume of 100/10A, taking care not to scatter it to the surrounding area. ,
The area was surrounded by a 12cm x 12cm PVC frame, and a small spray gun was used to uniformly spray the area. Table 2 shows the results of an observational survey conducted one month after the spraying. The evaluation is as follows. 0: Harmless 2: 20% damage (slight damage) 4:40 〃 (medium) 6:60 〃 (large) 8:80 〃 (severe) 10: Completely dead

[Table] Test Example 3 Treatment with granules (Mehishiba) A 3% granule of Compound A [Formulation No. 2] was applied to the growing season (3rd to 4th leaf stage) of Mehishiba grown in the same manner as in Test Example 1.
A predetermined amount of 5% granules (Formulation No. 3) of Compound P (preparation No. 3), both alone and in combination, were sprinkled on the surface of the pot so as to spread as evenly as possible within the pot. After the granule treatment, water management was carried out to minimize differences in the dryness and wetness of the soil between the pots, and an observational investigation was conducted one month later. The results are shown in Table 3. The evaluation was the same as in Test Example 1. Test Example 4 Treatment with granules (Nosiba phytotoxicity) Using Nosiba grown in the same manner as Test Example 2, 3% granules of Compound A [Formulation No. 2] and 5% granules of Compound P [Formulation No. 3] Table 4 shows the results of a predetermined amount of 100% treated alone and in combination, and an observational investigation conducted one month later. The evaluation was the same as in Test Example 2.

【table】

[Table] Test Example 5 Field test (tank mix) A test plot of 10 cm ² was set up in a weedy grass field, and the Na salt of compound A and compound P were tested.
Polyoxyethylene dodecyl ether was added as a spreading agent to a predetermined diluted solution to give a spraying concentration of 300 ppm, and the solution was uniformly sprayed within the plot using a hand pressure sprayer at a volume of 200 ppm per 10 acre. Table 5 shows the results of an observational survey conducted one month after the spraying. The investigation was conducted based on the standards of Test Examples 1 and 2 for each type of grass, while comparing with the untreated plot. The status of weeds at the time of treatment was as follows.

【table】

[Table] Test Example 6 Field Test (Integrated Formulation) A test area of 1 6 m ² was set up in a weedy grass field, and formulation No. 11 of wettable powders, granules, and fine granules were tested.
Add the specified amount of 12 and 13 to the hydrating agent with a liquid volume of 200/10a,
A spreading agent was added and the granules and fine granules were uniformly spread within the plot using a pressure sprayer, and the granules and fine granules were sown by hand. Table 6 shows the results of an observational survey conducted one month after spraying. The evaluation was the same as Test Example 5.

【table】

【table】

Claims (1)

[Claims] 1. A herbicide containing N-methoxycarbonylsulfanilamide or an alkali metal salt thereof and 2,6-dichlorobenzthioamide as herbicidal active ingredients.