JPS59204103A - Agent for reducing chemical injury and herbicide with chemical injury reduced - Google Patents

Abstract

PURPOSE:An agent for reducing chemical injury that contains, as an active ingredient, 1,2-benzoisothiazole-3(2H)-one-1,1-dioxide, thus showing high chemical injury reduction in a specific haloacetanilide herbicide, and the titled herbicide containing the same. CONSTITUTION:The objective agent contains, as active ingredients, 1,2-benzo- thiazol-3(2H)-one-1,1-dioxide which shows an effect of controlling rice blast or a compound of formula I (R is lower alkyl, lower alkenyl), or its salt which is known as an agent for controlling rice blast. These chemicals are used as an agent for reducing chemical injury caused by a haloacetanilide of formula II(R1, R2 are lower alkyl; R3 is 1-4C alkyl; A is methylene chain or ethylene chain or ethylene chain substituted with 1-2 methyl groups), which is known as a herbicide, and applied to a wide range of crops such as paddy-rice plant or corn to which the compond of formula II has been or will be applied. Further, the above active ingredient may be combined with the compound of formula IIto give a herbicide with chemical injury reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a compound of the general formula (II) (wherein R1 and R represent a lower alkyl group, and R3
is an ethylene chain substituted with two methyl groups). More specifically, 1,2-benziisothiazole-3 (21
()-one-1,1-dioxide or rumors thereof, or phytotoxic 1'4T'It agents represented by the general formula (I) Oi (in the formula, 1% represents a lower alkyl group or a lower alkenyl group), and this This relates to a herbicide containing.

Herbicides use selectivity to control harmful weeds in areas where useful crops are grown by chemical means, but there are few that show inherent selectivity between crops and weeds, and many Selectivity is achieved by utilizing differences in the growth stages of crops and weeds, differences in the position of seeds of crops and weeds in the soil, and differences in attachment on the leaf surface. Therefore, depending on the type of soil, temperature, weather conditions such as rain gauges, dosage, etc., chemical damage, which is an undesirable side effect, often occurs. This applies to many herbicides, such as triazine, urea, carbamate, phenoxy, phenol, and acetanilide herbicides.

For this reason, a lot of research has been done in the past on phytotoxicity reducers for these herbicides, such as EPTC, a corn herbicide.
N,N-diallyl-2,2-dichloroacetamide II, which has a phytotoxicity reducing effect on (S-ethyl-N,N-di(n)-propylthiol carbamate), Weed
5science 21(4), 292-295(1
973)) and alachlor (N-methine methyl-2,
1,8-naphthalene fan hydride (Weed 5science 22(1), 86-
90 (1974)) are known.

Haloacetanilide represented by the general formula (Ii), which is already known to be a useful compound as a herbicide (Japanese Patent Publication No. 48-37820, Japanese Patent Publication No. 49-54527), is also useful as a herbicide for various ponds. may cause drug damage.

The present inventors have developed a herbicide phytotoxic agent of no-roacetanilide represented by the general formula (1), and have developed It is known as a rice blast control agent represented by the dioxide or its salt or the general formula (I)
It was found that the compound No. 080) did not have a significant R-reducing effect. Crops that do not suffer from the phytotoxicity 11 radius reduction effect of this compound include paddy rice and other crops to which the herbicide represented by formula (II) can be applied, such as corn, wheat, barley, beer barley, upland rice, soybeans, cotton, They range from a wide range of crops, including peanuts and sugar beets.

The 1,2-benzothiazole-3(21()-one-1,1-dioxide, its salt, and the compound represented by the general formula (I) used as a drug harm reducer in the present invention are effective for controlling rice blast disease. Not known about effectiveness.

Compounds that can be used as the drug-toxicity reducing agent of the present invention include those shown in the following table.

([2 compound 2 1,2-benziisothiazole-3(2
H)-one-1,1-dioxide sodium compound 5
3-(11-butoxy)-1,2-benziisothiazole-1,1-dioxide 96
°C The phytotoxicity reducing agent of the present invention can reduce the phytotoxicity of herbicides in various ways.

That is, soybeans can be sown in soybean cultivation areas, and the haloacetate can later be treated with a phytotoxicity reducing agent, or the seeds can be coated with a phytotoxicity reducing agent.

Alternatively, the drug-toxicity reducing agent can be uniformly mixed with a suitable carrier, an activator, a binder and a binder added thereto, and the mixture can be made into granules for use.

The drug safety agent of the present invention can also be used in the form of an emulsion, a wettable powder, a powder, a liquid, or a flowable formulation.

The amount of drug harm reducer to be used is... Roacetani IJ Do 1
The amount is 0.01 to 5 parts by weight, but the optimum amount should be determined on a case-by-case basis depending on the type of acetanilide used and the target crop.

The action of haloacetanilide herbicides is said to be due to the inhibition of tannin biosynthesis, but regarding drug-induced symptoms,
For example, in the case of paddy rice, symptoms such as reduced plant height, inhibition of new leaf extraction, and shrunken stools are observed, and in severe cases, the yield can be significantly affected. In this case, if 11 of the present invention is applied at the same time to the herbicidal disease, the above-mentioned symptoms of herbicidal damage will be significantly diminished, or no symptoms of herbivorous damage will be observed at all, without any effect on the herbicidal effect, resulting in good results on the yield of paddy rice. bring.

The herbicide for reducing phytotoxicity q of the present invention contains both the acetanilide represented by the above general formula (fi) and the above-mentioned phytotoxicity reducing agent of the present invention.

Examples of the acetanilide represented by the general formula (TI) include those shown in the following table.

Compound symbol Chemical name Glaze, Ya (θdo, tun) Compound J) 2-chloro-N-(
2-works-6-methy/lephenyl)-N-(2-methoxy-1-methylethyl)7-1=)7mi)”
(100°Ω'0,OOlmml
(g) In the herbicide for reducing phytotoxicity of the present invention, the general formula (1
The above-mentioned phytotoxicity reducing agent is contained in the range of 0.01 to 5 parts by weight per 1 part by weight of noroacetanilide represented by (2).

Furthermore, depending on the dosage form, it can be made into granules, emulsions, wettable powders, and liquids by using carriers, active agents, dispersants, and binders.

Generally, in such a dosage form, the haloacetanilide and the mildly harmful agent in the above range are mixed, for example, in the form of granules, at a dosage of 0.
．． It contains 5 to 5% by weight, 1 to 10% by weight in emulsions, 2 to 20% by weight in wettable powders, and 0.1 to 1% by weight in powders.

The present invention will be explained below with reference to Examples and Test Examples.

Example 1 After mixing 45 parts of a chemical harm reducer granule compound, 70 parts of bentonite, 21 parts of talc, 1 part of sodium dodecylbenzenesulfonate, 1 part of polyoxyethylene alkyl allyl ether, and 2 parts of sodium ligninsulfonate, Example 2: 10 parts of granules are obtained by adding several parts of water, kneading, and granulating using a granulator in a conventional manner to obtain 10 parts of granules. 02 parts of compound, 61 parts of compound, 73 parts of bentonite Department,
After mixing 21 parts of talc, 2 parts of sodium ligninsulfonate, and 1 part of sodium dodecylbenzenesulfonate, an appropriate amount of water is added and kneaded, and the mixture is granulated using a granulator in the usual manner to form granules. get the part.

Example 1 Sub-Example 3 30.5 parts of chemical harm reducer powder compound and 99 parts of diatomaceous earth and clay mixture
．． 5 parts were mixed and ground to obtain 100 parts of powder.

Example 4 Phytotoxicity-reducing herbicide wettable powder Compound D 50 parts, Compound 22 parts, White Carbon 10
100 parts of a wettable powder were prepared by mixing and pulverizing 100 parts of a wettable powder by mixing and pulverizing 100 parts of a wettable powder, 33 parts of acetic acid, 3 parts of sodium ligninsulfonate, and 2 parts of sodium dodecylbenzenesulfonate.

Example 5 Phytotoxicity Reducing Herbicide Emulsion 40 parts of Compound A, 12 parts of Compound, 48 parts of orthoxylene and 10 parts of fatty alcohol polyglycol ether were mixed and dissolved to obtain 100 parts of an emulsion.

Test Example 1 Test on the effect of reducing chemical damage by seed coating In a greenhouse, each seed of corn (variety: Galten crosspantum), wheat (variety: Norin No. 27), and soybean (variety: Fukumusume) was coated with a powder containing 5 parts of Compound 3. The seeds were coated in powder at a ratio of 10 g to 1009 seeds, planted in a pot filled with sandy soil, treated with a prescribed amount of Compound A or Compound Ri on the next day, and conducted a sampling survey 400 days after the treatment. Table 1 shows the results of a comparison of the growth amount with seeds uncoated with a phytotoxicity reducer.

Trial and measurement 2 Test for the effect of reducing chemical damage by seedling nursery box treatment When paddy rice (variety: Koshihikari) grown in a seedling nursery box reached the 2.5 leaf stage, Compound 6 prepared as a granule of Group 5 was added at 50% per box. After 2 hours, three paddy rice plants were placed in a %, 000 Wagnerbott filled with sandy soil in advance, with the soil still attached, per pot.
The two plants were sown at a depth of 3 CrIL. On the 5th day after transplantation, granules of Compound I3 or Compound C were treated at a prescribed dose,
Table 2 shows the results of observation and investigation conducted on the 100th and 200th day after the treatment after growing in a greenhouse.

The classification of chemical damage to paddy rice is “severe damage” and “kennel”
There were six levels: ``Nakayoshi'', ``Small Hazard'', ``Minor Harm'', and [Harmless-1].

Table 2 Test Example 3 Field cultivation field test of herbicide containing chemical damage reducer Field field in which weeds naturally coexist was plowed and fertilized in the usual manner (
N, P, 0. .
After sowing corn, wheat, rice, cotton, and peanut seeds and covering with soil, 50% contains 2% phytotoxicity reducer.
A prescribed amount of the herbicide prepared as a permanent agent was applied. After processing 2
On the 55th day, the herbicidal effect on weeds and the chemical damage to crops were investigated, and the results were calculated into an index as shown below, which is shown in Table 3.

8 4-8 section 7 9-15% 00 Arrogant 6 16-25% 1 1-5 section 5 26-35% 2 6-10%4 36-4
5% 3 11-20%3 46-55% 4
21-30chi 2 56-65% 531chi or more 1 66-75% 075chi or more Test i Test 4 Paddy field test of herbicide with chemical harm reducer A rice field where paddy weeds are naturally mixed was tested using the normal method. Plowing, plowing
III! (N, P2O3, K, O each 1kg/a), plowing and leveling the land, 10 rn' (2,
5 m x 4 ni), each plant contains 3 young paddy rice seedlings of leaf age 2.5, with a ridge spacing of 30 yen and a plant spacing of 15 yen.
Transplanted with CTL. After transplanting, increase the water depth to 3 to 5 771
The herbicide prepared as a 5% granule containing 1 t of a chemical damage reducer was applied at a prescribed dose at the beginning of weed germination (3 days after rice planting) and at the 2-leaf stage of Japanese millet (10 days after rice planting) while maintaining the same conditions. On the 20th day after treatment, the herbicidal effect on weeds and phytotoxicity on crops were investigated, and the results were calculated into an index as described above, which is shown in Table 4.

Claims (1)

[Claims] (],) ]1.2-Benzisothiazole-3(2
H)-one-1,1-one oxide or a salt thereof, or - (wherein R represents a lower alkyl group or lower alkenyl group), represented by the general formula (II) (wherein l(
1 and I (represents a lower alkyl group, and R3 represents an ethylene chain substituted with two methyl groups). (2) 1,2-Benzisothiazole-3(2H)
-one-1,1-dioxide or salt, or a compound represented by general formula (I) SOλ (wherein R represents a lower alkyl group or lower alkenyl group) and general formula (II) (wherein R
1 and Xin represent a lower alkyl group, R. Two methyl groups (indicates substituted ethylene)
A herbicide with reduced phytotoxicity containing a haloacetanilide represented by: