JPH09143006A - Phytotoxicity reduction of herbicide - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a phytotoxicity reducing agent useful in using a herbicide for corn, a soil treating agent and a foliage treating agent by using an adjuvant having a concentration at spraying within a specified range. SOLUTION: This phytotoxicity reducing agent is used for a non-tilled cropping and is composed of at least one kind of compound selected from a compound of formula I (an excellent herbicide with a small dose and exhibits high safety to corn), flumetsulam of formula II (a soil treating and foliage treating agent for corn) and prosulflon of formula II (a foliage treating agent for corn). A concentration of the adjuvant in the phytotoxicity reducing agent in spraying is made to 500-40,000ppm, especially 1,000-25,000ppm. A surfactant (e.g., a fatty sorbitate, a fatty acid salt or a quaternary ammonium salt), a mineral oil (e.g., a paraffin oil) and a vegetable oil (e.g., a soybean oil), etc., are used as the adjuvant in the phytotoxicity reducing agent.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a phytotoxicity reducing agent for a herbicide composition, a phytotoxicity reducing composition, and a phytotoxicity reducing method.

[0002]

[Prior art and problems]

1. Traditionally, tillage cultivation has been considered to have effects such as mechanical weed control, removal of plant residues on the ground surface, aeration of soil, pest control and suppression of disease outbreak. However, while these effects are temporary, the work imposes heavy labor on the farmer,
Moreover, it has become clear that this cultivation form is the main factor that causes soil to be washed away by wind and heavy rain.

On the other hand, chemical pesticides in recent years are an alternative to conventional mechanical control of outbreak of weeds, pests and diseases.
This has led to the development of no-tillage cultivation methods with minimal or no tillage. No-till cultivation can reduce working hours, reduce costs, and significantly reduce the risk of soil loss, so it is considered to be an important method for environmental conservation. (No-Tillage Farming, editor: Debbie Lessiter, 1982, No-till Farmer Inc.).

However, due to this change in cultivation form, the method of using herbicides is also changing. That is, since weeds are constantly growing under no-tillage cultivation, many foliar treatment agents are used in addition to soil treatment agents, so the number of times of use of herbicides increases, and in terms of cost. The benefits are diminishing. Therefore, there is a demand for a herbicide capable of controlling not only germinated weeds but also ungerminated weeds at the time of sowing, that is, a soil-treated herbicide having a foliar treatment activity suitable for no-tillage cultivation conditions. 2. Compound (A):

[0005]

Embedded image

Is a compound described in JP-A-60-208977, which has an excellent herbicidal effect at a low dose as compared with conventional herbicides, and has high safety against crops, especially corn. Have. Compound (B):

[0007]

Embedded image

Is a general name of flumetsulam, and is used as a soil treatment agent and a foliar treatment agent for corn. Formula (C):

[0009]

[Chemical 6]

Is a general name of prosulflon and is used as a foliar treatment agent for corn. When these herbicides are used as soil treatment agents under no-tillage cultivation conditions, they may cause phytotoxicity to corn, and improvement is required. 3. In no-tillage cultivation, the concentration when sprayed is about 10-250p
A pm adjuvant is used as a component of the formulation for stabilizing the formulation, improving herbicidal efficacy, and the like.

[0011]

Means for Solving the Problems Occurrence of phytotoxicity on crops by soil treatment of compound (A), compound (B) or compound (C) is usually caused when these herbicides are distributed in large amounts around crop seeds. It is thought to be more likely to occur in In particular, in the case of no-tillage cultivation, unlike ordinary tillage cultivation, the soil is very hard and the drug is less likely to diffuse into the soil, so it is likely to be distributed around the crop seeds and phytotoxicity is likely to occur. To be

The present inventors have found that an adjuvant spreads a drug on a plant surface and evenly adheres it to the plant surface, and retains it without being washed away by wind and rain (Agricultural Handbook 1994,
Using the Japan Plant Protection Association), the chemicals are retained in the plant residues on the surface that are peculiar to no-tillage cultivation, and the chemicals are gradually discharged to the ground surface. Then, compound (A), compound (B) or compound ( The present invention has been completed by finding that the phytotoxicity of the crop C) is reduced.

The present invention is selected from compound (A), compound (B) and compound (C) in no-tillage cultivation.
It is usually used for more than one compound and has a concentration of 50 when sprayed.
0-40,000 ppm, preferably 1,000-2
A phytotoxicity-reducing agent comprising an adjuvant of 5,000 ppm (hereinafter referred to as phytotoxicity-reducing agent of the present invention), used in no-till cultivation, selected from compound (A), compound (B) and compound (C) 1 When applied to one or more compounds, the concentration when sprayed is usually 500 to 40,000 ppm, preferably 1,
From the compound (A), the compound (B) and the compound (C) in a phytotoxicity-reducing composition (hereinafter referred to as a phytotoxicity-reducing composition of the present invention) to which an adjuvant having an amount of 000 to 25,000 ppm has been added, The concentration when applied to one or more selected compounds is usually 500 to 40,000 ppm,
Preferably, it is a drug damage reducing method (hereinafter referred to as the drug damage reducing method of the present invention) in which an adjuvant having an amount of 1,000 to 25,000 ppm is added.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The adjuvant used as the drug damage reducing agent of the present invention will be described. Adjuvants include surfactants, mineral oils and vegetable oils. Examples of the surfactant include nonionic surfactants, anionic surfactants, and cationic surfactants.

As the nonionic surfactant, sorbitan fatty acid ester, glycerin fatty acid ester, fatty acid polyglyceride, fatty acid alcohol polyglycol ether, acetylene glycol, acetylene alcohol,
Examples thereof include oxyalkylene block polymers, polyoxyethylene alkylaryl ethers, polyoxyethylene glycol alkyl ethers, polyoxyethylene fatty acid esters, polyoxyethylene hydrogenated castor oil, polyoxypropylene fatty acid esters, and silicone surfactants.

As the anionic surfactant, a fatty acid salt,
Benzoate, alkyl sulfosuccinate, polycarboxylate, dialkyl succinate, alkyl sulfate, alkyl sulfate, alkyl sulfate, alkylaryl sulfate, alkyl diglycol ether sulfate, alcohol sulfate, alkyl Sulfonates, alkylaryl sulfonates, lignin sulfonates, alkyl diphenyl ether sulfonates, polystyrene sulfonates, alkyl phosphate ester salts, alkyl aryl phosphates, styryl aryl phosphates, polyoxyethylene alkyl ether sulfates Ester salt, polyoxyethylene aryl ether sulfate ester salt, polyoxyethylene alkyl aryl ether sulfate ester salt, polyoxyethylene alkyl aryl ether phosphate salt,
Examples thereof include polyoxyethylene alkylaryl ether phosphate ester salts and salts of naphthalene sulfonic acid formalin condensates.

Examples of cationic surfactants include quaternary ammonium salts and polyoxyalkylene alkylamines. Examples of the mineral oil include paraffin oil, isoparaffin oil, aromatic hydrocarbon and the like. Examples of vegetable oils include soybean oil, rapeseed oil, castor oil, machine oil and the like.

One or more of these can be used as an adjuvant. Next, the phytotoxicity-reducing composition of the present invention will be described. In addition to one or more compounds selected from the compound (A), the compound (B) and the compound (C) and an adjuvant, various auxiliary agents necessary for a usual preparation may be appropriately mixed. Examples of various auxiliaries include solid carriers, organic solvents, water, inorganic salts, fillers, binders, oil absorbing agents, disintegrating agents and the like.

In addition to one or more compounds selected from the compound (A), the compound (B) and the compound (C), other herbicide components may be contained, and in this case, the compound (A) and the compound ( An excellent drug damage reducing effect can be expected for one or more compounds selected from B) and the compound (C). Other herbicidal components include, for example, 2-chloro-4-ethylamino-6-isopropylamino-1,3,5-triazine (generic name: atrazine), 2- (4-chloro-6-methylamino-1, 3,5-Triazin-2-yl) amino-2-methylpropionitrile (generic name: cyanadine), 2-chloro-4,6-bis (ethylamino)-
1,3,5-triazine (generic name: simazine), 2-chloro-2 ′, 6′-diethyl-N-methoxymethylacetamide (generic name: alachlor), 2-chloro-2′-
Ethyl-N- (2-methoxy-1-methylethyl)-
6'-methylacetanilide (generic name: metolachlor), N- (butoxymethyl) -2'-ethyl-6'-
Methylacetamide (generic name: acetochlor), N-ethylpropyl-3,4-dimethyl-2,6-dinitroaniline (generic name: pendimethalin), 2-chloro-N-
(4-Methoxy-6-methyl-1,3,5-triazin-2-yl-aminocarbonyl) benzenesulfonamide (generic name: chlorosulfuron), 2- (3- (4-methoxy-6-methyl- 1,3,5-Triazin-2-yl) ureside sulfonyl) methyl benzoate (generic name: metsulphon-methyl), 2- (3- (4-chloro-6-methoxypyridin-2-yl) ureside Sulfonyl) benzoic acid ethyl (generic name: chlorimuron-ethyl), 3- (6-methoxy-4-methyl-1,3,5
-Triazin-2-yl) -1- (2-chloroethoxy) phenylsulfonyl) urea (generic name: triasulfuron), 3-isopropyl-1H-2,1,3-benzothiadidiazine-4 (3H)- On-2,2-dioxide (generic name: bentazone), 3,5-dibromo-4-
Hydroxybenzonitrile (generic name: bromoxynil
Octanoate), 5-ethyl-2- (4-isoluropyl-4-methyl-5-oxo-2-imidazoline-2-
Il) nicotinic acid (generic name: imazethapyr), 2- (4
-Isolurlopyr-4-methyl-5-oxo-2-imidazolin-2-yl) -3-quinolinic acid (generic name: imazaquin), 4-amino-6-tert-butyl-3-methylthio-1,2,4 -Triazin-4 (4H) -one (generic name: metribuzin), 2,4-dichlorobenzoic acid (generic name: 2,4PA), 5- (2-chloro-4-trifluoromethylphenoxy) -2-nitro Sodium benzoate (generic name: acifluorophen-sodium), 1-ethylcarbonylethyl 5- (2-chloro-4-trifluoromethylphenoxy) -2-nitro-benzate (generic name: lactofen), 2-chloro- 6- (4,6-dimethoxypyrimidin-2-ylthio) sodium benzoate (generic name: pyrithiopak-sodium) and the like can be mentioned, and one or more of these can be used. It may be mixed.

As the phytotoxicity-reducing agent, other agents having a phytotoxicity-reducing action can be mixed or used together. For example, N,
N-diallyl-2,2-dichloroacetamide (R-25
788), and in this case, a synergistic effect is obtained with respect to reduction of drug damage. The method for reducing phytotoxicity of the present invention is selected from compound (A), compound (B) and compound (C) 1
The following method is selected depending on the formulation form of the herbicidal composition containing one or more compounds. (1) A herbicide composition containing one or more compounds selected from the compound (A), the compound (B) and the compound (C), and the phytotoxicity reducing agent of the present invention in 100 to 1,000 liters / hectare of water. A method of adding an aqueous solution diluted with. The diluted aqueous solution usually contains an adjuvant of 500 to 40,000.
0 ppm, preferably 1,000 to 25,000 ppm
Including. (2) After adding the safener composition of the present invention to a herbicide composition containing one or more compounds selected from the compound (A), the compound (B) and the compound (C), water 100 to 1,00
Diluting with 0 liters. The phytotoxicity reducing agent of the present invention is usually diluted with water and then an adjuvant is usually added at 500 to 40,000 p.
pm, preferably 1,000 to 25,000 ppm. (3) A phytotoxicity-reducing composition of the present invention produced by adding the phytotoxicity-reducing agent and the auxiliary agent of the present invention to one or more compounds selected from the compound (A), the compound (B) and the compound (C). A method of diluting with 100 to 1000 liters of water. After diluting with water, the adjuvant is usually 500 to 40,000 ppm,
It preferably contains 1,000 to 25,000 ppm.

According to the present invention, the main harmful weeds can be controlled in the no-tillage cultivation without damaging the crops, especially the corn. Further, it can be mixed or used in combination with other pesticides and fertilizers, and in this case also, excellent effects can be obtained.

[0022]

[Example 1]

One or more compounds selected from the compound (A), the compound (B) and the compound (C) 10 parts by weight Dikelite PFP 77.4 parts by weight (Carion-based clay: product name of Siquelite Industry Co., Ltd.) Solpol 50503 0.6 parts by weight (anionic surfactant: trade name of Toho Chemical Industry Co., Ltd.) Renolex 1000C 5.4 parts by weight Carplex # 80 (anti-caking agent) 3.6 parts by weight The above components are mixed and ground, Obtain a wettable powder. This is diluted with water containing 1,000 ppm of Solpol W-150B (polyoxyethylene alkylphenyl ether) and sprayed.

Example 2 One or more compounds selected from the compound (A), the compound (B) and the compound (C) 10 parts by weight R-25788 20 parts by weight Dichrite PFP 50.2 parts by weight (carion type) Clay: Siglite Co., Ltd. product name) Solpol 5050 2.8 parts by weight (Anionic surfactant: Toho Chemical Industry Co., Ltd. product name) Renolex 1000C 4.2 parts by weight Carplex # 80 (anti-caking agent) ) 2.8 parts by weight The above components are mixed and pulverized to obtain a wettable powder. This is diluted with water containing 1,000 ppm of Solpol W-150B and sprayed.

[Test Example 1] Diluted soil was filled in a 1,000,000 hectare pot, and corn seeds were sowed to cover about 1.5 cm of soil. Furthermore, after the rice husks were uniformly placed on the soil surface, the wettable powder obtained according to the above Example 1 was diluted with 500 liters / ha of water containing 1,000 ppm of Solpol W-150B and sprayed uniformly with a small spray. did. At the same time, Solpol W-
A similar test was conducted without the addition of 150B. After processing 20
On the day, the growth status of corn was determined based on the foliage and roots (upper part: roots up to 5 cm from the ground surface; lower part: 5 parts from the ground surface).
cm to 10 cm) with the naked eye, and according to the criteria for determining herbicidal effect and phytotoxicity, Tables 1-1 to 1
The results shown in Table 3 were obtained.

As is clear from the results, it was confirmed that the addition of Solupol W-150B, which is one of the adjuvants, has a phytotoxicity-reducing effect on the foliage and roots. [Test Example 2] A distillate soil was filled in a 1,000,000 hectare pot and corn seeds were sown to cover about 1.5 cm of soil. Furthermore, after the rice husks were uniformly placed on the soil surface, the wettable powder obtained according to Example 2 was diluted with 500 liters / ha of water containing 1,000 ppm of Sorpol W-150B and sprayed uniformly with a small spray. did. At the same time, as a control, the same test was conducted without adding Solpol W-150B. On the 20th day after the treatment, the growth condition of corn was examined for foliage and roots (upper part: roots up to 5 cm from the ground surface; lower part: 5 cm to 10 c from the ground surface).
The roots between m) were visually observed, and the results shown in Table 2 were obtained according to the criteria of the herbicidal effect and the phytotoxicity.

As is clear from the results, the addition of Solupol W-150B, which is one of the adjuvants, was found to have a phytotoxicity-reducing effect on the foliage and roots. Further, the effect of R-25788 for reducing the chemical damage was also improved by adding Sorpol W-150B, and the chemical damage to the root part was remarkably reduced. [Test Example 3] A 33 cm long, 33 cm wide, 7 cm high plastic box filled with diluvial soil was provided, and the entrees (A), velvetleaf (B), caddis (C), bluefin (D), morning glory (E), Datura (F),
Seeds of ragweed (G), dogwood (H), white azalea (I) and corn (a) were sown and covered with soil for about 1.5 cm. Furthermore, after the rice husks were uniformly placed on the soil surface, the wettable powder obtained according to Example 1 was diluted with 500 liters / ha of water containing a predetermined amount of Solpol W-150B and uniformly sprayed with a small spray. Sprayed. At the same time, as a control, the same test was conducted without adding Solpol W-150B. On the 20th day after the treatment, the growth condition was visually observed, and according to the criteria for the herbicidal effect and the phytotoxicity, the 3-1.
The results of Tables to Table 3-3 were obtained.

As is clear from the results, the addition of Solupol W-150B, which is one of the adjuvants, suppressed the suppression of corn growth, but had almost no effect on the herbicidal effect.

Criteria for determining herbicidal effect or phytotoxicity 9: Inhibition over 90% or complete death 8: Over 80%, 90% or less inhibition 7: Over 70%, 80% or less inhibition 6: 60% Over, 70% or less suppression 5: Over 45%, 60% or less suppression 4: Over 30%, 45% or less suppression 3: Over 15%, 30% or less suppression 2: Over 5%, Suppression of 15% or less 1: Suppression of more than 0% and 5% or less 0: No effect

[0029]

[Table 1] [Table 1-1] ───────────────────────────── Adjuvant addition amount Compound (A) Kind application rate Stems and leaves Root (ppm) (g / ha) Upper and lower ───────────────────────────── 100 1.0 3.0 2.0 200 1.0 6.0 3.0 0 400 1.5 6.0 5.0 800 2.0 7.0 6.0 Solpol 1600 3.0 8.0 7.0 W-150B ────────────────────── 100 0.0 4.0 0.0 200 0.0 3.0 0.0 1000 400 0.3 5.0 1.0 800 1.0 6.0 4.0 1600 1.3 8.0 4.0 ─────────────────────────────

[0030]

[Table 2] [Table 1-2] ───────────────────────────── Adjuvant addition amount Compound (B) Kind application rate Stems and leaves Root (ppm) (g / ha) Upper and lower ───────────────────────────── 100 0.0 5.0 2.0 0 200 0.5 5.0 2.0 400 4.0 7.0 2.0 Solpol 800 5.0 8.0 6.0 W-150B ────────────────────── 100 0.0 2.0 0.0 1000 200 0.0 3.0 0.0 400 0.8 0.8 6.0 1.0 800 2.5 8.0 4.5 ──────────────────────────────

[0031]

[Table 3] [Table 1-3] ───────────────────────────── Adjuvant addition amount Compound (C) Application rate of types Stem and leaves Root (ppm) (g / ha) Upper and lower ───────────────────────────── 100 1.0 8.0 2.0 0 200 3.5 8.0 4.0 400 4.0 8.0 5.0 Solpol 800 5.0 8.0 6.0 W-150B ────────────────────── 100 0.0 8.0 1.0 1000 200 0.5 8.0 4.0 400 1.5 8.0 5.0 800 4.0 8.0 6.0 ─────────────────────────────

[0032]

[Table 4] [Table 2] ─────────────────────────────────── Adjuvant addition amount Compound (A) R-25788 Application rate of phytotoxicity type Application rate Stem and leaf Root (ppm) (g / ha) (g / ha) Upper and lower ─────────────────── ──────────────── 100 0 3.0 8.0 7.0 200 0 5.0 8.0 7.0 400 0 7.0 8.0 8.5 800 0 8.0 8.0 9.0 0 ───────────── ────────── 100 300 1.0 6.0 3.0 200 600 1.0 6.0 4.0 400 1200 2.0 6.0 5.0 Solpol 800 2400 4.0 8.0 6.0 W-150B ──────────────── ──────────── 100 0 0.5 8.0 5.0 200 0 3.0 8.0 6.0 400 0 4.0 8.0 8.0 800 0 5.0 8.0 9.0 1000 ───────────────── ────── 100 300 0.0 1.0 0.0 200 600 0.5 2.0 0.0 400 1200 2.0 3.0 0.0 800 2400 3.0 6.0 2.0 ────────────────── ────────────────

[0033]

[Table 5] [Table 3-1] ──────────────────────────────────── Adjuvan Addition amount Compound (A) Dosage of different types A B C D E F G a (ppm) (g / ha) ───────────────────────── ────────── 20 6.0 3.0 8.5 8.0 3.3 4.0 7.0 3.0 0 40 7.3 5.0 8.8 9.0 5.3 7.7 8.0 3.0 80 7.3 8.2 8.8 9.0 6.3 8.2 8.5 4.0 Solpol 160 8.7 7.7 8.8 9.0 7.7 8.2 8.5 5.0 W- 150B ───────────────────────────── 20 6.3 6.3 8.0 9.0 3.7 4.0 7.0 0.0 1000 40 8.0 7.0 8.3 8.8 5.7 8.0 7.0 0.0 80 8.3 8.2 8.8 9.0 7.3 8.2 8.5 1.0 160 8.3 8.2 9.0 9.0 8.0 8.2 8.7 4.0 ────────────────────────────────── ──

[0034]

[Table 6] [Table 3-2] ─────────────────────────────────── Adjuvant Addition amount Compound (B) Dosage of different types A B C D E G H I a (ppm) (g / ha) ──────────────────────── ─────────── 20 0.0 8.0 7.0 8.5 0.0 4.0 5.0 7.0 0.0 0 40 4.0 8.0 8.0 8.5 0.0 6.0 8.5 8.0 0.0 80 8.0 8.5 8.5 9.0 5.0 7.0 9.0 8.0 1.0 Solpol 160 8.0 9.0 8.5 9.0 5.0 7.0 9.0 9.0 6.0 W-150B ───────────────────────────── 20 2.0 9.0 7.0 9.0 2.0 6.0 9.0 8.0 0.0 1000 40 4.0 8.5 8.0 8.5 2.0 6.0 9.0 8.0 0.0 80 5.0 8.5 8.0 8.5 5.0 7.0 9.0 9.0 0.0 160 7.0 9.0 8.5 9.0 7.0 8.0 9.0 9.0 1.0 ───────────────────────── ───────────

[0035]

[Table 7] [Table 3-3] ─────────────────────────────────── Adjuvant Addition amount Compound (C) Dosage of different types A B C D E G H I a (ppm) (g / ha) ──────────────────────── ─────────── 20 6.0 6.0 8.5 8.0 2.0 8.0 2.0 8.0 0.0 0 40 7.0 8.5 8.5 9.0 8.0 8.0 7.0 8.5 1.0 80 8.0 8.5 9.0 9.0 8.5 8.5 8.0 9.0 2.0 Solpol 160 8.5 9.0 9.0 9.0 9.0 8.5 8.5 9.0 3.0 W-150B ───────────────────────────── 20 7.0 7.0 8.5 8.0 8.0 8.0 8.0 9.0 0.0 1000 40 7.0 8.0 9.0 9.0 8.0 8.0 8.0 9.0 0.0 80 8.0 8.5 9.0 8.5 8.0 8.5 8.0 9.0 0.0 160 8.0 9.0 9.0 9.0 8.5 8.0 8.0 9.0 2.0 ───────────────────────── ───────────

Claims (9)

[Claims] 1. In no-tillage cultivation, compound (A), compound (B) and compound (C): A phytotoxicity-reducing agent comprising an adjuvant having a concentration of 500 to 40,000 ppm when applied, which is used for one or more compounds selected from 2. A compound (A), a compound (B) and a compound (C) used in no-tillage cultivation: The concentration when applied to one or more compounds selected from
A phytotoxicity-reducing composition containing an adjuvant in an amount of -40,000 ppm. 3. In no-tillage cultivation, compound (A), compound (B) and compound (C): The concentration when applied to one or more compounds selected from
A method for reducing phytotoxicity, which comprises adding an adjuvant in an amount of -40,000 ppm. 4. The concentration of the adjuvant when sprayed is 100
The phytotoxicity-reducing agent according to claim 1, which is 0 to 25,000 ppm. 5. The concentration of the adjuvant when sprayed is 1,00.
The phytotoxicity-reducing composition according to claim 2, which is 0 to 25,000 ppm. 6. The concentration of the adjuvant when sprayed is 1,00.
The method according to claim 3, wherein the phytotoxicity is 0 to 25,000 ppm. 7. The phytotoxicity-reducing agent according to claim 1, wherein the adjuvant comprises one or more selected from surfactants, mineral oils and vegetable oils. 8. The phytotoxicity-reducing composition according to claim 2, wherein the adjuvant comprises one or more selected from surfactants, mineral oils and vegetable oils. 9. The method for reducing phytotoxicity according to claim 3, wherein the adjuvant comprises at least one selected from a surfactant, a mineral oil and a vegetable oil.