WO1994022301A1

WO1994022301A1 - Pesticide spreader

Info

Publication number: WO1994022301A1
Application number: PCT/JP1994/000486
Authority: WO
Inventors: Shiro Sato; Kohhei Sakuma; Akihiro Udagawa
Original assignee: Lion Corporation
Priority date: 1993-03-26
Filing date: 1994-03-25
Publication date: 1994-10-13
Also published as: JP2959949B2; JPH06329503A

Abstract

A novel spreader which is applicable to aqueous solutions containing pesticides such as insecticides, bactericides, plant growth hormones and herbicides, is excellent in safety and spreading effect, and is nonreactive with pesticides. The spreader comprises at least one nonionic ester surfactant selected from fatty acid/polyoxyalkylene alkyl ether esters represented by the following general formulae (I): R1COO(C2H4O)mR2 and (II): R1COO(C2H4O)m(C3H6O)nR2, wherein R1COO represents a C14-C18 fatty acid residue; R2 represents C1-C3 alkyl; m represents a mean molar number of addition of (C2H4O) units and ranges from 1 to 20; n represents a mean molar number of addition of (C3H6O) units and ranges from 1 to 3; and the (C2H4O) and (C3H6O) units are bonded to each other at random or in block.

Description

Specification

Agricultural chemicals

Technical field

The present invention relates to a pesticide spreading agent that is used as a kind of pesticide auxiliary and imparts wettability to pesticides.

Technology background

Pesticides such as insecticides, fungicides, plant growth hormones, herbicides, and the like can only exert their effects when absorbed by animals such as plants or pests. However, because the plant surface secreted wax lipoids, feather-like fibers were densely grown, or the surface often had fine irregularities, the aqueous liquid containing pesticides was used for the plant. When sprayed on the surface, there is a problem that the pesticide adheres to the plant surface and is poorly absorbed into the plant, and the pesticide effect is not sufficiently exerted. On the other hand, the surface of the pest has a hydrophobic layer similar to keratinous material, so that when an aqueous liquid containing a pesticide is sprayed on the pest surface, the pesticide adheres to the pest surface and is absorbed inside the pest. There is a problem that the pesticide effect is not sufficiently exhibited.

In order to promote the adhesion of pesticides to the surface of such plants and pests, and the absorption of pesticides into plants and pests, it is widely practiced to add a spreading agent to an aqueous liquid containing pesticides. I have.

Spreading agents are used to improve the wet spreadability (easiness of spreading and spreading) of pesticides, and consist of a surfactant. The spreading agent lowers the surface tension and improves the permeability of the aqueous solution containing the pesticide by the action of the surfactant, thereby increasing the wet spreadability of the pesticide. Although it shows the effect of improving, it also shows physicochemical effects such as emulsification, separation, and suspension of pesticides in aqueous liquid.

From the viewpoint of practicality, the spreading agent for agrochemicals, besides being excellent in wet spreadability, has low foaming properties, does not cause phytotoxicity, and has excellent safety. It is required to be excellent in biodegradability and have properties such as not polluting the environment. However, a material that satisfies these characteristics simultaneously has not been developed yet.

Conventionally, non-ionic surfactants such as polyoxyethylene sorbitan ester, polyoxyethylene alkyl (or aryl) ether, and polyoxyethylene fatty acid ester have been used as pesticide spreading agents; Anionic surfactants such as sulfosuccinate, ligninsulfonate, and polynaphthylsulfonate; and other polyacrylates are known. However, these conventional spreading agents do not simultaneously possess both spreading and biodegradable properties. For example, polyoxyethylene nourphenyl ether, which contains many of the spreading agents as its main components, has poor biodegradability, and has problems with environmental safety such as fish toxicity and plant phytotoxicity, and foaming power. Therefore, there is a problem in workability when spraying pesticides.

Therefore, the present applicant has previously proposed a spreading agent for agricultural chemicals comprising a lower alkyl ester salt of α-sulfofatty acid as a main component (Japanese Unexamined Patent Application Publication Nos. 2-167207 and 4-191). No. 3802). Although this spreading agent has good biodegradability and does not cause much phytotoxicity to crops, it has chemical reactivity, and depending on the pesticide, it may cause solid matter when mixed with the pesticide. To be deposited, There was a problem that the spreading performance was reduced.

INDUSTRIAL APPLICABILITY The present invention reduces the surface tension of a pesticide-containing aqueous liquid, improves its permeability, and is excellent in safety, biodegradability, and low foaming property. It is an object of the present invention to provide an agricultural chemical spreader that does not cause precipitation of water.

Disclosure of the invention

According to the present invention, an agricultural chemical extension comprising at least one ester-type nonionic surfactant selected from fatty acid polyoxyalkylene alkyl ethers represented by the following general formulas (I) and (II): An adhesive is provided.

R 1 COO (C ₂ H ₄₀ ) m R ₂ (I)

(Wherein, RiCOO represents a fatty acid residue having 14 to 18 carbon atoms, R ₂ represents an alkyl group having 1 to 3 carbon atoms, and m is an average number of added moles of (C ₂ H ₄₀ ), 1 Indicate the number of ~ 20)

Ri C OO (C ₂ H ₄₀ ) m (C ₃ H ₆₀ ) n R ₂ (II)

(Wherein, RiCOO represents a fatty acid residue having 14 to 18 carbon atoms, R ₂ represents an alkyl group having 1 to 3 carbon atoms, and m is an average number of added moles of (C ₂ H ₄₀ ), 1 the number of to 20, n is an average addition mole number of (C ₃ H ₆ 0), the number of 1-3, random and (C ₂ H ₄ 0) and (C ₃ H ₆ 0) Or block-wise)

If the number of carbon atoms in the fatty acid residue RiCOO is less than 14 or more than 18, the effect of lowering the surface tension of the pesticide-containing aqueous liquid and the effect of improving the permeability by the spreading agent will be insufficient, and the spreading Pesticide-containing aqueous solution The liquid becomes very foamy. When RiCOO has 14 to 18 carbon atoms, the spreader has very little phytotoxic effect, but when the carbon number is less than 13, especially 11 or less, the spreadable phytotoxicity of the spreader becomes large.

The fatty acid residue RiCOO is derived from various conventionally known fatty acids. In this case, the fatty acid can be saturated or unsaturated, and can be linear or branched. Further, the fatty acid may have a substituent such as a hydroxyl group. Examples of fatty acids that provide R ^ COO include myristic acid, 5-methyltetradecanoic acid, 2,2-dimethyltradecanoic acid, pentadecanoic acid, palmitic acid, somalic acid (9-hexadecenoic acid), margaric acid, stearin Acids, oleic acid, paccenic acid (11-otatadecenoic acid), linoleic acid, linolenic acid, ricinoleic acid, 9,10-dihydroxyoctadecanoic acid, elaidic acid, isostearic acid, etc. .

The number of carbon atoms of the lower alkyl group R ₂ is one to three, preferably 1-2. When the carbon number of the lower alkyl group R ₂ exceeds 3, the fish toxicity of the spreading agent becomes poor, and when it is 5 or more, the permeability of the spreading agent decreases. Also, when R ₂ is hydrogen, the permeability of the spreading agent is extremely poor, and the performance as the spreading agent is reduced.

The average number of moles of addition (m) of (C ₂ H ₄₀ ) is from 1 to 20, preferably from 2 to 10. If the average number of added moles m is smaller than this value, the permeability of the spreading agent is significantly reduced, while if it is large, the permeability of the spreading agent is reduced and the foaming property is too high. .

The average number of added moles n of (C ₃ H ₆₀ ) is 1 to 3, preferably 2 to _{3.c When the} average number of added moles n exceeds 3, the permeability of the spreading agent decreases and the Degradability also worsens.

In the general formula (II), (C ₂ H ₄₀ ) and (C ₃ H ₆₀ ) may be bonded randomly or in blocks. In the case of block connection, the connection order of the (C ₂ H ₄₀ ) block and the (C ₃ H ₆₀ ) block is arbitrary. As an example of a block-like bond between (C ₂ H ₄₀ ) and (C ₃ H ₆₀ ), (C ₂ H ₄₀ ) m (C ₃ H ₆₀ ) n, (C ₃ H ₆ O) n ( _{C2H4O) m, (C 3 H} 6 0)! _{_{(C 2 H 4 0) m}} (C 3 H e O) (C 3 H 6 0) 2 (C 2 H 4 0) m (C 3 H 6 0) (C 3 H 6 0)! (C ₂ H ₄ 0) mq (C ₃ H ₆ 0)! (C ₂ H ₄₀ ) q (where q <m) and the like.

The fatty acid polyoxyalkylene alkyl ether represented by the general formula (I) is obtained by adding ethylene oxide to a fatty acid and then reacting it with an alkyl halide, or adding ethylene oxide to a lower alcohol. After the reaction, it can be produced by reacting a fatty acid or a lower alkyl ester thereof. The fatty acid polyoxyalkylene alkyl ether represented by the general formula (II) is capable of reacting a fatty acid with a random or block addition reaction of ethylenoxide and propylene oxide and then reacting an alkyl halide. It can be obtained by reacting a lower alcohol with ethylene oxide and propylene oxide in a random or block manner and then reacting a fatty acid or a lower alkyl ester thereof.

The spreading agent of the present invention is usually used by adding to and mixing with an aqueous pesticide-containing solution at the time of spraying the pesticide. Pesticide-containing aqueous liquids are aqueous solutions of pesticides, It can be an aqueous dispersion of a pesticide, an aqueous emulsion of a pesticide, or the like. The pesticides include various conventionally known substances such as insecticides, fungicides, plant growth hormones, and herbicides.

When the pesticide spread agent of the present invention is added to the pesticide-containing aqueous liquid, the fatty acid polyoxyalkylene alkyl ether as the pesticide spreader is added as it is or in the form of a solution. When added in the form of a solution, the concentration of the fatty acid polyoxyalkylene alkyl ether in the solution is 5 to 95% by weight, preferably 10 to 80% by weight. The spreading agent solution can be an aqueous solution, a water-soluble organic solvent solution, an aqueous solution containing a water-soluble organic solvent, or the like. The amount of the spreading agent added to the pesticide-containing aqueous liquid varies depending on the type of pesticide, but generally, the concentration of the fatty acid polyoxyalkylene alkyl ether contained in the pesticide-containing aqueous liquid is from 30 to 500,000. It is in the range of ppm, and is appropriately selected according to the plant or pest to be sprayed.

The pesticide spreader of the present invention, when added to the pesticide-containing aqueous liquid, significantly lowers its surface tension and enhances its permeability. Therefore, when the pesticide-containing aqueous liquid to which the spreading agent of the present invention is added is sprayed on plants and pests, adhesion of the pesticides on the surfaces of the plants and pests and penetration or absorption of the pesticides into the plants and pests are suppressed. Promoted and high pesticide effect. Moreover, since the pesticide spreader of the present invention has a low foaming property, when added to and mixed with the pesticide-containing aqueous liquid, the generation of foam is extremely small, and the dispersibility of the pesticide-containing aqueous liquid is deteriorated. Not even.

The pesticide spreader of the present invention has extremely high safety and excellent biodegradability, and thus does not cause environmental pollution. In addition, the present invention Since the chemical spreader has virtually no chemical reactivity, when added to an aqueous solution containing pesticides, it reacts with the pesticides to inactivate the pesticides, depositing solids Does not occur.

Hereinafter, the present invention will be described more specifically with reference to examples. The evaluation method of the spreading agent used in the examples is as follows.

(1) Surface tension evaluation method

Using CBVP-A3 type manufactured by Kyowa Kagaku Co., Ltd. as a surface tension measuring device, the surface tension is measured with a test solution prepared by diluting the spreader sample to a concentration of 30 ppm with 3 degree hard water at 25 ° C. did.

(2) Penetration evaluation method

In a 20 Om1 beaker, add the test solution obtained by diluting the spreading agent sample to 30 ppm with 3 degree hard water, and place a felt disk of l X lcm (2 mm thick) from a height of about 5 cm above the water surface. Drop and measure the settling velocity of the felt disc. The sedimentation speed at this time is defined as the time (sec) from the time when the disk lands on the surface to the time when the disk starts to sink.

(3) Foaming power (inverted method)

Into a 250 ml graduated cylinder with a stopper, place 25 Om 1 of the test solution diluted with 30 ppm of the spreading agent sample, shake it upside down 15 times within 30 seconds, and immediately shake the foam. The height A (mm) of the sample and the height B (mm) of the foam after 5 minutes were measured and indicated as A → B.

(4) Biodegradability

Activated sludge of 3 O ppm as solids is added as a seeding source to a test aqueous solution with a spreading agent sample concentration of 100 ppm, and the BOD (biochemical oxygen consumption) is added. , TOD (Total Oxygen Consumption) is measured over time, and the degree of biodegradation = BODZTOD (%) is evaluated according to the following criteria.

◎: Time until biodegradation reaches 60% is less than 14 days

〇: Time to reach 60% biodegradation 14 to 28 days

X: Time to reach biodegradability of 60% is 29 days or more, or does not reach 60% even if biodegradation is 29 days or more

(5) Fish toxicity

Based on JIS K 0102 Factory Wastewater Test Method 71 (acute toxicity test with fish), the fish toxicity TLm value (48 hours) of the Japanese medaka was measured, that is, the half lethal concentration (ppm) after 48 hours.

(6) Plant phytotoxicity

An aqueous solution of the spreading agent was sprayed on cabbage and snack endu in an amount equivalent to 5 O O O ppm in terms of an active ingredient, and the phytotoxicity (%) after 5 days was examined.

(7) Reactivity with pesticides ''

The presence or absence of precipitates was visually observed when 250 ppm of the spreading agent sample was added to an aqueous solution of agrochemicals containing 0.5% of agrochemicals such as basic copper chloride, cupric hydroxide, and basic copper sulfate. Judged.

〇: No precipitate is generated

△: Some precipitates are observed

X: Large amount of precipitates generated

Example 1

The performance of the spreading agents shown in Table 1 was evaluated, and the results are shown in Table 2. 1: Type of spreading agent

R _n C OO (C2H4O) m (C 3 H6 O) n R _?

Spreading agent

RxCOO mn R ₂

Real 2 C17H33COO 1, 50 CH ₃

App 4 C17H33COO 5 3 CH ₃

Example 6 C17H33C OO 1 0 0 C 2H 5

7 C ₁₇ H ₃₅ COO 5 3 CH ₃

Ratio 1 C11H23COO 50 CH ₃

Comparison 3 C17H33COO 250 CH ₃

Example 5 C17H33C OO 1 0 0 then 4n 9

Sales agent A * ¹

8 巿 Sales agent B * ²

9 NFE * ³

0 AE * ⁴

Example a-SF * ⁵ * 1) Polyoxyethylene alkyl phenyl ether surfactant

* 2) Polyoxyethylene alkyl phenyl ether surfactant (low foaming spreading agent)

* 3) Polyoxyethylene (p = 9) Noninolephenyl ether

* 4) Polyoxyethylene (p = 9) alkyl (C = 12) ether

* 5) A mixture of α-sulfofatty acid methyl ester diethanolamine salt having 14 carbon atoms in the fatty acid residue and C ₁₂ alkyldimethylamine oxide.

2: Test results Fish toxicity Plant phytotoxicity (%) Surface tension Foaming power Penetration Biodegradability ΤΙπ (ρριη) Cabbage gentian Precipitation dyn / cm

1 〇> 100 15 20 〇 30.3 10 → 6 1524 Actual 2 〇> 100 0 25 〇 33.0 5 → 5 2432

3 〇> 100 0 20 〇 33.5 6- → 5 1456 Application 4 O> 100 0 17 O 34.0 9 → 4 1345

5 O> 100 8 50 〇 34.0 6 → 6 791 Example 6 〇> 100 20 13 〇 32.5 6-> 5 1092

7 O> 100 10 13 o 33.2 11 → 7 1209

8 O> 100 13 15 o 34.5 15 → 10 1652

1 O 70-100 100 100 o 36.0 3 → 3 940

2 O> 100 25 0 〇 35.7 4 → 3> 3600 ratio 3 o 70-100 5 52 〇 35.0 30 25> 3600 comparison 4 o 70-100 〇 35.6 1 → 0> 3600 Example 5 〇 12 100 0 o 32,7 5- → 3 1023

D li, 1U 100 58 li.i J— * L 3600

7 X approx. 10 100 100 〇 31.0 30-> 28 631 ratio 8 X approx. 10 83 100 o 31.9 7 → 5 1104 comparison 9 X approx. 10 100 100 o 32.4 24 → 23 621 Example 10 © approx. 10 o

11 ◎ 16 17 33 X 32.7 55--54 707 Test example 1

In order to examine the spreading effect of the spreading agent of the present invention, a solution obtained by adding the spreading agent of the present invention to an aqueous solution of a contact-type herbicide (trade name: Preglox, manufactured by Nippon Agrochemical Co., Ltd.) was used. Herbicidal tests were conducted on three representative weeds. For comparison, a herbicidal test using a drug solution to which the spreading agent of the present invention was not added was performed. The specific contents of this test method are shown below, and the test results are shown in Table 4.

1. Test method

1) Testing location: Glass greenhouse (25 ° C / 15 ° C: day / night)

2) Spreading agent: a solution obtained by dissolving 40 parts by weight of the compound of Example 4 in a mixture of 40 parts by weight of butyl ester-based solvent and 2 parts by weight of water)

3) Test weeds: Meishiba, Inubie, Shiroza

Note) Grass type was prepared, and the pottery was prepared three days before treatment using scissors.

4) spraying method (foliar application): Scatter water 1 00 l Zm ² 2 atm pressure, TEE J ET nozzle used, foliar 30 cm by Li spray

Three

2. Composition of test area

Table 3: Outline of test plot

3. Test results

Table 4: Adherence of chemicals and herbicidal effect

(1) Adherence of the chemical solution: The condition of the leaf surface immediately after the treatment was observed and evaluated according to the following four grades.

0: The chemical rolls down from the leaf surface and hardly adheres to the leaf surface Four

1: Rolling and dropping are observed immediately after treatment, but partial adherence of chemical solution is observed.

2: There is no falling down immediately after treatment, and fine-grained chemical solution is observed on the entire leaf surface

3: The chemical spreads in a plane over the entire leaf surface, and a drop of the chemical is observed from the leaves and tips.

(2) Herbicidal effect: Observed on the 5th and 14th days after the treatment, the amount of residual herbage (the amount of fresh grass) was compared with that of the untreated plot and evaluated on the following five scales. The values in the untreated column indicate the plant height at the time of preparation.

5: Residual grass amount 0% (complete withering),

4: Residual grass amount 0-10%,

3: 20% residual grass.

2: Residual grass amount 4 1 to 60%,

Residual grass 6 1% or more

(3) Observation results of the state of adhesion of the chemical solution

The crabgrass, moss, and shiroza used in this test are all resistant to chemicals.

Immediately after the treatment, the chemical solution turned down in the non-spreader-added zone (test zones Nos. 2 and 4), but the chemical solution was partially adhered.

In the areas to which the spreading agent of the present invention was added (test areas No. 3 and 5), almost no drop of the chemical solution was found immediately after the treatment, and fine chemical solution was found to adhere to the entire leaf surface. Stable on leaves (4) Weeding results

In this test, in order to clarify the improvement of the herbicidal effect of the spreading agent, in addition to the standard herbicide usage (8 Oml), the dose (20 ml) below the standard usage range was used. Za) was added to the study.

On the 5th day after the treatment, in the Preglox L 80m1 section, all the plants were completely dead except for the withering delay of the crabgrass in the non-spreader-added section. On the other hand, in the low herbicide dose (20 ml Za) plot, the addition of a spreading agent tended to reduce the amount of residual herbicide (improve the herbicidal effect) for all weeds.

In the survey on the 14th day after the treatment, all the weeds were almost completely killed in all the plots, including the plot with no spreading agent, in the plots with the standard amount of herbicide used. On the other hand, in the herbicide low-dose area, there was a tendency to reduce the amount of residual herbage (improve the herbicidal effect) by adding a spreading agent.

From the above, the addition rate of the spreading agent of the present invention to the contact herbicide (Preglox L) clearly improved the adhesion rate of the drug solution to the leaves. In addition, even in a low-dose area (20 ml Za) in which the herbicide was set to a small amount, the medicinal solution to which the spreading agent of the present invention was added showed a stable herbicidal effect.

Test example 2

The results of evaluating the phytotoxic properties of the spreading agent of the present invention on crops are shown below.

The following spreading agents are added to a selective herbicide (trade name: One Side Emulsion, manufactured by Ishihara Sangyo Co., Ltd.) to make a chemical solution, and this chemical solution is applied to three typical crops. The phytotoxicity of the spreading agent was evaluated.

1. Test method 1) Test location: Greenhouse (25 ° C / 15 ° C: daytime and nighttime)

2) Spreading agent

(1) The spreading agent of the present invention: the compound of Example 4

②Comparative spreading agent: Kusalino 10 (Non-Agrochemical Co., Ltd., nonionic surfactant)

(3) Comparative spreading agent: Surfactant WK (Kao Corporation, nonionic surfactant)

3) Test crops: Cabbage (Name: Shogun Kanai, Properties: Flat leaves, but with a lot of wax), Tomato (Name: Momotaro, Properties: Little of wax, but many mochi), Eggplant (Name: 1,000) No. 2, Properties: The amount of wax is not so large and there are few protrusions on the leaf surface)

Note: Each crop was grown in a separate pot, and the day before treatment was adjusted using scissors to make the top five leaves.

4) Spray method: foliage spraying, spray liquid volume 100 ml / m 2 atm pressure, TEE JET nozzle, 30 cm spray on leaf.

7

2. Composition of test plot Table 5: Outline of test plot

Test plot No. Drug name Component concentration (P P m) Herbicide dose

1 No processing ―

2 —-

3 1 0 0 0

4 The spreading agent of the present invention 5 0 0 0

5 1 0 0 0 0

6 200 Inside emulsion

7 Kusalino 1 10 5 0 0 0 10ml / a (standard amount)

8 1 0 0 0 0

9 2 0 0 0

1 0 Surfactant WK 5 0 0 0

1 1 1 0 0 0 0

Situation of chemical liquid adhesion Symptoms of phytotoxicity Degree of phytotoxicity Test zone No. Cabbage tomato eggplant cabbage tomato eggplant cabbage tomato eggplant

1 ― ― Ichi (10 leaf stage) (10 leaf stage) (8 leaf stage) ― ― ―

2 0 1 1 None None None ",, ',,,

3 2 3 2 None None None

4 3 3 3 New leaves slightly faded None None Micro 4 /, H, E,

5 3 3 3 Slight fading of new leaves Slightly withered leaves Atrophy of new leaves

6 2 3 2 None None None ',, / ,,, None

7 3 3 3 Brown spot on leaf edge Brown spot on leaf blade Atrophy of new leaf

8 3 3 3 Brown spot on leaf edge Brown spot on leaf blade Atrophy of new leaf

9 3 3 3 New leaves Slightly fading Slightly withered leaves Atrophy of new leaves

1 0 3 3 3 Brown spot on leaf edge Brown spot on leaf blade Brown spot on leaf blade

1 1 3 3 3 Brown spot on leaf blade Browning of leaf blade Brown spot

^ 6 (1) Adherence of the chemical solution: The condition of the leaf surface immediately after the treatment was observed and evaluated according to the following four grades.

0: The chemical rolls down from the leaf surface and hardly adheres to the leaf surface.

1: Immediately after treatment, rolling from the leaf surface of the chemical solution is seen, but the chemical solution is partially adhered to the leaf surface.

2: Immediately after treatment, the chemical solution does not fall off the leaf surface, and fine-grained chemical solution adheres to the entire leaf surface

(2) Symptoms of phytotoxicity and degree of phytotoxicity: Observation of symptoms of phytotoxicity on the 6th day after treatment, judgment of growth recovery on the 14th day after treatment, and degree of phytotoxicity based on the results. Was evaluated on the following six scales.

No: no phytotoxicity

Minimal: Some symptoms are observed, but there is no problem in production. Micro: Growth is temporarily stagnant due to chemical damage, but recovery is fast and there is no practical problem.

Small: Growth is stagnant due to chemical damage, recovery is slow and there is a practical problem. Medium: Growth is temporarily stagnant due to chemical damage, and recovery is slow.

Large: phytotoxic growth stopped or died, no recovery was observed

(3) Observation results of the state of adhesion of the chemical solution

In the No. 2 no-spreader-added area (herbicide-only area), no chemical solution was observed on the cabbage surface, and the chemical solution did not adhere well to tomatoes and eggplants. It was not a minute. On the other hand, in the spreading agent-added sections of No. 3 to No. 5 according to the present invention, a clear effect of improving the chemical liquid adhesion rate was obtained. By the way, at the spreading agent concentration of 1 000 PPm of the present invention, the same chemical solution adhesion status as the standard use concentration of xsalino 10 (200 ppm) used as a comparison was obtained. Further, at the spreading agent concentration of 50,000 ppm of the present invention, the same adhesion state as the standard use concentration (2000 ppm) of the comparative surfactant WK was obtained.

(4) Observation results of symptoms of phytotoxicity and degree of phytotoxicity

At a concentration of 100 ppm, the spreading agent of the present invention did not show any problematic toxic symptoms even though it showed a sufficient effect of applying a chemical solution.

Incidentally, at the concentration of 100 000 ppm of the spreading agent of the present invention, mild phytotoxicity (leaf tip dying or atrophy of new leaves) was observed, which was the standard concentration of Surfactant WK used for comparison. At 2000 pm).

From the above results, it was confirmed that the spreading effect of the spreading agent of the present invention was confirmed, and that the safety against crops was relatively high (no leaf damage at 1 000 ppm, minimal level at 100 000 ppm). It can be said that it was shown.

Claims

The scope of the claims

(1) An agricultural chemical spraying agent comprising at least one ester-type nonionic surfactant selected from fatty acid polyoxyalkylene alkyl ethers represented by the following general formulas (I) and (II).

RiCOO (C ₂ H ₄₀ ) m R ₂ (I)

(Wherein, RiCOO represents a fatty acid residue having 14 to 18 carbon atoms, R ₂ represents an alkyl group having 1 to 3 carbon atoms, and m is an average number of added moles of (C ₂ H ₄₀ ), 1 Indicates the number of ~ 20)

RiCOO (C ₂ H ₄₀ ) m (C ₃ H ₆ 〇) n R ₂ (II)

(Wherein, RiCOO represents a fatty acid residue having 14 to 18 carbon atoms, R ₂ represents an alkyl group having 1 to 3 carbon atoms, and m is an average number of added moles of (C ₂ H ₄₀ ), 1 the number of to 20, n is an average addition mole number of (C ₃ H ₆ 0), the number of 1-3, random and (C ₂ H ₄ 0) and (C ₃ H _e O) Or block-wise)