JP2002047104A - Agent for preventing flower abscission and fluid drop for plant and method for preventing drop of flower and fruit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an agent for preventing flower abscission and fruit drops which has an ability to prevent flower abscission and fruit drops for a wide range of plants, and to provide a method for preventing the flower abscission and fruit drops. SOLUTION: This agent for preventing flower abscission and fruit drops for plants, characterized by containing a jasmonic acid-based compound represented by the general formula (1) (R1 is a hydrocarbon group; R2 is H or a hydrocarbon group) as an active ingredient, and the method for preventing flower abscission and fruit drops, characterized by applying the agent for preventing flower abscission and fruit drops to a plant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel peanut inhibitor for plants and a method for preventing peanuts applied to fruit trees and fruits and vegetables.

[0002]

2. Description of the Related Art In agricultural production, the rate at which blossomed flowers of cultivated plants become fruit and become harvested (fruit yield) is an important factor that determines the increase or decrease in yield. Generally, cultivated plants are affected by wind and rain, pests, physiological effects of the plants themselves, etc.
Often before the harvest season flowers and immature fruits fall and the yield is reduced. Several peanut inhibitors for preventing such peanuts and fruits (hereinafter referred to as "peanuts") are commercially available, and are practically used to increase crop yields.

For example, the fall of Kyoho, a large-grained grape variety, is also referred to as “flower blossom”, and is a major problem in harvesting for cultivation farmers. As an agent to be used, a peanut inhibitor containing an active ingredient such as 2-chloroethylphosphonic acid (generic name: ethephon) or 1,1-dimethylpiperidinium chloride (generic name: mepiquat chloride) is known. .

[0004] However, the peanut-preventing effects of these chemicals are not sufficiently satisfactory, and these chemicals are applicable only to fruit trees such as grapes in which the new sheath grows before flowering. It is hard to say that the spectrum of action on various crops is sufficiently wide.

[0005] On the other hand, in fruit trees such as cherry and peach, which bloom on the branches grown in the previous year and the new pods extend after flowering, the amount of crops decreased due to the fall of flowers and fruit before the harvest may cause a problem. is there. However, an effective agent for preventing such peanuts in plants has not yet been developed, and there is a need for an effective agent for preventing peanuts.

Incidentally, n-propyl (2-pentyl-
Jasmonic acid compounds represented by 3-oxo-cyclopentyl) acetate (generic name: prohydrojasmon) promote plant growth, germination, low-temperature damage prevention, delamination formation promotion, harvested fruit ripening prevention, flowering It has been reported to have various and various actions such as maintaining freshness, and application to the agricultural field has been proposed (WO 94/18833,
JP-A-8-113503, JP-A-11-139908
JP-A-11-255601, JP-A-11-299
352, JP-A-2000-16902, etc.). However, these patent documents do not describe the peanut-preventing action of plants as described above.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the state of the prior art, and its object is to provide:
An object of the present invention is to provide a novel peanut inhibitor and a method for preventing peanuts having a high ability to prevent peanuts for a wide range of plants.

[0008]

Means for Solving the Problems In order to achieve the above object, the present inventors focused on a jasmonic acid-based compound, applied the compound to many cultivated plants, and caused the compound by the physiological mechanism of the plant itself. We studied diligently the effect of preventing falling flowers and immature fruits from falling. As a result, it was found that flowering and fruit dropping of many plants such as grape, cherry, peach, soybean, bean, cucumber, and eggplant can be extremely effectively prevented, and that the yield can be significantly increased, and the present invention has been completed. I came to.

Thus, according to the first aspect of the present invention, there is provided a peanut inhibitor for plants, which comprises a jasmonic acid-based compound represented by the general formula (1) as an active ingredient. Further, according to a second aspect of the present invention, there is provided a method for preventing peanut fruit, which comprises applying the peanut inhibitor to a plant.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The peanut inhibitor and the method for preventing peanuts according to the present invention will be described in detail below. Peanut inhibitor The plant peanut inhibitor of the present invention contains a jasmonic acid compound represented by the following general formula (1) as an active ingredient.

[0011]

Embedded image

In the general formula (1), R ¹ is not particularly limited as long as it is a hydrocarbon group.
20, preferably an alkyl group having 1 to 6 carbon atoms and an alkenyl group having 2 to 20 carbon atoms, preferably 2 to 6 carbon atoms.

Specific examples of R ¹ include methyl, ethyl, n-propyl, isopropyl, n-butyl,
sec-butyl, t-butyl, n-pentyl, isopentyl, 2-methylbutyl, 1-methylbutyl, n-hexyl, isohexyl, 3-methylpentyl, 2-methylpentyl, 1- Methylpentyl, n-heptyl, isoheptyl, n-octyl, isooctyl, 2-ethylhexyl, nonyl, decyl, allyl, 2-butenyl, 3-butenyl, isobutenyl, 4-pentenyl Group, 3-pentenyl group, trans-2-pentenyl group, cis-2-pentenyl group, 1-pentenyl group, 3-methyl-2-pentenyl group, 5-hexenyl group, 3-hexenyl group, 2-hexenyl group, Examples include a heptenyl group, an octenyl group, a nonenyl group, and a decenyl group.

Among these, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, t-butyl, n-pentyl, isopentyl,
2-methylbutyl group, 1-methylbutyl group, n-hexyl group, isohexyl group, 3-methylpentyl group, 2-methylpentyl group, 1-methylpentyl group, allyl group,
-Butenyl group, 3-butenyl group, isobutenyl group, 4-
Pentenyl group, 3-pentenyl group, trans-2-pentenyl group, cis-2-pentenyl group, 1-pentenyl group, 3-methyl-2-pentenyl group, 5-hexenyl group, 3-hexenyl group, 2-hexenyl group And the like, and n-pentyl, isopentyl, 2-methylbutyl, 1-methylbutyl, 4-pentenyl, 3-pentenyl, trans-2-pentenyl, cis-2-
An alkyl group having 4 to 5 carbon atoms such as a pentenyl group and a 1-pentenyl group or an alkenyl group having 4 to 5 carbon atoms is more preferable.

R ² represents a hydrogen atom or a hydrocarbon group.
As the hydrocarbon group, for example, an alkyl group having 1 to 20, preferably 2 to 8, and more preferably 3 to 6 carbon atoms;
2-20 carbon atoms, preferably 2-8, more preferably 3
An alkenyl group having from 6 to 6 carbon atoms;
8, more preferably 3 to 6 alkynyl groups; and 1 to 20 carbon atoms, preferably 2 to 3 hydroxyalkyl groups.

Specific examples of R ² include a hydrogen atom; a methyl group, an ethyl group, an n-propyl group, an isopropyl group,
n-butyl group, n-pentyl group, n-hexyl group, 2-
A straight-chain or branched alkyl group having 1 to 20 carbon atoms such as a methylbutyl group; having 2 to 2 carbon atoms such as an allyl group, 3-butenyl group, 2-pentenyl group, 4-methyl-3-pentenyl group and 2-hexenyl group; An alkenyl group having 20 carbon atoms; an alkynyl group having 2 to 20 carbon atoms such as a propargyl group, a 3-butynyl group, a 2-pentynyl group, and a 3-hexynyl group; a hydroxymethyl group, a 2-hydroxyethyl group, a 2-hydroxypropyl group, and 3 A hydroxyalkyl group such as a hydroxypropyl group;

The compounds of the present invention may have optical isomers derived from asymmetric carbon atoms. When R ¹ and / or R ² is an alkenyl group, cis-trans stereoisomers may exist. These are all included in the scope of the present invention.

In the above formula (1), R ² is a hydrocarbon group, that is, specific examples of the jasmonate compound include methyl (2-n-pentyl-3-oxo-cyclopentyl) acetate and methyl [2- (3 -N-pentenyl) -3-oxo-cyclopentyl] acetate, ethyl (2-n-pentyl-3-oxo-cyclopentyl) acetate, ethyl [2- (2-n-pentenyl)
-3-oxo-cyclopentyl] acetate, n-propyl (2-n-pentyl-3-oxo-cyclopentyl) acetate, n-propyl [2- (2-n-pentenyl) -3-oxo-cyclopentyl] acetate, n
-Propyl [2- (3-n-pentenyl) -3-oxo-cyclopentyl] acetate, n-propyl [2-
(2-methyl-n-butyl) -3-oxo-cyclopentyl] acetate, n-propyl [2- (2,2-dimethylpropyl) -3-oxo-cyclopentyl] acetate, isopropyl (2-n-pentyl-3) -Oxo-
Cyclopentyl) acetate,

Isopropyl [2- (2-n-pentenyl) -3-oxo-cyclopentyl] acetate, isopropyl [2- (3-n-pentenyl) -3-oxo-
Cyclopentyl] acetate, n-butyl (2-n-pentyl-3-oxo-cyclopentyl) acetate, n
-Butyl [2- (2-n-pentenyl) -3-oxo-
Cyclopentyl] acetate, n-butyl [2- (3-
n-pentenyl) -3-oxo-cyclopentyl] acetate, isobutyl (2-n-pentyl-3-oxo-
Cyclopentyl) acetate, isobutyl [2- (2-
n-pentenyl) -3-oxo-cyclopentyl] acetate, sec-butyl (2-n-pentyl-3-oxo-cyclopentyl) acetate, sec-butyl [2
-(2-n-pentenyl) -3-oxo-cyclopentyl] acetate, t-butyl (2-n-pentyl-3-
Oxo-cyclopentyl) acetate, 2-methylbutyl (2-n-pentyl-3-oxo-cyclopentyl)
acetate,

N-pentyl (2-n-pentyl-3-oxo-cyclopentyl) acetate, n-pentyl [2
-(2-n-pentenyl) -3-oxo-cyclopentyl] acetate, n-hexyl (2-n-pentyl-3
-Oxo-cyclopentyl) acetate, n-hexyl [2- (2-n-pentenyl) -3-oxo-cyclopentyl] acetate, n-heptyl [2- (2-n-pentenyl) -3-oxo-cyclopentyl] acetate , N-octyl (2-n-pentyl-3-oxo-cyclopentyl) acetate, n-octyl [2- (2-
n-pentenyl) -3-oxo-cyclopentyl] acetate, n-decyl (2-n-pentyl-3-oxo-
Cyclopentyl) acetate, allyl (2-n-pentyl-3-oxo-cyclopentyl) acetate, 2-butenyl (2-n-pentyl-3-oxo-cyclopentyl) acetate, cis-2-pentenyl (2-n-pentyl-) 3-oxo-cyclopentyl) acetate, trans-2-hexenyl (2-n-pentyl-3-oxo-cyclopentyl) acetate,

4-methyl-3-pentenyl (2-n-pentyl-3-oxo-cyclopentyl) acetate, cis-3-hexenyl (2-n-pentyl-3-oxo-
Cyclopentyl) acetate, propargyl (2-n-pentyl-3-oxo-cyclopentyl) acetate, 2
-Pentynyl (2-n-pentyl-3-oxo-cyclopentyl) acetate, 3-butynyl (2-n-pentyl-3-oxo-cyclopentyl) acetate, 3-hexynyl (2-n-pentyl-3-oxo-cyclopentyl) ) Acetate, 2-hydroxyethyl (2-n-pentyl-3-oxo-cyclopentyl) acetate,

2-hydroxypropyl (2-n-pentyl-3-oxo-cyclopentyl) acetate, allyl [2- (2-n-pentenyl) -3-oxo-cyclopentyl] acetate, propargyl [2- (2-n -Pentenyl) -3-oxo-cyclopentyl] acetate;
3-butenyl [2- (2-n-pentenyl) -3-oxo-cyclopentyl] acetate, 3-butynyl [2-
(2-n-pentenyl) -3-oxo-cyclopentyl] acetate, cis-3-hexenyl [2- (2-n
-Pentenyl) -3-oxo-cyclopentyl] acetate. These jasmonate components can be used alone or in combination of two or more.

In the above formula (1), R ² is a hydrogen atom,
That is, specific examples of the jasmonic acid compound include (2-
Ethyl-3-oxo-cyclopentyl) acetate,
(2-n-propyl-3-oxo-cyclopentyl) acetate, (2-isopropyl-3-oxo-cyclopentyl) acetate, (2-n-butyl-3-oxo-acetate)
Cyclopentyl) acetate, (2-sec-butyl-
3-oxo-cyclopentyl) acetate, (2-t-
Butyl-3-oxo-cyclopentyl) acetate,
(2-n-pentyl-3-oxo-cyclopentyl) acetate, (2-isopentyl-3-oxo-cyclopentyl) acetate, [2- (2-methyl-n-butyl) -3-oxo-cyclopentyl] acetate,

[2- (1-methyl-n-butyl) -3-
Oxo-cyclopentyl] acetate, (2-n-hexyl-3-oxo-cyclopentyl) acetate, (2
-Isohexyl-3-oxo-cyclopentyl) acetate, [2- (3-methyl-n-pentyl) -3-oxo-cyclopentyl] acetate, [2- (2-methyl-n-pentyl) -3-oxo-cyclopentyl Acetate, [2- (1-methyl-n-pentyl) -3-oxo-cyclopentyl] acetate, (2-allyl-3
-Oxo-cyclopentyl) acetate, [2- (3-
[n-butenyl) -3-oxo-cyclopentyl] acetate, (2-isobutenyl-3-oxo-cyclopentyl) acetate, [2- (4-n-pentenyl) -3-
Oxo-cyclopentyl) acetate,

[2- (3-n-pentenyl) -3-oxo-cyclopentyl] acetate, [2- (trans-
2-n-pentenyl) -3-oxo-cyclopentyl]
Acetate, [2- (cis-2-n-pentenyl) -3
-Oxo-cyclopentyl] acetate, [2- (1-
n-pentenyl) -3-oxo-cyclopentyl] acetate, [2- (3-methyl-2-n-pentenyl)-
3-oxo-cyclopentyl] acetate, [2- (5
-N-hexenyl) -3-oxo-cyclopentyl] acetate, [2- (3-n-hexenyl) -3-oxo-cyclopentyl] acetate, [2- (2-n-hexenyl) -3-oxo-cyclopentyl] Acetate and the like. These jasmonic acid components can be used alone or in combination of two or more.

The jasmonic acid compounds represented by the above formula (1) are all known compounds and can be produced according to a conventional method. For example, in the above formula (1), R ¹
Is an n-pentyl group, and R ² is an alkyl group. Jasmonate is 2-n-pentylcyclopentene-1
It can be easily obtained by subjecting -one and an alkyl ester of malonic acid to Michael addition, followed by decarboxylation. The alkyl ester thus produced can be transesterified with alcohols according to a conventional method to produce another kind of ester. The jasmonic acid compound can be easily obtained by, for example, hydrolyzing a jasmonic acid ester with a base or an acid.

The peanut inhibitor of the present invention contains one or more jasmonic acid compounds represented by the above formula (1). Further, other agents such as a conventionally known peanut inhibitor, fruiting accelerator, phytohormone, bactericide, insecticide and the like can be further contained.

Examples of such other drugs include benzyladenine, gibberellins, auxins, indoleacetic acid, abscisic acid, brassinosteroids,
Chloroethylphosphonic acid and the like. Moreover,
Various nutrients, for example, sugars such as glucose and sucrose, combined use with fertilizers such as phosphates and nitrates, pH regulators and the like can be added as necessary.

The peanut inhibitor of the present invention comprises one or more jasmonic acid compounds represented by the formula (1),
Liquid carriers, emulsions, wettable powders, tablets, powders, flowables, by appropriately combining solid carriers and liquid carriers, dispersants and the like.
Formulations such as aerosols can be made. Of these, preferred preparations are aqueous preparations, emulsions, organic solutions, wettable powders and other liquid preparations.

Specific examples of the solid carrier include clay group represented by kaolinite group, montmorillonite group, attapulgite group, ziglite, talc, mica, phyllite, pumice, vermiculite, gypsum, calcium carbonate, dolomite. , Diatomaceous earth, magnesium, lime,
Inorganic substances such as phosphorus lime, zeolite, silicic anhydride, synthetic calcium silicate; plant organic substances such as soybean flour, tobacco flour, walnut flour, flour, wood flour, starch, crystalline cellulose, ester gum, copal gum, and dammal gum; Synthetic polymer compounds such as coumarone resin, petroleum resin, alkyd resin, polyvinyl chloride, and ketone resin; waxes such as carnauba wax and beeswax; and ureas. These solid carriers can be used alone or in combination.
It can be used in combination of more than one kind.

Specific examples of the liquid carrier include paraffinic, naphthenic or aromatic hydrocarbons such as kerosene, mineral oil, spindle oil, white oil, benzene, toluene, xylene, ethylbenzene, cumene and methylnaphthalene; tetrachloride Chlorine hydrocarbons such as carbon, chloroform, trichloroethylene, monochlorobenzene and o-chlorotoluene; ethers such as dimethyl ether, diethyl ether, dioxane and tetrahydrofuran; acetone, methyl ethyl ketone, diethyl ketone;
Ketones such as diisobutyl ketone, cyclopentanone, cyclohexanone, acetophenone and isophorone; esters such as ethyl acetate, amyl acetate, ethylene glycol acetate, diethylene glycol acetate, dibutyl maleate and diethyl succinate;

Alcohols such as methanol, ethanol, n-propanol, isopropanol, n-hexanol, ethylene glycol, diethylene glycol and glycerin; ethers such as ethylene glycol phenyl ether and diethylene glycol butyl ether;
Examples include dimethylformamide, dimethylsulfoxide and water. Among them, hydrocarbons, ketones, alcohols, water and the like are particularly preferable, and alcohols and water are particularly preferable. These liquid carriers can be used alone or in combination of two or more.

As the dispersant, those used in the field of ordinary agricultural chemicals can be used, and a surfactant is generally used. The surfactant may be any of nonionic, cationic, anionic and zwitterionic, but a nonionic surfactant is preferably used.
These dispersants can be used alone or in combination of two or more.

Examples of the nonionic surfactant include block condensation polymers of two or more alkylene oxides, polyoxyalkylene ether compounds, polyoxyalkylene glycol fatty acid ester compounds, polyhydric alcohol fatty acid ester compounds, Examples include polyoxyalkylene polyhydric alcohol fatty acid ester compounds, polyoxyalkylene alkylamine compounds, and alkyl alkanolamide compounds.

The method for preparing the peanut inhibitor of the present invention is not particularly limited, and a conventionally known preparation method can be used. For example, in the case of a liquid preparation, a jasmonic acid-based compound represented by the above formula (1), a liquid carrier, a dispersant and other components as desired can be mixed to prepare a stock solution of a peanut inhibitor. The concentration of the jasmonic acid compound in the whole stock solution is usually 0.1 to 99% by weight, preferably 0.2 to 99% by weight.
It is 80% by weight, more preferably 0.5 to 50% by weight, particularly preferably 1 to 30% by weight. The undiluted solution of the peanut inhibitor may be applied to the target plant as it is, but generally, the undiluted solution is diluted with water before being applied.

A method for preventing peanut fruit The method for preventing peanut fruit according to the present invention is characterized in that a peanut inhibitor containing a jasmonic acid compound represented by the above formula (1) as an active ingredient is applied to plants. I do. By this method, peanuts of plants can be effectively prevented, and when applied to cultivated plants for agricultural and horticultural use, the yield of fruits and the like can be significantly increased.

The plant to which the method is applied is not particularly limited.
For example, fruit plants such as cucumber, eggplant, pepper, pumpkin, watermelon, makuwauri, melon, okra, strawberry, tomato; grapes, pear, apple, peach, cherry,
Fruit plants such as oysters, tangerines, kiwi; Bean plants such as kidney beans, broad beans, peas, soybeans, peanuts, adzuki beans, and soybeans; Rice, barley, wheat, oats,
Cereals such as millet, millet, buckwheat, corn; lily,
Flower plants such as tulips, gladioli, carnations, and roses; and industrial plants such as cotton.

Among them, vegetable plants such as cucumber, eggplant, pepper and tomato, fruit tree plants such as apple, grape, pear, peach, cherry and oyster, bean plants such as soybean and kidney beans, and industrial crops such as cotton. Effective and preferably applied.

The site of application of the peanut inhibitor of the present invention is not particularly limited, since it has the ability to penetrate into plants. It may be applied to the entire target plant, or to a part of the plant such as the foliage and inflorescence. The method of application may be appropriately selected according to the formulation of the peanut inhibitor. For example, an aqueous solution obtained by diluting the undiluted solution with water may be sprayed, sprayed, or applied to the whole or a part of the target plant. The application time is not particularly limited, but is usually several seconds to several minutes per individual plant.

The application time is not uniform depending on the type of plant and weather conditions, and is not particularly limited, but is preferably a period from two weeks before flowering to two weeks after flowering. Although the number of applications is not particularly limited, it is usually applied once or divided into several times.

The concentration of the jasmonic acid compound used when applying the peanut inhibitor of the present invention may be appropriately selected according to the kind of the target crop, the application form, the application method, the application time, and the like. For example, the concentration of a jasmonic acid-based compound when the present drug is diluted with water or the like is usually 0.1.
05 to 200 ppm, preferably 0.1 to 150 pp
m, more preferably from 1 to 100 ppm, most preferably from 5 to 50 ppm.

[0042]

The present invention will be described below with reference to examples and comparative examples, but the present invention is not limited thereto.

Examples 1-2, Comparative Examples 1-2: Grapes
(Kyoho) Applicability Test Liquid containing 5% by weight of n-propyl (2-n-pentyl-3-oxo-cyclopentyl) acetate (general name: prohydrojasmon) [water: ethanol = 50: 50]
(V / v)] was diluted 3,000 times (Example 1) and 5,000 times (Example 2) with water to prepare reagent solutions, respectively. In addition, a control drug solution (Comparative Example 1) was prepared by diluting a commercially available liquid solution containing 10% by weight of 2-chloroethylphosphonic acid (generic name: ethephon) 6,000-fold with water.

At the time when 6 to 7 new true leaves of Kyoho cultivated in the orchard were developed, the inflorescences were arranged according to the conventional cultivation method, and then the test plots of the above two types of reagent solutions (Example 1) -2) and a test section of a control drug solution (Comparative Example 1) were provided, and each drug solution was evenly applied once to the flower cluster and the new sheath of the grape. In addition, a non-treatment section where no chemical solution was sprayed was provided (Comparative Example 2).
Thereafter, conventional cultivation was performed under natural weather conditions. Table 1 shows the results of examining the average number of nucleated kernels per bunch of the grapes of each test plot during the harvest season.

[0045]

[Table 1]

Since the grape (Kyoho) grows in a new sheath before flowering, the physiological balance between the vegetative growth of the new sheath and the growth of the young fruit is broken, and it is difficult to stabilize the fruiting rate. However, as is clear from Table 1, the average number of nucleated grains per tress in the chemical treatments of Examples 1 and 2 was higher than that in the control chemicals and the non-treatment, and the remarkable peanuts on the grapes were increased. A preventive effect was observed.

Examples 3-8, Comparative Examples 3-4: cherry
And peach applicability test The same liquid agent used in Examples 1 and 2 was 1,000 times (Examples 3 and 6) and 5,000 times (Examples 4 and 7) with water.
Reagent solutions diluted 0000-fold (Examples 5 and 8) were prepared. Then, using cherry (cultivar: Satonishiki, Examples 3 to 5) and peach (cultivar: Hakuho, Examples 6 to 8) cultivated in the orchard, three days after the completion of the pollination operation, the flowers and foliage were applied to the respective flowers and foliage. Three types of chemicals were evenly applied. Thereafter, conventional cultivation was performed under natural weather conditions.
The effect of the drug was evaluated by the fruit set rate (B ÷ A × 100) calculated from the number of fruits in the mature stage (B) with respect to the total number of flowers in the immature stage (A) in each test plot. Table 2 shows the fruit set rate of each test group with the untreated group as Comparative Examples 3 and 4.

[0048]

[Table 2]

As is clear from Table 2, Examples 3 to 8
It was found that treatment of this agent during the flowering period (3 days after the pollination operation) can suppress fruit drop of immature fruits of cherry and peach.

Examples 9 to 14, Comparative Examples 5 to 6: Soybean
Example 3- Application test to cotton and soybean using soybean and cotton cultivated on the farm
Three kinds of reagent liquids having different dilution rates similar to those of Example 8 were applied (1,000 times dilution: Examples 9 and 12, 5,000 times dilution: Examples 10 and 13 and 10,000 dilution).
0 magnification: Examples 11 and 14). In the soybean test, the medicinal solution was sprayed once on the foliage in the early stage of flowering, and each test group (Example 9) was used.
-11, 50 strains), the ratio (%) of the harvest weight to the untreated plot (Comparative Example 5, 50 strains), that is, the harvest rate (%) was determined. In the cotton test, the medicinal solution was sprayed once on the foliage in the early stage of flowering, and each test group (Examples 12 to 1) was used.
(4, 10 strains each), the number of flowers that blossomed from the day of spraying to 20 days later was recorded, and the ratio of the number of fruit set to the total number of flowers, that is, the fruit set rate (%) was determined. In addition, the untreated area was compared with Comparative Example 6.
As the fruiting rate (%). Table 3 shows the results of these tests.

[0051]

[Table 3]

Since soybeans and cotton have a longer flowering period than other cultivated plants, they are susceptible to weather changes during the flowering period and are crops whose yield is unstable. It is also said that 70-80% of soybeans may not bear fruit. However, as apparent from Table 3, Examples 9 to
It was found that by applying 14 chemicals during the flowering period, peanuts were suppressed and the yield (soybean) and the fruit set (cotton) increased.

[0053]

As described above, the use of the plant peanut inhibitor of the present invention makes it difficult for plants, especially various cultivated plants for agricultural and horticultural use, to be affected by weather changes such as low temperature, dryness and long rain, and flowering. The effects of preventing flowering during the season, preventing fruit drop of immature fruits, improving the fruit set rate, and increasing the stable production and yield of agricultural and horticultural crops can be obtained.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kazuki Watanabe 1-2-1 Yoko, Kawasaki-ku, Kawasaki-shi, Kanagawa F-term in the Zeon Corporation General Development Center (reference) 2B022 EA10 4H011 AB03 BA01 BB06 BC03 BC18 DA13 DD03 DE15

Claims (2)

[Claims] 1. A compound of the general formula (1) (Wherein, R ¹ represents a hydrocarbon group, and R ² represents a hydrogen atom or a hydrocarbon group). A jasmonic acid compound represented by the formula: Agent. 2. A method for preventing peanuts, which comprises applying the peanut inhibitor according to claim 1 to a plant.