JP2001328910A - Flower-thinning agent for fruit trees - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flower-thinning agent for fruit trees (except apple trees) that inhibits the chemical damage particularly without adverse effect on the environment, can be handled easily with high safety and can manifest stabilized flower-thinning effect with reduced fluctuation in regional, climatic and other differences by using an aliphatic organic acid, an ester thereof or a metallic salt of the aliphatic organic acid (except the calcium salt) as an active ingredient. SOLUTION: This invention relates to a flower-thinning agent for the fruit trees that bear their fruits by pollination and is characterized by including an aliphatic organic acid, an ester thereof or a metallic salt thereof (except the calcium salt) as an active ingredient.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an orchard for fruit trees containing, as an active ingredient, an aliphatic organic acid or an ester thereof or a metal salt of an aliphatic organic acid (excluding a calcium salt). In addition, it suppresses phytotoxicity, is easy to handle, is extremely safe, and exhibits a stable flower-picking effect with little variation with respect to differences in areas and weather. Excluding).

[0002]

2. Description of the Related Art When many fruit trees are left in a natural state after flowering and pollination, the majority of the pollinated flowers are fruited as they are, resulting in excessive fruiting, and the nutrients supplied from the trees to individual fruits are fragmented, Less nutrients are distributed per piece. As a result, there are problems that the fruit is small, the quality is poor, and the commercial value is reduced. In addition, a heavy burden is imposed on the trees, and the number of flower buds in the following year decreases, which causes a problem of insufficient fruit set.

[0003] In order to solve these problems, in orchard cultivation, an appropriate number of flowers and fruits have been thinned out to remove only good-quality flowers and fruits, or a thinning operation. As a result, the amount of nutrients distributed per fruit increases, so the quality is improved, and
For trees, the burden is reduced, and the next year's flower buds can be expected. Conventionally, these operations have been performed manually by farm workers or the like.

[0004] However, in order to fully exert the effects of the flowering (fruit) work, the work must be completed in a short period of time. And the cost involved was substantial.

[0005] In recent years, to solve these problems, attention has been paid to "flower removers" and "fruit removers", which treat flowers with flowers and fruits immediately after fruiting (fruits).

[0006] Here, a fruit thinner is one that is treated at an appropriate time after fruiting to drop excess fruit and grow only high-quality fruit. At present, figalone is used as a fruit thinner for citrus (citrus mandarin orange). (Ethiclosate agent) and Elamica (dichlorprop agent), and those having NAC (carbaryl) (denapon agent) as an active ingredient as an exfoliating agent for apples are commercially available.

[0007] However, although thinning with such a thinning agent assists in early fruiting, it does not always result in early proper fruit setting. Therefore, even in the case of scattered trees, manual thinning is indispensable. In addition, carcinogenicity and teratogenicity have been reported with respect to the above-mentioned denapon agent, and weakness of the tree with application of figalone has been reported. It is said that it is necessary.

[0008] On the other hand, flower removers are used during the flowering period to remove excess flowers and to set and grow only necessary flowers. Unlike fruit removers, flower removers are used before fruit set, that is, during flowering. It is superior to the above-mentioned fruit thinners, and is extremely important, in that it reduces the burden on trees, which increases excess fruit, as much as possible.

At present, the above-mentioned flower removers include those containing a lime-sulfur mixture as an active ingredient for the purpose of flower removal of apples,
Research and development of those containing calcium alkylbenzenesulfonate as an active ingredient, and those containing a 2-methyl-4-chlorophenoxybutyric acid-based compound disclosed in Japanese Patent Application Laid-Open No. Hei 7-118108 as an active ingredient have been studied and developed. Is also circulating.

However, among these flowering agents, the lime-sulfur mixture is susceptible to the effects of climate and regional differences, and has a short duration of effect.
There are drawbacks that require four treatments and require a great deal of labor. In addition, phytotoxicity such as browning appears on the leaves,
When mixed into honey, emits a stench based on sulfur,
The quality may be reduced.

In addition, since the lime-sulfur mixture is liable to generate toxic hydrogen sulfide when mixed with an acidic fertilizer, sufficient care must be taken for its use.

[0012] Next, those containing calcium alkylbenzenesulfonate as an active ingredient are disadvantageous in that the flowering effect varies, the stable effect cannot be obtained, and the activity is weak. After the treatment of the agent, fruit damage such as so-called "rust" occurs,
May degrade quality.

Japanese Patent Application Laid-Open No. Hei 7-118108 discloses a composition containing a 2-methyl-4-chlorophenoxybutyric acid-based compound as an active ingredient, in which the leaf is curled or temporarily sags. On the other hand, when using such an orchard for fruit trees, it is generally dissolved in an organic solvent such as xylene,
Further, since an emulsion prepared by adding an emulsifier is diluted with water and used, handling is inconvenient.

In addition, there is a risk that an organic solvent such as xylene contained in the emulsion may adversely affect the environment.
In addition, if monochlorophenol used as a raw material for synthesizing a 2-methyl-4-chlorophenoxybutyric acid-based compound has many impurities, harmful dioxins are mixed in the 2-methyl-4-chlorophenoxybutyric acid-based compound. May come.

In addition, the 2-methyl-4-chlorophenoxybutyric acid-based compound itself or its hydrolyzing component may become an environmental hormone, and its use requires considerable care.

Previously, the present inventors have conducted intensive studies in order to eliminate the drawbacks of the above-mentioned flower disinfectant. As a result, the present invention does not adversely affect the environment, suppresses phytotoxicity, is easy to handle, and is extremely safe. Therefore, there is little variation with respect to differences in area, weather, etc., and there is no risk of becoming an environmental hormone.
About an apple flowering agent that shows a stable flowering effect,
Invented and filed an application (Japanese Patent Application No. 11-837).

As a result of further studies, the present inventors have found that the apple flower disinfectant described in the specification of Japanese Patent Application No. 11-837 is not only an apple,
The present inventors have found that the present invention exerts a stable flower-picking effect on other fruit trees such as peach, citrus, citrus (excluding parthenocarpic varieties), and the like, which bears fruit by pollination, thereby completing the present invention.

That is, the present inventors have disclosed an apple described in the specification of Japanese Patent Application No. 11-837 containing an aliphatic organic acid, an ester thereof, or a metal salt of an aliphatic organic acid as an active ingredient. When applied to not only apples, but also fruit trees that bear fruit by pollination, such as peach, none, citrus (excluding parthenocarpic varieties), etc., it has no phytotoxicity and has a stable flowering action. It has been found that it can be an excellent flowering agent to be expressed.

In addition, since the aliphatic organic acids and the like can be easily synthesized and have no benzene ring or the like in the molecule,
It has been found that it is easily decomposed in the natural environment, has little effect on the environment, does not become an environmental hormone, and can be used easily and safely.

Further, by diluting and using these orchards for fruit trees, phytotoxicity can be suppressed. In addition, differences in areas (differences in locations and directions of orchards),
It has been found that there is little variation even in a difference in weather (regardless of whether it is rainy or sunny) and a stable flowering effect can be obtained.

In particular, among such aliphatic organic acids, those using a water-soluble aliphatic organic acid or the like as an active ingredient should be diluted to an arbitrary concentration with only a harmless solvent such as water. It can be used without mixing with organic solvents or emulsifiers that may adversely affect the environment or become an environmental hormone, resulting in the finding that it is safer and easier to handle. .

The present invention has been completed on the basis of these findings, and is an aliphatic organic acid, an ester thereof, or a metal salt of an aliphatic organic acid (excluding a calcium salt).
By containing as an active ingredient, in particular, it does not adversely affect the environment and suppresses phytotoxicity, is easy to handle, and is extremely safe, and has a small variation with respect to differences in area, weather, etc. An object of the present invention is to provide an orchard for fruit trees (except for apples) which exhibits an inflorescence effect.

[0023]

Means for Solving the Problems The flower-plucking agent for fruit trees according to the present invention (except for apples; the same applies hereinafter) is a flower-plucking agent used for fruit trees which bear fruit by pollination in order to achieve the above object. The flowering agent for fruit trees is characterized by containing an aliphatic organic acid or an ester thereof or a metal salt of an aliphatic organic acid (excluding a calcium salt) as an active ingredient.

More specifically, the flowering agent for fruit trees of the present invention comprises:
It has the effect of suppressing the growth of the pollen tube of pollinated pollen, and therefore, exhibits an excellent flowering effect on fruit trees that bear fruit by pollination, and as specific examples of these fruit trees, none, peach, Fruit trees such as citrus fruits (excluding parthenocarpic varieties) and the like, and other fruits that bear fruit by flowering and pollination.

The aliphatic organic acid used as an active ingredient of the orchard extract for fruit trees of the present invention may be an aliphatic organic acid having no benzene ring or the like which may adversely affect the environment in its molecular structure. It is not particularly limited as long as it is a saturated aliphatic organic acid, and may be an unsaturated aliphatic organic acid. Further, it is not limited to monobasic acids, but may be polybasic acids having two or more carboxyl groups in one molecule.

Specifically, formic acid, acetic acid, propionic acid,
Monobasic acids such as butyric acid, valeric acid, caproic acid, and caprylic acid; dibasic acids such as oxalic acid, malonic acid, succinic acid, glutaric acid, and adipic acid; tribasic acids such as citric acid; and non-basic acids such as itaconic acid And saturated polybasic carboxylic acids.

In particular, among the above polybasic acids, itaconic acid is a substance stable at ordinary temperatures under acidic, neutral and weakly basic conditions, so that the fluctuation of the flowering effect due to the dilution ratio during use is small. It is particularly preferable because it shows a stable flowering effect, and also shows a safe value in an acute toxicity test using rats (oral LD50: 4000 mg / kg, intraperitoneal LD50: 450 mg / kg), which is extremely high in safety. Is particularly preferred.

In addition, itaconic acid can be synthesized in a larger amount than molasses, so that it can be obtained inexpensively and in a large amount. In this respect, it is particularly preferable.

As the ester of the aliphatic organic acid used as an active ingredient of the orchard for fruit trees in the present invention, the hydrogen atom of the carboxyl group of the aliphatic organic acid is replaced with an alkyl group such as a methyl group, an ethyl group, or a propyl group. Substituted compounds are exemplified.

In particular, in the present invention, the polybasic acid ester is preferably a monosubstituted ester in which one of a plurality of hydrogen atoms of a carboxyl group present in one molecule is substituted with an alkyl group, or an ester in which two or more are substituted. Polysubstituted esters are particularly preferred because they exhibit small fluctuations in pH depending on the dilution ratio during use and exhibit a stable flowering effect.

The metal salt of an aliphatic organic acid used as an active ingredient of a flowering agent for fruit trees in the present invention includes salts of alkali metals such as sodium salt and potassium salt of the above-mentioned aliphatic organic acid, magnesium salt, barium salt and the like. And the like, salts of alkaline earth metals.

Particularly, in the case of metal salts of polybasic acids, monosubstituted metal salts in which one of a plurality of hydrogen atoms of a carboxyl group present in the molecule is substituted with the above-mentioned metal, or polysubstituted metal salts in which two or more are substituted are mentioned. It is particularly preferable because pH fluctuation due to the dilution factor during use is small and a stable flowering effect is exhibited.

However, among the metal salts of the aliphatic organic acids in the present invention, it is difficult to obtain the desired flowering effect of the calcium salt, and therefore, metal salts other than the calcium salt are used from the viewpoint of the effect. .

The aliphatic organic acid, or its ester or a metal salt of an aliphatic organic acid used as an active ingredient of the orchard for fruit trees in the present invention is soluble in water because of its environmental safety and easy handling. It is desirable, but if it is insoluble in water or if necessary, it may be mixed with a carrier or other adjuvants, formulated and sprayed.

As the carrier and other auxiliary agents, those conventionally used can be mentioned. Specifically, it can be used after being adjusted to coarse / fine powders, granules, wettable powders, emulsions, flowables and the like.

In formulating the orchard for fruit trees of the present invention, suitable carriers to be used can be either solid or liquid as long as they are usually used for agricultural and horticultural agents. It is not something to be done.

Examples of the solid carrier include mineral powders such as clay, talc, bentonite, calcium carbonate, diatomaceous earth, white carbon, vegetable powders such as soybean powder and starch, petroleum resin, polyvinyl alcohol, polyalkylene glycol and the like. A high molecular compound such as, urea,
Waxes and the like. Examples of the liquid carrier include water, aliphatic alcohols, and glycols.

As the auxiliary, surfactants, binders, stabilizers and the like which are usually used for agricultural and horticultural medicines can be used alone or in combination as needed.
Further, depending on the case, an industrial bactericide, a bactericidal or an antifungal agent may be added for germicidal or fungal protection. Examples of surfactants include known nonionic, anionic,
Organic surfactants such as cationic and zwitterionic,
Alternatively, an inorganic surfactant such as a phosphate ester salt may be used.

In the flower-picking agent for fruit trees according to the present invention, the application rate of the flower-picking agent containing an aliphatic organic acid or its ester or a metal salt of the aliphatic organic acid as an active ingredient is determined by the amount of the organic acid used as the active ingredient. Types, tangerines, peaches,
Since it differs depending on the type and variety such as none, it cannot be definitely determined.

In general, when the above-mentioned orchard for fruit trees is applied in an orchard or the like, the concentration thereof varies depending on the climate, weather, and the like in the orchard to which the orchard is to be applied. Has 0.025
In the range of 5%, preferably in the range of 0.05-2.5%,
Preferably, the concentration is in the range of 0.1 to 2%.
If the amount is less than 0.025%, the required flowering effect may not be obtained. On the other hand, if it exceeds 5%, the effect is limited, and at the same time, phytotoxicity such as browning on leaves and rust on fruits are generated. It is not preferable because of fear.

The concentration of the active ingredient at the time of use of the flower remover affects the pH of the diluent. This is particularly noticeable when water is used as the diluent. For example, when an aliphatic organic acid is used as an active ingredient and diluted with water,
The aqueous solution becomes weakly acidic and the pH drops as the concentration of the active ingredient increases. And since this pH has a great influence on the flowering effect and the occurrence of phytotoxicity, it is desirable to control the pH when diluting the flower remover of the present invention. It is desirable to use a buffer solution as a diluent for control. Of course, depending on the type of flowering agent used (for example, itaconic acid), p
Even when H is about 3, phytotoxicity may not occur, and in such a case, it is not necessary to strictly adjust the pH.

The buffer solution used for adjusting the pH does not adversely affect fruit trees and leaves, and has a pH of 5.0 to 5.0.
There is no particular limitation as long as there is a buffer capacity near 8.5 neutrality. Specific examples include buffer solutions such as a phosphate buffer solution and a carbonate buffer solution.

When the active ingredient of the orchard extract for fruit trees of the present invention is diluted (dilution of the active ingredient), the pH is 5.0 to 8.5.
Is preferably set in the range, and particularly preferably in the range of 6.0 to 8.0. In the acidic region where the pH is less than 5.0 or in the alkaline region where the pH is 8.5 or more, phytotoxicity caused by hydrogen ion concentration, such as rusting of fruits, withering of fruit trees, or withering of leaves, occurs. It is not preferable because it may occur.

In the flower-picking agent for fruit trees of the present invention containing these aliphatic organic acids, esters thereof, or metal salts of aliphatic organic acids as an active ingredient, the time of application can be set to the time of the initial flowering. It is preferable that citrus fruits (excluding parthenocarpic varieties) be used at the full bloom stage, since the third flower is left at the last stage of flowering, and citrus fruits (excluding parthenocarpic varieties) are obtained.

[0045]

The flower-picking agent for fruit trees of the present invention has the above-mentioned constitution, and has a stable and excellent flower-picking action with little variation even in terms of regional differences, weather, types of fruits, etc. with respect to flowering of fruit trees. It is.

That is, as will be apparent from the examples described later, the flower-picking agent for fruit trees of the present invention has a delay in the absence of the tip flower and citrus (excluding parthenocarpic varieties) compared to the untreated area. The percentage of residual fruits is remarkably reduced with respect to flowers (unnecessary flowers), has little effect on pollinated central flowers (none) and early flowering flowers (citrus), and has a high flowering effect.

In addition, there is no adverse effect on fruit trees, and there is no or almost no chemical damage such as leaf browning and leaf blight or occurrence of the epinasti phenomenon, and the effect is extremely high.

When the orchard extract for fruit trees of the present invention is diluted and used, by setting the pH of the solution in the range of 5.0 to 8.5, the chemical damage can be more reliably suppressed. In addition, a stable flower-picking effect with little variation can be obtained even with respect to differences in the type of fruit tree, fruit quality, region, weather, etc., thereby exhibiting a safe and stable excellent flower-picking action. is there.

Moreover, the aliphatic organic acids and the like can be easily synthesized and have no aromatic ring such as a benzene ring in one molecule, so that they are easily decomposed in the natural environment, and the adverse effect on the environment is extremely low. It is small and can be used safely.

Among them, those containing an aliphatic organic acid or the like soluble in water as an active ingredient can be diluted to an arbitrary concentration with only a harmless solvent such as water, and as a result, there is no adverse effect on the environment. It does not need to be mixed with an organic solvent or an emulsifier which may give, and can be used safely and has an action of extremely easy handling.

In particular, itaconic acid as the above-mentioned aliphatic organic acid, in addition to the above-mentioned action, is more stable against flowering of fruit trees and exhibits an extremely excellent flowering effect.
It is inexpensive and extremely safe for the human body and the environment.

[0052]

The present invention will be described below in detail with reference to examples, but the present invention is not limited to these examples.

Fruit Tree As a fruit tree, a tree of none (variety: Kosui) (planting distance: 5.0
mx 2.5 m).

Example 1a After artificially pollinating the central flower of the fruit tree without the above, 3
After two days and five days later, sodium formate was used as the active ingredient of the flowering agent, and a 300-fold water-diluted solution (pH
6.79). The treatment was a branching treatment, and about 2.5 liters were sprayed with a shoulder sprayer.

Example 1b Sodium formate was used as an active ingredient of a flower remover and diluted 100-fold with a 0.1 M phosphate buffer solution. This solution was adjusted to pH 7.
It was adjusted to 0 and sprayed in the same manner as in Example 1. The adjustment of the pH in the following Examples was performed by adding a 0.1N aqueous hydrochloric acid solution (or a 0.1N aqueous sodium hydroxide solution) to the 0.1M phosphate buffer solution.

Example 2 Acetic acid was used as an active ingredient of a flowering agent and diluted 100-fold with a 0.1 M phosphate buffer solution. This solution was adjusted to pH 7.0 and sprayed in the same manner as in Example 1.

Reference Example 1 A 100-fold water-diluted solution (pH 3.19) was sprayed in the same manner as in Example 1 above, using acetic acid as an active ingredient of the flowering agent.

Example 3a Ethyl butyrate was used as an active ingredient of a flower remover, and a 300-fold diluted solution of this (pH 5.43) was sprayed in the same manner as in Example 1 above.

Example 3b Ethyl butyrate was used as an active ingredient of a flower remover, and a 100-fold diluted water solution (pH 5.34) was sprayed in the same manner as in Example 1 above.

Example 4a Itaconic acid was used as an active ingredient of a flower remover, and a 300-fold diluted solution of this (pH 3.10) was sprayed in the same manner as in Example 1 above.

Example 4b A 100-fold diluted water solution (pH 2.88) of itaconic acid was used as an active ingredient of a flower remover in the same manner as in Example 1 above.

Example 5a Malonic acid was used as an active ingredient of a flowering agent, and a 300-fold diluted water solution (pH 2.58) was sprayed in the same manner as in Example 1 above.

Example 5b Malonic acid was used as an active ingredient of a flower remover, and a 100-fold diluted water solution (pH 2.33) was sprayed in the same manner as in Example 1 above.

Example 6a Citric acid was used as an active ingredient of a flower remover, and a 300-fold diluted solution of this (pH 2.86) was sprayed in the same manner as in Example 1 above.

Example 6b Citric acid was used as an active ingredient of a flower remover, and a 100-fold water dilution (pH 2.65) thereof was sprayed in the same manner as in Example 1 above.

Comparative Example 1 Lime-sulfur mixture used as a flower remover for apples was used as an active ingredient of a flower remover and diluted 100 times with water (p.
H11.42) was sprayed in the same manner as in Example 1.

Comparative Example 2 Ethyl 2-methyl-4-chlorophenoxybutyrate
An ECP (e.g., MCPB ethyl) emulsion was used as an active ingredient of a flowering agent, and a 6,000-fold dilution of this emulsion with water was sprayed in the same manner as in Example 1. The MCPB ethyl emulsion was prepared by mixing and stirring 20 parts by weight of the MCPB ethyl, 73 parts by weight of xylene, 3 parts by weight of polyoxyethylene alkyl ether, 2 parts by weight of polyoxyethylene alkyl ester, and 2 parts by weight of calcium dodecylbenzenesulfonate. To obtain an emulsion.

After 30 days from the treatment, Table 1 shows the results obtained by examining the flowering effect and phytotoxicity of Examples 1a to 6b, Reference Example 1, Comparative Examples 1 and 2, and no treatment.

[0069]

[Table 1]

The flowering effect was determined by comparing the number of flowers on the treatment day with the number of normal fruits on the survey day for the center flower and the side flowers, and expressing them in percentage. Table 2 shows the observation results of leaf states such as fallen leaves, discolored leaves, malformed leaves, and the like.

[0071]

[Table 2]

From the results shown in Tables 1 and 2, it was confirmed that the fruit of each example had no phytotoxicity and exhibited a moderate flowering effect on the fruit trees without the above.

The currently used flower removers of Comparative Examples 1 and 2 show a certain degree of flowering effect, but the occurrence of chemical damage such as browning and the epinasti phenomenon was observed.

On the other hand, in Example 1b or Example 2, these monobasic acids or metal salts thereof were diluted with a buffer solution and the pH was adjusted to suppress the phytotoxicity which might be caused by the pH. It was recognized that it was possible.

On the other hand, in the case of using an ester, a dibasic acid or a tribasic acid as an active ingredient as in Examples 3a to 6b, the fluctuation of pH is small in a wide concentration range.
It was found that there was no phytotoxicity due to pH and a stable flowering effect with little variation was exhibited.

[0076]

The flowering agent for fruit trees (except for apples) according to the present invention contains an aliphatic organic acid or its ester or a metal salt of an aliphatic organic acid (excluding a calcium salt) as an active ingredient. As a result, in the flowering of the fruit tree, the variation is small and stable with respect to differences in area, weather, kind of fruit, and the like, and the flowering effect is extremely excellent.

That is, in the flower-picking agent for fruit trees according to the present invention, the rate of residual undesired flowers was remarkably reduced as compared with the untreated area, and the central flower and citrus (polluted result) without pollination were observed. (Excluding sexual varieties) has little effect on delayed flowers and has an extremely high flowering effect.

Moreover, the flowering agent for fruit trees according to the present invention does not adversely affect fruit trees and fruits, and has little or no phytotoxicity such as leaf browning or leaf dying or occurrence of the epinasti phenomenon. It has the effect of high safety.

Further, in the flower-picking agent for fruit trees according to the present invention, when diluted and used, the pH of the solution is adjusted to 5.
By setting it in the range of 0 to 8.5, phytotoxicity can be more reliably suppressed, and the variation in the type of fruit tree, fruit quality, region, weather, etc. is further reduced. As a result, a stable flowering effect can be obtained, whereby a safe, stable and excellent flowering effect can be obtained.

Furthermore, in the flower-picking agent for fruit trees according to the present invention, the active ingredients such as aliphatic organic acids can be synthesized extremely easily, and since the molecule does not have a benzene ring or chlorine in the molecule, it can be used in natural environment. It is easily decomposed inside, has little effect on the environment, and has effects such as safe use.

In the flower-picking agent for fruit trees according to the present invention, in particular, when a water-soluble organic acid or the like is used as an active ingredient, it can be diluted to an arbitrary concentration with harmless water alone. There is no need to mix it with an organic solvent or emulsifier that may adversely affect the environment, and it can be used safely.
This has the effect of making handling extremely simple.

In particular, when itaconic acid is used as the aliphatic organic acid in the orchard for fruit trees according to the present invention, in addition to the above-mentioned effects, it exhibits a more stable and extremely excellent flowering effect on the orchard of fruit trees. It is advantageous in that it is inexpensive and more safe for the human body and the environment.

In addition, the flowering agent for fruit trees according to the present invention contains, as an active ingredient, an aliphatic organic acid having no benzene ring or chlorine content, or an ester thereof or a metal salt of an aliphatic organic acid. When used with the pH set within the above range, there is no adverse effect on the environment, and
There is no generation of environmental hormones, and phytotoxicity can be extremely suppressed.
It exhibits a stable and excellent flowering effect, and its usefulness is extremely large.

Claims (5)

[Claims] 1. A flower remover used for fruit trees that bear fruit by pollination, wherein the flower remover for fruit trees is an aliphatic organic acid, an ester thereof, or a metal salt of an aliphatic organic acid (excluding a calcium salt). ) As an active ingredient, a flowering agent for fruit trees (except for apples). 2. The flowering agent for fruit trees according to claim 1, wherein the aliphatic organic acid is a monobasic acid. 3. The flowering agent for fruit trees according to claim 1, wherein the aliphatic organic acid is a polybasic acid having two or more carboxyl groups in one molecule. 4. The flowering agent for fruit trees according to claim 3, wherein the polybasic acid having two or more carboxyl groups in one molecule is itaconic acid. 5. The flowering agent for fruit trees according to claim 1, wherein the metal salt of the aliphatic organic acid is an alkali metal salt or an alkaline earth metal salt.