JPH08319206A - Noxious life controlling agent and stabilization of noxious life controlling agent - Google Patents

Abstract

PURPOSE: To obtain a noxious life controlling agent having long-term storage stability by adding a specific stabilizing agent to a system containing gelatinized starch. CONSTITUTION: Gelatinized starch is incorporated with a phosphoric acid salt as a stabilizer and further with a surfactant and water. As necessary, a preparation assistant such as an anti-freezing agent is added to the system. The phosphoric acid salt is preferably an acidic alkali metal salt or an acidic ammonium salt, especially dipotassium hydrogen phosphate and its amount is preferably 0.5-10wt.% based on the total composition. The gelatinized starch is produced by gelatinizing natural starch obtained from potato, sweet potato, wheat, corn, tapioca, sago, rice, etc., or processed starch obtained by various treatments of the above starch. The gelatinization treatment is carried out by hot-water treatment, etc. The amount of the gelatinized starch is 0.5-10wt.% based on the total composition. The surfactant is e.g. dialkyl sulfosuccinate and its amount is 0.5-10wt.% based on the total composition.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a pest control agent.

[0002]

2. Description of the Related Art A method of spraying an aqueous solution containing a water-soluble polymer such as gum arabic for controlling minute pests such as spider mites is known in JP-A-58-109402.

[0003]

By the way, in order to develop a practical product, it is not a spray liquid of such a pest control agent, but a solid preparation such as a powder or a concentrated liquid to be diluted with water for use. It is necessary to consider formulation suitable for distribution such as. However, in a powdery formulation containing a water-soluble polymer, storage stability for a long period of time is not sufficient, and it causes solidification immediately and poor water dilutability.
Even in the preparation of a concentrated solution containing a water-soluble polymer, long-term storage stability is not sufficient. For example, when the concentrated solution is stored at low temperature, the concentrated solution may separate into two layers or gelation may occur. Since the water dilutability is poor and it becomes difficult to dilute it uniformly, practical application has not progressed. Therefore, it has been desired to develop a formulation which is more effective in controlling pests than other water-soluble polymers and has excellent long-term storage stability.

[0004]

The present inventors have found that a pest controlling agent containing pregelatinized starch has excellent pest controlling activity, and further, the pest controlling agent is formulated into a concentrated solution. In the process of studying the utilization, it was found that the addition of phosphate is effective for maintaining long-term storage stability. That is, the present invention is a pest control agent containing a pregelatinized starch, a surfactant, a phosphate and water and having excellent long-term storage stability (hereinafter referred to as "the composition of the present invention").
It is written. ), In particular, pest control agents which consist essentially of pregelatinized starch, surfactants, phosphates, water and optionally further formulation auxiliaries. The present invention also provides a method for stabilizing a pest control agent containing a pregelatinized starch to which a phosphate is added.

As the phosphate used in the present invention, a phosphate which is an acidic salt (hydrogen salt), that is, a monohydrogen phosphate salt or a dihydrogen phosphate salt is usually used, and an alkali metal salt or ammonium salt is used. The use of salt is preferred. Specific examples of the phosphate include dipotassium hydrogen phosphate, potassium dihydrogen phosphate, diammonium hydrogen phosphate, ammonium dihydrogen phosphate, disodium hydrogen phosphate and the like.

The amount of phosphate required to stabilize pesticides containing pregelatinized starch is generally 0.5 to 10% by weight, preferably 1% by weight, based on the total weight of the composition of the present invention. The amount is about 5% by weight.

As the pregelatinized starch to be used in the composition of the present invention, natural starch obtained from potato, sweet potato, wheat, corn, tapioca, sago, rice or the like or processed starch obtained by subjecting it to various kinds of hot water is used. Those which have been made into α by treatment or the like are used, and generally 0.5 to 10% by weight, preferably 1 to 5% by weight based on the total amount of the composition of the present invention.
Included to some extent.

There are no particular restrictions on the surfactant used in the composition of the present invention. For example, Air Roll C
Dialkyl sulfosuccinate type such as T-1 (Toho Chemical Industry), Neocor YSK (Daiichi Kogyo Seiyaku), acetylene glycol type such as Surfynol 104 (Nissin Chemical), NUC SILICONE L-77 (Nippon Unicar) Manufactured by K.K.) and KF-618 (manufactured by Shin-Etsu Chemical Co., Ltd.) and the like. The surfactant is generally 0.5 to 10% by weight, preferably 1 to the total amount of the composition of the present invention.
Approximately 5% by weight is contained.

The composition of the present invention comprises an antifreezing agent, an organic solvent,
It may also contain formulation aids such as dyes and fragrances. As the antifreezing agent, for example, glycerin, ethylene glycol, propylene glycol, polyethylene glycol,
Examples thereof include polypropylene glycol, and when the antifreezing agent is used, it is generally contained in an amount of about 5 to 20% by weight based on the total amount of the composition of the present invention.

The composition of the present invention is a pest control agent containing a pregelatinized starch, a surfactant, a phosphate and water and having excellent long-term storage stability, and particularly, the pregelatinized starch and the surfactant. , Phosphates and water, and, if necessary, auxiliaries for formulation such as antifreezing agents.

In the composition of the present invention, for example, water is put in a stirring tank, components such as pregelatinized starch and a surfactant are added with stirring, and if necessary, heated to about 30 to 90 ° C., It can be manufactured by mixing.

The composition of the present invention is used by diluting with water,
The application concentration varies depending on the type of pests to be treated, the state of occurrence, weather conditions, etc., but generally the concentration of pregelatinized starch is 100 to 10,000 ppm, preferably 500
~ 5000 ppm. The composition of the present invention is sprayed on a pest or a plant in which a pest is generated, using a spraying machine such as a power sprayer, a shoulder sprayer, and a hand sprayer,
Citrus, apples, pears, citrus mites that harm fruit trees such as peaches, spider mites, spider mites such as kanzawa mites, rust mites, aphids of thrips, aphids such as cotton aphids, peach aphids, moss mites that injure tea, pests of thrips, Aphids, eggplants, cucumbers, tomatoes, spider mites that harm vegetables such as peppers, aphids, thrips pests, whitefly, whitefly, tobacco whitefly, carnations, roses,
It is used for the control of small pests such as spider mites, aphids, thrips, pests, thrips, whitefly, tobacco whitefly, etc. that control flowers such as chrysanthemum, gypsophila, poinsettia, and powdery mildew of various crops.

[0013]

EXAMPLES The present invention will now be described with reference to examples, but the present invention is not limited to the following examples. Formulation Example 1 6 parts by weight of alferated starch (Matsunoline M-22, manufactured by Matsutani Chemical Industry Co., Ltd.), 10 parts by weight of propylene glycol and 77.8 parts by weight of water are mixed with stirring. Further, 3 parts by weight of a silicone-based surfactant (NUC SILICONE L-77, manufactured by Nippon Unicar), 3 parts by weight of dipotassium hydrogen phosphate and 0.2 parts by weight of a fungicide (Proxel GXL, manufactured by Zeneca) were added and stirred. An aqueous solution was obtained.

Formulation Example 2 6 parts by weight of alfa-starched starch (Amicol W, manufactured by Nitto Kagaku), 10 parts by weight of propylene glycol and 77.8 parts by weight of water are mixed with stirring. Further, 3 parts by weight of a silicone-based surfactant (KF-618, manufactured by Shin-Etsu Chemical), 3 parts by weight of dipotassium hydrogen phosphate and 0.2 part by weight of a fungicide (Proxel GXL, manufactured by Zeneca) are added and stirred to prepare an aqueous solution. Got

Formulation Example 3 6 parts by weight of alferized starch (Matsunoline M-22, manufactured by Matsutani Chemical Industry Co., Ltd.), 10 parts by weight of propylene glycol and 77.8 parts by weight of water are mixed with stirring. Furthermore, 3 parts by weight of a silicone-based surfactant (NUC SILICONE L-77, manufactured by Nippon Unicar), diammonium hydrogen phosphate 3
Parts by weight and antifungal agent (Proxel GXL, manufactured by Zeneca)
0.2 parts by weight was added and stirred to obtain an aqueous solution.

Next, examples of comparative formulations used in the test examples described below are shown. Comparative Preparation Example A preparation for comparison was obtained in the same manner as in Preparation Example 1 except that 3 parts by weight of dipotassium hydrogen phosphate was not used and the amount of water used was 80.8 parts by weight.

Next, a test example will be shown. Test Example 1 Each of the formulations obtained in Formulation Examples 1 to 3 and Comparative Formulation Example was filled in a polyethylene bottle with 100 ml and stored at 25 ° C. for 1 month, and then the properties of each formulation were observed. Each of the formulations obtained in Formulation Examples 1 to 3 was translucent and showed no change in uniform appearance, whereas the formulation obtained in Comparative Formulation Example was white and opaque, and liquid separation was observed. .

Test Example 2 Each of the formulations obtained in Formulation Examples 1 to 3 and Comparative Formulation Example was filled in a polyethylene bottle with 100 ml and stored at -5 ° C for 1 week, and the properties of each formulation were observed. In each of the formulations obtained in Formulation Examples 1 to 3, no change was observed in the translucent and uniform appearance, whereas in the formulation obtained in Comparative Formulation Example, the liquid separated into two layers and gelled. Occurred, and it could not be easily and uniformly redispersed.

[0019]

The composition of the present invention has excellent storage stability.
Further, according to the method of the present invention, a pest control agent containing pregelatinized starch can be stabilized.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical display location A01N 65/00 A01N 65/00 Z (72) Inventor Minami Futami 4-2 Takashi, Takarazuka-shi, Hyogo Prefecture No. 1 Stock company Agros (72) Inventor Toshiro Otsubo 4-2-1 Takashi Takarazuka-shi, Hyogo Sumitomo Chemical Co., Ltd.

Claims (7)

[Claims] 1. A pest control agent comprising pregelatinized starch, a surfactant, a phosphate and water. 2. A pest control agent, which consists essentially of pregelatinized starch, a surfactant, a phosphate, water and, if necessary, an auxiliary agent for formulation. 3. The pest control agent according to claim 1 or 2, wherein the phosphate is an alkali metal salt and an acidic salt, or an ammonium salt and an acidic salt. 4. The pest control agent according to claim 1, wherein the phosphate is dipotassium hydrogen phosphate. 5. A method for stabilizing a pest control agent, which comprises adding a phosphate to the pest control agent containing pregelatinized starch. 6. The method for stabilizing a pest control agent according to claim 5, wherein the phosphate is an alkali metal salt and an acid salt or an ammonium salt and an acid salt. 7. The method for stabilizing a pest control agent according to claim 5, wherein the phosphate is dipotassium hydrogen phosphate.