KR19980054661A - Insecticidal microcapsule composition for hydrogen ion concentration cognitive degradable cockroach attractant toxicant and preparation method thereof - Google Patents

Abstract

The present invention relates to an insecticidal microcapsules composition for cockroach attractant. More specifically, the present invention is a hydrophobic core material of microcapsules containing organophosphorus insecticides or carbamate insecticides and saturated fatty acids having 8 to 18 carbon atoms, and insecticides containing hydrogen ion concentration degradable polymer compounds and emulsifiers as wall materials. A microcapsule composition, a method for preparing the same, and a cockroach attractant containing the composition. The composition according to the present invention, the wall material is decomposed in accordance with the environmental changes of the hydrogen ion concentration in the digestive tract of the cockroach to extend the toxic expression time of the insecticide to express the chain insect effect by the vomiting and re-ingestion of the wheel, By masking the inherent smell, it eliminates the repellency of the cockroach insecticide, increases the attractiveness, and provides the advantage of improving the stability of the insecticide by preventing changes over time due to oxidation of the insecticide.

Description

Insecticidal microcapsule composition for hydrogen ion concentration cognitive degradable cockroach attractant toxicant and preparation method thereof

The present invention relates to an insecticidal microcapsules composition for cockroach attractant. More specifically, the present invention is a hydrophobic core material of microcapsules containing organophosphorus insecticides or carbamate insecticides and saturated fatty acids having 8 to 18 carbon atoms, and insecticides containing hydrogen ion concentration degradable polymer compounds and emulsifiers as wall materials. A microcapsule composition, a method for preparing the same, and a cockroach attractant containing the composition.

The composition according to the present invention, the wall material is decomposed in accordance with the environmental changes of the hydrogen ion concentration in the digestive tract of the cockroach to extend the toxic expression time of the insecticide to express the chain insect effect by the vomiting and re-ingestion of the wheel, By masking the inherent smell, it eliminates the repellency of the cockroach insecticide, increases the attractiveness, and provides the advantage of improving the stability of the insecticide by preventing changes over time due to oxidation of the insecticide.

In general, cockroaches have a high fertility and fertility, so it is difficult to eradicate them at home or in a restaurant. The most important factors in the reproduction and reproduction of these wheels are moisture, hides, herds, temperatures, and food, and the wheels gather in places that meet these conditions. Induction insecticides that exterminate cockroaches have been widely used because they have a decoy structure at the place where cockroaches are gathered to feed prey with insecticides and then cause a continuous poisoning effect. Therefore, to increase the attractive force for the wheel to eat the lure poisoning agent in the lure structure, delay the drug expression time for continuous poisoning action, and to give the drug stability to enable long-term use of insecticidal insecticides for cockroaches It is a very important factor in maintaining and raising the level.

The existing cockroach attractant is manufactured by mixing a common insecticide with excipients irrespective of the physiological characteristics of the target insect, it is inevitable that the insecticide properties are determined by the insecticide properties rather than obtaining the desired insecticide. Representative insecticides for cockroach antagonists include organophosphorus insecticides (chlorpyrphos, maracion, phenytrothion, triclophone, diazinon), carbamate insecticides (propoxyl), hydramcinolone, etc. Phosphorus insecticides and carbamate insecticides are cheaper to produce, but have strong inherent odors, which cause cockroach repellency. They are fast-acting neurotoxins that antagonize acetylcholine esterase during neurotransmission. Because it is characterized in that the fatality within 30 minutes after feeding, the chain insects due to the habit of eating wheels divided by several individuals after vomiting food can not be expected.

Hydramethinone, on the other hand, inhibits cytochrome P-450 in the process of energy metabolism, which kills the wheel by killing the energy metabolism. Although it is a drug that can obtain a chain insecticidal effect on wheel habits during this period, there are disadvantages of high production cost and ineffectiveness when the ambient temperature is below 16 ° C and recovery of dying individuals [J. of Economic Entomology] , vol. 79, 1613-1616, 1986.

Therefore, the present inventors conducted intensive research to develop a method for adjusting the toxic expression rate of insecticides using the physiological characteristics of cockroaches. Cockroaches are digestive organs composed of progut, midgut, and postgut. The battlefield is responsible for storing the foods consumed, the middle bowel is responsible for digestion and absorption of foods, and the rear bowel is responsible for reabsorption of nutrients, water and inorganic salts. 6.0, thick intestine, characterized by pH 8.0 [House, HL in The Physiology of Insecta vol. 5, 1974]. Therefore, the present inventors manufacture a microcapsule formulation having a structure as defined below by using a substance having a different degree of decomposition as a wall material of the microcapsules according to each hydrogen ion concentration environment, and the microcapsule is the overall length of the wheel. And it was stable under acidic and neutral conditions of medium and long term, and decomposed at pH 8.0, which is the hydrogen ion concentration of the long intestine, and showed a continuous chain insecticidal effect.

Accordingly, the present invention is an insecticidal microcapsule comprising an organophosphorus or carbamate insecticide and a hydrophobic core material containing a saturated fatty acid having 8 to 18 carbon atoms, a wall material containing a hydrogen ion concentration degradable polymer compound, and an emulsifier. To a composition.

In the insecticidal microcapsule composition according to the present invention, the type of organophosphorus insecticide or carbamate insecticide used as the insecticidal component is not particularly limited, but preferably chlorpyriphos, marachione, diazinone, penny Organophosphorus insecticides selected from trochion and triclopon or propoxles, which are representative carbamate insecticides, can be used. In the present invention, two or more components of these pesticidal compounds may be mixed and used.

The saturated fatty acid having 8 to 18 carbon atoms used as the core material of the microcapsules in the composition of the present invention includes, for example, caprylic acid (C ₇ H ₁₅ COOH), capric acid (C ₉ H ₁₉ COOH), and lauric acid ( C ₁₁ H ₂₃ COOH), myristic acid (C ₁₃ H ₂₇ COOH), palmitic acid (C ₁₅ H ₃₁ COOH), stearic acid (C ₁₇ H ₃₅ COOH), and the like. Mittic acid or stearic acid is used.

The hydrogen ion concentration-degradable polymer compound used as wall material in the microcapsule composition of the present invention is stable and alkaline under acidic or neutral conditions of the full length and medium length of the wheel as described in the present invention. In 8.0, any polymer compound that satisfies the decomposition conditions may be used. Preferably, a polyacrylic acid / acrylic acid copolymer, cellulose acetate phthalate, and hydroxyethyl ethylcellulose are used. At least one polymer compound selected from the group consisting of hydroxyethyl ethylcellulose phthalate and hydroxypropyl methylcellulose phthalate is used as the wall material. Especially preferably, cellulose acetate phthalate can be used as a wall material.

Emulsifiers are also added to the insecticidal microcapsule compositions of the present invention, and emulsifiers which may be preferably used in the present invention include polyoxyethylene sorbitan-fatty acid ester-based emulsifiers such as Tween 20 (polyoxyethylene (20) Sorbitan monolaurate), Tween 40 (polyoxyethylene (20) sorbitan monopalmitate), Tween 60 (polyoxyethylene (20) sorbitan monostearate), Tween 80 (polyoxyethylene (20) sorbitan Monooleate) and the like, particularly preferably Tween 20.

In the insecticidal microcapsule composition for cockroach attractant insecticide according to the present invention, each component is 5 to 50 parts by weight of organophosphorus or carbamate insecticide, 10 to 50 parts by weight of saturated fatty acid having 8 to 18 carbon atoms, and hydrogen ion concentration. 30 to 50 parts by weight of the high molecular compound and 5 to 20 parts by weight of the emulsifier.

The present invention also relates to a method for producing a microcapsule for cockroach attractant from the composition having the configuration as described above.

According to the method of the present invention for preparing a microcapsule for cockroach attractant vulgaris, a hydrophobic core material of the microcapsule is prepared by melting a saturated fatty acid having 8 to 18 carbon atoms above the melting point and dissolving the organophosphorus or carbamate insecticide therein. Prepared by dissolving the hydrogen ion concentration degradable polymer compound and emulsifier, which is a wall material, in an aqueous solution adjusted to the pH of the alkali range by the alkaline component, and the hydrophobic core material obtained above was added thereto, followed by vigorous stirring to prepare an O / W emulsion. The desired microcapsules can be prepared by forming the powder and drying the emulsion by a spray drying method.

Referring to the method of the present invention as described above in detail as follows.

The manufacturing method according to the present invention can be largely divided into five steps. That is, the method of the present invention is the step of adjusting the pH of the aqueous solution to dissolve the wall material with the alkaline component in the first step to the alkaline range, the second step of dissolving the wall material and emulsifier in the aqueous solution produced in the first step In the third step, the fatty acid is melted above the melting point and the pesticide is dissolved therein. In the fourth step, the hydrophobic solution in which the pesticide is dissolved in the liquid fatty acid produced in the third step is emulsified in the solution produced in the second step. And dispersing, and spray drying the emulsion produced in the fifth step. The order of each of these steps can be arbitrarily changed as required.

As the alkaline component for adjusting the hydrogen ion concentration of the aqueous solution to dissolve the wall material in the first step is preferably ammonia or sodium hydroxide, etc., pH control of the aqueous solution by these alkaline components is a pesticidal active ingredient In order to prevent decomposition | disassembly by this strong alkali, it is preferable to set it as pH 8.0-9.5.

When the microcapsule composition of the insecticidal microcapsules of the present invention by the spray drying method as described above, it takes advantage of the serial insecticidal effect by the slow release, and additionally prevents cockroach repellency due to the unique smell of the insecticide to attract attractive effects Increasing and taking advantage of the temperature-independent insecticidal effect of organophosphorus and carbamate insecticides.

In the case where the microcapsules prepared according to the invention are actually used for the purpose of combating wheels, they are the components commonly used in cockroach attractants, such as plant foods, animal foods, binders, sugars, glycerin It can be used by the conventional method by combining with the same to prepare a cockroach attractant. Therefore, the present invention includes such cockroach attractant.

The content of the insecticidal microcapsule composition in the cockroach attractant is preferably selected to suit the content defined in the Ministry of Health and Welfare for each pesticidal active ingredient included in the composition. For example, the mixing ratio of the microcapsule agent is calculated as an insecticidal active ingredient per 100 parts by weight of the detoxifying agent, and 0.5 to 1.5 parts by weight for chlorpyriphos, an organophosphorus insecticide, 0.5 parts by weight or less for marathione, Phenytrothion is preferably 2.0 parts by weight or less, and carbamate-based insecticide propoxyl is preferably mixed in a ratio of 2.0 parts by weight or less.

The present invention is described in more detail based on the following examples, but the technical scope of the present invention is not limited in any way by these examples.

Example 1

A core material was prepared by melting 25 parts by weight of myristic acid based on the total weight of the microcapsules (100 parts by weight), and then adding 15 parts by weight of propoxal to the dissolved myristic acid. 50 parts by weight of cellulose acetate phthalate and 10 parts by weight of Tween-20 were dissolved, and the core material obtained above was added to 300 ml of an aqueous solution in which pH was adjusted to 8.0 by adding ammonia, followed by vigorous stirring and emulsification. Microcapsules containing a foxesle were prepared.

13.3 parts by weight of microcapsules containing 15% by weight of propoxol, 45 parts by weight of vegetable food (barley powder, yeast extract) and animal food (anchovy powder, sodium casein sodium) and 27.5 parts by weight of sugar source (starch syrup), binder As a mixture, polyethylene glycol 6000 (trade name: Carbowax, Korea Polyol) and 10 parts by weight of glycerin 6 parts by weight of the cockroach attractant was prepared.

Example 2

The core material was prepared by melting 25 parts by weight of palmitic acid based on the total weight of the microcapsules (100 parts by weight), and then adding 15 parts by weight of propoxal to the dissolved palmitic acid. 50 parts by weight of cellulose acetate phthalate and 10 parts by weight of Tween-20 were dissolved, and the core material obtained above was added to 300 ml of an aqueous solution in which pH was adjusted to 8.0 by adding ammonia, followed by vigorous stirring and emulsification. Microcapsules containing a foxesle were prepared.

13.3 parts by weight of microcapsules containing 15% by weight of propoxol, 45 parts by weight of vegetable food (barley powder, yeast extract) and animal food (anchovy powder, sodium casein sodium) and 27.5 parts by weight of sugar source (starch syrup), binder As a mixture, polyethylene glycol 6000 (trade name: Carbowax, Korea Polyol) and 10 parts by weight of glycerin 6 parts by weight of the cockroach attractant was prepared.

Example 3

A core material was prepared by melting 25 parts by weight of stearic acid based on the total weight of the microcapsules (100 parts by weight), and then adding 15 parts by weight of propoxal to the dissolved stearic acid. 50 parts by weight of cellulose acetate phthalate and 10 parts by weight of Tween-20 were dissolved, and the core material obtained above was added to 300 ml of an aqueous solution in which pH was adjusted to 8.0 by adding ammonia, followed by vigorous stirring and emulsification. Microcapsules containing a foxesle were prepared.

13.3 parts by weight of microcapsules containing 15% by weight of propoxol, 45 parts by weight of vegetable food (barley powder, yeast extract) and animal food (anchovy powder, sodium casein sodium) and 27.5 parts by weight of sugar source (starch syrup), binder As a mixture, polyethylene glycol 6000 (trade name: Carbowax, Korea Polyol) and 10 parts by weight of glycerin 6 parts by weight of the cockroach attractant was prepared.

Example 4

A core material was prepared by melting 25 parts by weight of myristic acid based on the total weight of the microcapsules (100 parts by weight), and then adding 15 parts by weight of chlorpyriphos to the dissolved myristic acid. 50 parts by weight of cellulose acetate phthalate and 10 parts by weight of Tween-20 were dissolved, and the core material obtained above was added to 300 ml of an aqueous solution in which pH was adjusted to 8.0 by adding ammonia, followed by vigorous stirring and emulsification. Microcapsules containing pyriphos were prepared.

4.0 parts by weight of microcapsules containing chlorpyrufos at a concentration of 15% by weight, 50 parts by weight of vegetable food (barley flour, yeast extract) and animal food (anchovy powder, sodium casein) and 30 parts by weight of sugar source (starch syrup), A cockroach attractant was prepared by mixing 10 parts by weight of polyethylene glycol 6000 (trade name: Carbowax, Korean Polyol) and 6 parts by weight of glycerin as a binder.

Example 5

The core material was prepared by melting 25 parts by weight of palmitic acid based on the total weight of the microcapsules (100 parts by weight), and then adding 15 parts by weight of chlorpyriphos to the dissolved palmitic acid. 50 parts by weight of cellulose acetate phthalate and 10 parts by weight of Tween-20 were dissolved, and the core material obtained above was added to 300 ml of an aqueous solution in which pH was adjusted to 8.0 by adding ammonia, followed by vigorous stirring and emulsification. Microcapsules containing pyriphos were prepared.

4.0 parts by weight of microcapsules containing chlorpyrufos at a concentration of 15% by weight, 50 parts by weight of vegetable food (barley flour, yeast extract) and animal food (anchovy powder, sodium casein) and 30 parts by weight of sugar source (starch syrup), A cockroach attractant was prepared by mixing 10 parts by weight of polyethylene glycol 6000 (trade name: Carbowax, Korean Polyol) and 6 parts by weight of glycerin as a binder.

Example 6

A core material was prepared by melting 25 parts by weight of stearic acid based on the total weight of the microcapsules (100 parts by weight), and then adding 15 parts by weight of chlorpyriphos to the dissolved stearic acid. 50 parts by weight of cellulose acetate phthalate and 10 parts by weight of Tween-20 were dissolved, and the core material obtained above was added to 300 ml of an aqueous solution in which pH was adjusted to 8.0 by adding ammonia, followed by vigorous stirring and emulsification. Microcapsules containing pyriphos were prepared.

4.0 parts by weight of microcapsules containing chlorpyrufos at a concentration of 15% by weight, 50 parts by weight of vegetable food (barley flour, yeast extract) and animal food (anchovy powder, sodium casein) and 30 parts by weight of sugar source (starch syrup), A cockroach attractant was prepared by mixing 10 parts by weight of polyethylene glycol 6000 (trade name: Carbowax, Korean Polyol) and 6 parts by weight of glycerin as a binder.

Example 7

The core material was prepared by melting 25 parts by weight of myristic acid based on the total weight of the microcapsules (100 parts by weight), and then adding 15 parts by weight of phenytrothion to the dissolved myristic acid. 50 parts by weight of cellulose acetate phthalate and 10 parts by weight of Tween-20 were dissolved, and the core material obtained above was added to 300 ml of an aqueous solution in which pH was adjusted to 8.0 by adding ammonia, followed by strong stirring and emulsification. Microcapsules containing trochion were prepared.

13.3 parts by weight of microcapsules containing phenytrothion at a concentration of 15% by weight, 45 parts by weight of vegetable food (barley flour, yeast extract) and animal food (anchovy powder, sodium casein sodium) and 27.5 parts by weight of sugar source (starch syrup), A cockroach attractant was prepared by mixing 10 parts by weight of polyethylene glycol 6000 (trade name: Carbowax, Korean Polyol) and 6 parts by weight of glycerin as a binder.

Example 8

The core material was prepared by melting 25 parts by weight of palmitic acid based on the total weight of the microcapsules (100 parts by weight), and then adding 15 parts by weight of phenytrothion to the dissolved palmitic acid. 50 parts by weight of cellulose acetate phthalate and 10 parts by weight of Tween-20 were dissolved, and the core material obtained above was added to 300 ml of an aqueous solution in which pH was adjusted to 8.0 by adding ammonia, followed by strong stirring and emulsification. Microcapsules containing trochion were prepared.

13.3 parts by weight of microcapsules containing phenytrothion at a concentration of 15% by weight, 45 parts by weight of vegetable food (barley flour, yeast extract) and animal food (anchovy powder, sodium casein sodium) and 27.5 parts by weight of sugar source (starch syrup), A cockroach attractant was prepared by mixing 10 parts by weight of polyethylene glycol 6000 (trade name: Carbowax, Korean Polyol) and 6 parts by weight of glycerin as a binder.

Example 9

A core material was prepared by melting 25 parts by weight of stearic acid based on the total weight of the microcapsules (100 parts by weight), and then adding 15 parts by weight of phenytrothion to the dissolved stearic acid. 50 parts by weight of cellulose acetate phthalate and 10 parts by weight of Tween-20 were dissolved, and the core material obtained above was added to 300 ml of an aqueous solution in which pH was adjusted to 8.0 by adding ammonia, followed by strong stirring and emulsification. Microcapsules containing trochion were prepared.

13.3 parts by weight of microcapsules containing phenytrothion at a concentration of 15% by weight, 45 parts by weight of vegetable food (barley flour, yeast extract) and animal food (anchovy powder, sodium casein sodium) and 27.5 parts by weight of sugar source (starch syrup), A cockroach attractant was prepared by mixing 10 parts by weight of polyethylene glycol 6000 (trade name: Carbowax, Korean Polyol) and 6 parts by weight of glycerin as a binder.

Comparative Example 1

2 parts by weight of propoxol raw material (99%), 50 parts by weight of vegetable food (barley powder, yeast extract) and animal food (anchovy powder, sodium casein) and 32 parts by weight of sugar source (starch syrup), binder polyethylene glycol 6000 ( Carbowax, Korea polyol) and 10 parts by weight of glycerol was mixed with 6 parts by weight to prepare a detoxifying agent.

Comparative Example 2

0.6 parts by weight of chlorpyrefoss raw material (99%), 50 parts by weight of vegetable food (barley flour, yeast extract) and animal food (anchovy powder, sodium casein) and 31.4 parts by weight of sugar source (starch syrup), binder polyethylene glycol 6000 ( : Carbowax, Korea polyol) 10 parts by weight and glycerin was mixed with 6 parts by weight to prepare a detoxifying agent.

Comparative Example 3

2 parts by weight of phenytrothion raw material (99%), 50 parts by weight of vegetable food (barley powder, yeast extract) and animal food (anchovy powder, sodium casein) and 32 parts by weight of sugar source (starch syrup), binder polyethylene glycol 6000 ( : Carbowax, Korea polyol) 10 parts by weight and glycerin was mixed with 6 parts by weight to prepare a detoxifying agent.

Comparative Example 4

2 parts by weight of raw hydramethinone (99%), 50 parts by weight of vegetable food (barley powder, yeast extract) and animal food (anchovy powder, sodium casein), 32 parts by weight of sugar source (starch syrup), binder polyethylene glycol 6000 ( : Carbowax, Korea polyol) 10 parts by weight and glycerin was mixed with 6 parts by weight to prepare a detoxifying agent.

Experimental Example 1 (evaluation of insecticidal effect and serial insecticidal effect)

Into a 15-liter clear petri dish, the microcapsule-containing wheel guiding agent prepared according to Examples 1 to 9 and the pesticide-containing guiding agent prepared according to Comparative Examples 1 to 4 were added in amounts of 1.5 g each. Petri dishes were provided with water, food, and shelter suitable for the wheels, and 20 adult males of Blatella germanica were added to each other and maintained for 5 days. Subsequently, the insects were removed and 20 adult males of the German wheels that did not come into contact with them were put into each petri dish to evaluate the chain insecticidal effect for 5 days (temperature condition 25 ℃ / 16 ℃, relative humidity 80). %). The measured results are shown in the following Tables 1 to 3, respectively, according to the type of pesticide.

TABLE 1

Comparison of Pesticide Effects of Hydrogen Ion Degradable Microencapsulated Propoxide and Propox Agent Induced Toxins

In Table 1, KT50 is the time taken to kill 50% of the number of treated objects. From the results shown in Table 1 above, the attractant of Examples 1 to 3 containing the microencapsulated propoxol was similar to the attractant of Comparative Example 1 containing the propoxal agent, but with an increase in KT50. Due to the chain mortality is significantly increased, it can be seen that there is no temperature dependence compared to the attractant toxic agent of Comparative Example 4 containing hydramethanone can exhibit a high insecticidal effect.

TABLE 2

Comparison of Insecticidal Effects of Hydrogen Ion Degradable Microencapsulated Chlorpyriphos and Chlorpyriphos Raw Agents

In Table 2, KT50 is the time taken to kill 50% of the number of treated objects. From the results shown in Table 2, the detoxifying agents of Examples 4 to 6 containing the microencapsulated chlorpyrifos had similar insecticidal effects as compared to the attracting agents of Comparative Example 2 containing the chlorpyrifoss original agent, Due to the increase in the chain mortality is remarkably increased, it can be seen that there is no temperature dependence compared to the formulation of Comparative Example 4 containing hydramethanone has a high insecticidal effect.

TABLE 3

Comparison of Insecticidal Effects of Hydrogen Ion Concentration Degradable Microencapsulated Phenytrothion and Phenytrothion Agents

In Table 3, KT50 is the time taken to kill 50% of the number of treated objects. From the results shown in Table 3, the detoxifying agents of Examples 7 to 9 containing microencapsulated phenytrothion were similar to the attracting agents of Comparative Example 3 containing the phenytrothion agent, but increased KT50. Due to the chain mortality is significantly increased, it can be seen that there is no temperature dependence compared with the attractant poisoning agent of Comparative Example 4 containing the hydramethanone has a high insecticidal effect.

2 on the experiment (attraction evaluation)

Into a 100-liter transparent plastic box, the microcapsule-containing stinging agent prepared according to Example 1 and the pesticide-containing stinging agent prepared according to Comparative Example 1 and Comparative Example 4 were simultaneously added in an amount of 1.5 g each. Fifty male adult males were fed, and water, food, and shelter were provided in the center, and 48 hours later, the number of attracted individuals was evaluated by capturing. The measured results are shown in Table 4 below.

TABLE 4

Comparison of Attraction Forces of Induced Toxin Containing Pesticides with Hydrogen Ion Concentration Degradable Microencapsulated Proloxol

The attractant of Example 1 containing the microencapsulated propoxol preparation from Table 4 has significantly increased the attraction force compared to the attractant containing the propoxal agent of Comparative Example 1, the comparison containing hydramethanone Compared to the attractant poisoning agent of Example 4, the attracting force is increased, and the specific smell of the insecticide is masked, indicating that the repelling effect is improved.

Experimental Example 3 (Pesticide Stability Evaluation)

Initial insecticide content was analyzed by HPLC after leaving the detoxifying agents prepared in Examples 1 to 9 and Comparative Examples 1 to 4 at room temperature (25 ° C / relative humidity 80%) for 3, 6, and 9 months. The degradation rate was evaluated to evaluate the stability of the pesticides over time. The measured results are shown in Table 5 below.

TABLE 5

Comparison of pesticide degradation rate (%) according to the change over time

From the results described in Table 5, the detoxifying agents of Examples 1 to 9 containing microencapsulated insecticides had a lower rate of degradation of insecticides over time compared to the detoxifying agents of Comparative Examples 1 to 4 containing insecticides. It can be seen that the pesticidal components are stably maintained during the process.

Claims (10)

Insecticidal microcapsule composition comprising an organophosphorus insecticide or a carbamate insecticide and a hydrophobic core material containing a saturated fatty acid having 8 to 18 carbon atoms, a wall material containing a hydrogen ion concentration degradable polymer compound, and an emulsifier . 2. The insecticidal microcapsule composition according to claim 1, wherein the organophosphorus insecticide is chlorpyriphos, marathion, diazinone, phenytrothion or triclopon. The insecticidal microcapsule composition according to claim 1, wherein the carbamate insecticide is propoxyl. The insecticidal microcapsule composition according to claim 1, wherein the saturated fatty acid having 8 to 18 carbon atoms as the core material is myristic acid, palmitic acid or stearic acid. The at least one component according to claim 1, wherein the hydrolyzable polymer compound, which is a wall material, is selected from the group consisting of a copolymer of polyacrylic acid and acrylic acid, cellulose acetate phthalate, hydroxyethyl ethylcellulose phthalate and hydroxypropyl ethylcellulose phthalate. Insecticidal microcapsules composition characterized in that. The polyoxyethylene (20) sorbitan monolaurate, polyoxyethylene (20) sorbitan monopalmitate, polyoxyethylene (20) sorbitan monolaurate, polyoxyethylene (20) as an emulsifier. A pesticidal microcapsule composition, characterized in that it is used at least one component selected from the group consisting of sorbitan monostearate and polyoxyethylene (20) sorbitan monooleate. According to claim 1, wherein the ratio of 5 to 50 parts by weight of organophosphorus or carbamate insecticide, 10 to 50 parts by weight of saturated fatty acid, 30 to 50 parts by weight of hydrogen ion concentration degradable polymer compound as a wall material and 5 to 20 parts by weight of emulsifier Insecticidal microcapsule composition, characterized in that configured. A cockroach attractant comprising a plant and animal feed, a sugar source, a binder and a glycerin composition comprising an insecticidal microcapsule composition according to claim 1. A hydrophobic core material of microcapsules was prepared by melting saturated fatty acids having 8 to 18 carbon atoms above the melting point and dissolving the organophosphorus or carbamate insecticides therein, and adjusting the pH to an alkaline range by alkaline components. Dissolve the hydrolyzable polymer compound and emulsifier, which are hydrogen ion concentration, as a material, and then, add the hydrophobic core material obtained above and stir vigorously to form an O / W emulsion. The emulsion is sprayed by spray drying. Method for producing a pesticidal microcapsules for cockroach attractant, characterized in that the drying. 10. The method of claim 9, wherein the pH is adjusted to 8.0 to 9.5 with ammonia or sodium hydroxide.