JPH0525841B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a cockroach repellent characterized by containing microcapsules of boric acid and an organic phosphorus agent or a cyclodextrin clathrate compound. Conventional methods for exterminating cockroaches include spraying and applying insecticides, using repellents,
Methods using attractants and traps are known. Although the application of insecticides is a proactive method, it is not always satisfactory in terms of usage and residual effectiveness.The latter method is not effective in preventing the emergence and proliferation of cockroaches, and Only some of the cockroaches inside can be exterminated. Also, recently,
Another method is to mix boric acid with various foods that cockroaches like, such as flour, rice bran, and potatoes, and place it in areas where cockroaches roam and use it as poison bait. The effect is extremely slow, making it difficult for general consumers who prefer quick-acting effects to accept it. On the other hand, fast-acting, low-toxicity organophosphorus agents are also used as active ingredients in bait agents, but the active ingredients tend to decompose over time when mixed with feeding substances and substrates, and their effectiveness does not last long. have. The inventors of the present invention have conducted intensive research to find a more useful cockroach repellent that can compensate for the slow-acting drawback of boric acid repellents. The present invention has been completed by discovering that a method of mixing an organic phosphorus agent is suitable for the present purpose, is fast-acting, and exhibits an excellent extermination effect over a long period of time. That is, when an organic phosphorus agent is used alone, it is decomposed by contact with boric acid, but by microencapsulation or cyclodextrin inclusion, decomposition over time is significantly suppressed, and mixing of the two becomes possible. Also, boric acid and organic phosphorus agents
Although it is generally known that the composition of the present invention does not have hatching prevention activity against adult cockroaches, it is surprising that the composition of the present invention not only combines the quick-acting properties of an organic phosphorus agent with the effectiveness of boric acid. In addition, it was revealed that it also has an effect on preventing adult cockroaches from hatching. Therefore, the composition of the present invention exhibits exterminating effects on all stages of cockroach larvae and adults, and is an extremely efficient and highly practical exterminating agent from the standpoint of comprehensive control. Examples of the boric acid used in the present invention include, in addition to spirally slippery boric acid, for example, kaioborite (CaNaB ₅ O ₉ 8H ₂ O) containing calcium components, kaioborite (Ca ₂ B ₆ O ₁₁・5H ₂ O), priceite (Ca ₅ B ₁₂ O ₂₃・9H ₂ O), hydroborasite (MgCaB ₆ O ₁₁・6H ₂ O) and other finely powdered natural raw materials and various boric acid compounds are also included. Although much remains unclear about the insecticidal mechanism of boric acid against cockroaches, one theory is that ingestion of boric acid induces a state of drought and stops the digestive function. On the other hand, the organic phosphorus agent may be used alone or as a mixture of two or more, and the type thereof is not particularly limited, but preferred examples include fenitrothion, dipterex, diazinon, etc., which have low toxicity. In addition, no special technology is required for microencapsulation of organic phosphorus agents or cyclodextrin inclusion.
Various formulations such as powder, paste, emulsion or liquid can be made using conventional techniques and processes. The cockroach repellent of the present invention contains 5 boric acids.
~80% by weight, or 1~70% by weight of microencapsulated or cyclodextrin-encapsulated organic phosphorus agents, and if necessary, flour, potatoes, Foods such as onions, butter, fish meal, sugar,
Alternatively, attractants, excipients, water, etc. are added as appropriate, and the mixture is molded into any desired dosage form such as tablets, granules, powder, and paste. The composition of the present invention may also contain other insecticides, such as allethrin, phthalthrin,
Pyrethroids such as flamethrin, phenothrin, permethrin, and resmethrin, NAC,
By appropriately mixing carbamates such as MTMC and BPMC, juvenile hormone-like compounds such as hydroprene, chitin synthesis inhibitors, synergists, and fragrances, highly effective multipurpose compositions can be created. This can be expected to save labor. The pesticidal agent of the present invention obtained in this way is easy to use, and if it is placed in a place where cockroaches are found in the home, it will remain effective as a poisonous bait for a long time, and the cockroaches that eat it will be able to control both larvae and adults. First, the fast-acting nature of organic phosphorus agents and the slow-acting nature of boric acid will definitely lead to death. Moreover, since it also exerts a hatching prevention effect on the female adult that feeds on it, the hatching rate of the eggs laid by the adult is extremely low, so it has a great advantage in suppressing the population density of cockroaches. Moreover, since the cockroach repellent of the present invention contains two types of components having completely different mechanisms of action against cockroaches, it is also effective in suppressing the development of resistance to insecticides. Next, examples of the present invention will be specifically described, but it goes without saying that the present invention is not limited to these examples. Example 1 60 parts of industrial boric acid, 20 parts of fenitrothion microcapsules (8 parts as fenitrothion),
Knead 10 parts of flour, 5 parts of sugar, and 5 parts of milk to make a dumpling-like mass, then put it in a hot air dryer.
It was dried at 80°C for 2 hours to obtain a dumpling-shaped preparation. Example 2 40 parts of industrial boric acid, 40 parts of diazinon-β cyclodextrin clathrate compound (5 parts as diazinon), 8 parts of crushed onion, 1 part of phenothrin
1 part, 6 parts of starch, a small amount of colored powder, and 5 parts of water were added, mixed well, and compressed using a tablet machine to obtain tablets. Example 3: Finely pulverized kaiborosite to 100 μm or less, 50 parts of the fine powder, 25 diptelex microcapsules
division (10 divisions as dipterex), 15 divisions of rice bran,
10 parts of milk was added, kneaded well, and passed through a granulator to obtain a granular preparation. Test Example 1 In a plastic container approximately 30 cm cubic in size, two dangos (spherical with a diameter of approximately 1 cm) obtained in Example 1 were placed every 1 period after production, and a Chinese cockroach♂♀ was placed in the container. Ten adult insects were released and the number of days elapsed and the total number of dead insects were observed. As controls, the drug was only boric acid (No. 2), the drug was only fenitrothion (No. 3), the drug was only fenitrothion microcapsules (No. 4), and the drug was not used (No. 5). was used. Note that MS stands for cyclocapsule and CD stands for cyclodextrin inclusion compound.

[Table] As a result of the test, the insecticidal agent of the present invention showed fast-acting and high insecticidal efficacy even after a long period of time, such as after 5 or 10 months, and its level was higher than that of boric acid single agent (No. 2). ) and fenitrothion MC single agent (No. 4)
The effect was more synergistic than expected based on their respective efficacy. Test Example 2 In order to examine the hatching prevention effect of the insecticide of the present invention on adult cockroaches, the granules obtained in Example 3 were
Mix with 4 times the amount of drug-free granules to reduce the drug concentration to 1/1.
A sample diluted to 5 was used. Place 1 g each of the above granules in a plastic container of approximately 30 cm cube, and add 5 adult male and female American cockroaches each.
The animals were released one by one. After 5 days, the adult insects were removed from the container, and the hatching rate of the eggs laid during that time was determined as follows.

[Table] The low number of eggs laid in test numbers No. 1 and No. 3 is thought to be due to the fast-acting properties of Diptelecus. The pesticidal agent of the present invention (No. 1) is a boric acid single agent (No.
2) showed a remarkable hatching prevention effect that was not seen with the organic phosphorus agent alone (No. 3), and it was observed that a new effect was imparted by mixing.

Claims (1)

[Claims] 1. A cockroach repellent characterized by containing boric acid and microcapsules of an organic phosphorus agent or a cyclodextrin clathrate compound.