JPS6024761B2 - Composition for pest control - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pest control composition, particularly to a pest control composition suitable for controlling termites and bark beetles that damage wood.

More specifically, the present invention provides termites and termites containing 2,4,6-tribromophenol as a single active ingredient or a mixture of 2,4,6-tribromophenol and known chlordane as an active ingredient. The present invention relates to a pest control composition for bark beetles. Termites and bark beetles are particularly important pests that damage wood after sawing.

Termites prefer to feed on the wood of buildings, especially the parts that are in direct contact with the ground or the parts closest to the ground, and damage foundations, pillars,
It can cause damage to buildings, etc., and in extreme cases, it can even cause the house to collapse. In Japan, the Yamato termite and the Japanese termite are the most commonly known termites, and the damage caused by the Yeshiroa River is especially significant in southwestern Japan. For termite control, in the case of new and existing houses, the wood of the structure,
Treat the entire surface of the subfloor soil and the soil around the concrete foundation with chemicals to prevent termite damage. Furthermore, when an existing house has been damaged, termites are exterminated by drilling or injecting chemicals into the damaged area and surrounding wood. Conventionally, as a preventive and exterminating agent, cypress in Japan has been used. Chlordane agents account for more than 90% of all ant control agents used. The main component of chlordane is chlordane (1,2,4,5,6,7,8,8-octachloro-2,3,$4,7,7a-hexahydro-4,7-methanoindene), and some It is a mixture containing other related substances. The raw material of chlordane is yellowish brown to dark brown, clear viscous liquid, with a peculiar odor, miscible with anhydrous ethanol, ether, acetone, chloroform, carbon disulfide, ethyl acetate, carbon tetrachloride or benzene, but sparingly soluble in water. It is. Chlordane sources are used as oils or emulsions. When chlordane is used as a prophylactic agent, it has been confirmed that a single treatment has an anti-termite effect on more than 29 types of termites, and its toxicity is relatively low, so it is widely used as mentioned above. On the other hand, when chlordane is used for extermination treatment, it has the disadvantage that it is somewhat lacking in fast-acting properties. In other words, when misting is used to exterminate termites, it takes a relatively long time to completely kill the termites. On the other hand, the damage caused by wood beetles, which cause damage to the interior wood of buildings, is becoming more important year by year.

There are four types of wood beetles known in Japan, and among them, the yellow wood beetle and the yellow wood beetle cause significant damage to buildings. The latter is a northern type and is only distributed in Hokkaido in Japan, whereas the former is a southern type and is widely distributed in the tropics, subtropics, and temperate zones. In particular, lauan wood, which is imported as southern wood, is the most suitable for the breeding of oyster beetles, and as the use of lauan wood increases, the damage caused by it is also increasing. In particular, plywood, hardboard, and fiberboard made of lauan wood are particularly susceptible to damage caused by the wood beetle. Similarly to termites, chlordane is widely used for the prevention and extermination of this pest. By mixing chlordane into the adhesive for plywood, hardboard, and fiberboard, the damage caused by the Japanese yellow beetle can be completely prevented. The chlordane-treated plywood produced in this way is protected not only from damage by the Japanese yellow beetle, but also from termites as mentioned above. As described above, chlordane is a very effective drug against both termites and Japanese bark beetles, but as mentioned above, it has the disadvantage that it lacks quick effectiveness when exterminating termites. The inventor screened a large number of organic compounds in order to find a fast-acting drug, especially for exterminating termites, and found that 2,4,6-tribromophenol had excellent fast-acting properties against termites, and It was also found that it has an excellent effect on controlling the Japanese yellow beetle. Also, 2.4
・6-Tripromophenol is advantageous because it is inexpensive and can be supplied in large quantities as an intermediate for the chicken retardant produced by Bergicol. The present invention not only shows an excellent control effect on termites and wood beetles by using tribromophenol as a single agent on wood, but also improves the delayed effect of chlordane on termites by using it in combination with the aforementioned chlordane. It turns out it can be done. In such a mixed use, the tribromophenol of the present invention does not inhibit the residual effectiveness of chlordane.
In addition, chlordane has been used at high concentrations to compensate for its slow-acting properties, but by combining it with tripromophenol of the present invention to provide rapid-acting properties, it is now possible to reduce the concentration of chlordane itself used. became. See Examples 1 and 2 in this regard. Mississippi, USA
Table 1 shows the results of a test on the residual effectiveness of chlordane for termite control, which was conducted at the U.S. Department of Agriculture's Southern Forest Products Experiment Station in Gulf Boat City, and is still ongoing.

Table 1 In this test, pine wood was placed on the ground whose surface had been treated with the amount of sprayed liquid shown in Table 1, and it was observed whether termites would damage the pine wood.

Since the soil treatment was carried out in 1 Myoyo, the soil has been shown to be effective in controlling termites in 28 Oma to the present.

According to this test, only in the test area where 1% chlordane oil was sprayed at 2.55 times per square meter, the defense rate fell below 100 for the first time in the 197th year of the test after the start of the test. On the other hand, in the control test plot where the soil surface was not treated with a chlordane agent, termite damage was significant. In this way, chlordane exhibits extremely long-term residual effectiveness in terms of termite control.

Furthermore, such residual effects have been confirmed even when chlordane agents are used at low concentrations, but as mentioned above, in order to compensate for the delayed effects, drugs are used at slightly higher concentrations than practical concentrations. By using the tribromophenol of the present invention in combination with this chlordane, a mixture was developed that combines the residual effect of chlordane and the immediate effect of tripromophenol, and has an unexpectedly excellent termite control effect. In addition, it was confirmed from Experimental Example 5 that 2,4,6-tribromophenol also exhibits an excellent residual effect, although the residual effect is not as good as that of chlordane. The acute oral toxicity of the chlordane drug substance is relatively low with an LD law value of 57 c/kg for rats, but the acute oral toxicity of the tribromophenol of the present invention is even higher with an o value of 9/k9 of 5000 for rats. Significantly low.

Therefore, when used as a mixture, the concentration of the mixture may be equal to or lower than the concentration normally used for chlordane, so that the acute toxicity of the mixture is significantly reduced. As described above, by using the tribromophenol of the present invention in combination with chlordane, extremely excellent effects can be achieved in terms of improving the effect on termites and reducing acute toxicity.

The single agents according to the invention can be formulated in the customary manner as aqueous solutions, emulsions or oils, and the mixtures with chlordane can likewise be formulated as emulsions or oils.

Aqueous solvents and emulsions are diluted with water as necessary at the time of use. The oil can be used as is. Alternatively, the treatment solution can be prepared by mixing the chlordane emulsion and the aqueous tripromophenol solution immediately before use. The concentration of the agent of the present invention when used is 100 to 20% applied per wood surface area.
It is used at a concentration of 0.1% by weight or more, usually 0.5% by weight or more when used as a single agent, assuming 0 cc/.

Although the upper limit of the concentration is not critical, a concentration exceeding 2.5% by weight is unfavorable from an economic point of view. In addition, in the case of coagulants, 1% by weight or more of chlordane and 0.1% by weight or more of tribromophenol, preferably 0.5% by weight
Can be used at higher concentrations. At the concentration used, the agents of the invention can treat wood by any conventional means, such as dipping, painting and spraying.

Hereinafter, the present invention will be explained in more detail with reference to actual test examples and examples.

Experimental Example 1 Termite insecticidal effect of 2,4,6-tribromophenol Furnace paper was sufficiently immersed in the chemical at the concentration shown in Table 2, taken out, air-dried for a day and night, and placed in a petri dish.

Twenty domestic termites were placed on each petri dish - chemically treated furnace paper, and the termites were observed at each time shown in Table 2. Three trials were conducted for each drug concentration and the average mortality rate was calculated. The results are shown in Table 2. Table 2 As is clear from the results in Table 2, 2.4.6-tribromophenol exhibits superior rapid efficacy compared to chlordane.

Experimental Example 2 Termite insecticidal effect of a mixture of 2.4.6-tribromophenol and chlordane A test was conducted on the mixture in the same manner as in Experimental Example 1, and the results shown in Table 3 were obtained.

Table 3 *2,4,6-tribromophenol**2,
4,6-Tribromophenol sodium salt As is clear from the test results in Table 3, even though the chlordane concentration is 1%, when 0.1% or more of TBP is mixed, Table 2 Even when compared with the case where chlordane shown in 2 is used alone at a concentration of 2%, the immediate effect is clearly improved.

In particular, it can be seen that the effect is remarkable when TBP is blended at a concentration of 0.5%. Experimental Example 3 2.4.6 - Tripromophenol's insecticidal effect on the Japanese white beetle The method of Experimental Example 1 was carried out using the same type of Japanese short termite instead of the Japanese termite, and the average mortality rate over time of the white short termite was determined.

In addition, since it is difficult to raise large quantities of the flat-eared beetle, a commonly used substitute insect, the triumphal beetle (Triumcas nneumher st), was used in the test. The use of Aspergillus japonica for research on the control of the Japanese yellow beetle is described, for example, in Hachiro Mori et al.: Research on determining the control efficacy of wood treated for controlling the Japanese yellow beetle, 1971 Forestry Experimental Research Report Shigeru 9-256. Table 4 shows the average mortality rate over time of the white-breasted butterfly. Table 4 Although the TBP agent of the present invention is not as effective as chlordane in terms of its insecticidal effect against the blackberry, it exhibits a practical level of effect.

Experimental Example 4 Using the same test method as Experiment 3, chlordane and 2, 4, 6
-tribromophere/- was tested.

The results are shown in Table 5. Table 5 A mixture of TBP and chlordane is comparable in effectiveness to chlordane alone shown in Table 4.

Experimental Example 5 Resistance experiment of chemically treated wood against domestic termites Weathering of chemically treated wood (weathering under accelerated conditions: JISA
The method using Spot 02 was applied mutatis mutandis), and then the residual effectiveness in controlling domestic termites was tested.

The test wood was 4 x 4 x 2 pine horn wood and was treated with chemicals as shown in the table. The drug treatment was performed by immersion into the drug for 20 minutes or by pressurized injection (the method of JISA9302 was applied mutatis mutandis). At each drug concentration, a total of 2 chemically treated test materials were prepared for immersion and pressurized injection in 1q groups, and half of each sample was subjected to film resistance operation in 1q groups. This corresponds to approximately 3 years of normal outdoor exposure.
A total of 32 test materials were used in one set of tests, one with each chemical treatment and one without weathering treatment.

The test used two colonies of Japanese termites that had been nested and reared in advance in concrete containers of 1 x 1 skin x 1 desk.

The 32 test materials were randomly divided into two groups, and one trout treatment material of the same size was added to each group, so that 17 test materials were placed in each colony. Each container is filled with sandy soil, and the termite nest is located at the bottom. The test material was placed directly horizontally on the soil surface of each container. The test was repeated five times, and the average value of the amount of damage was calculated.

The relationship between the degree of damage and the amount of damage (%) is as follows.

Although the amount of damage is expressed in %, this does not quantitatively indicate the weight or volume of the actually damaged part, but is a type of index based on the following criteria. Damage Index Table 6 The weather resistance of TBP alone, especially TBP oil, is comparable to that of chlordane oil.

Since the TBP sodium salt aqueous solvent is hydrolyzable, its weather resistance is somewhat low.Example: The composition of the present invention was mixed with the following ingredients and formulated.

All percentages are based on weight. Composition 1 (emulsion) 2,4,6-tribromophenol 40.0% solvent (kerosene 40%, inpropyl alcohol 10%)
50.0 Emulsifier
10.0 Composition 2 (oil agent) 2/4
・6-tribromophenol 1.0% solvent (kerosene) 99.0 composition 3 (aqueous solvent) 2
・4,6-tribromophyl sodium salt (as sodium salt) 37.0% water
63. o Composition 4 (mixed emulsion) 2.
4,6-Tribromophenol -15.0% Chlorgen 30.0 Solvent (kerosene 40%, inpropyl alcohol 10%)
45.0 emulsifier
10.0 Composition 5 (mixed oil) 2.4.
6-tribromophenol 0.5% chlordane
1.0 solvent (kerosene)
Job. 5 The emulsions or aqueous solutions prepared above (compositions 1, 3 and 4) were diluted with water to the desired active ingredient concentration at the time of use.

Claims (1)

[Claims] 1. A pest control composition comprising 2,4,6-tribromophenol or a salt thereof and a carrier. 2. The composition according to claim 1, wherein the pest is a termite. 3 2,4,6-tribromophenol or its salt,
A pest control composition comprising chlordane and a carrier. 4. The composition according to claim 3, wherein the pest is termites.