JPS59225904A - Insecticidal method of wood - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention The present invention uses 2,3-dihydro, 2,2-dimethyl-7-benzo(b)furanyl N-dibutylaminothio-N-methylcarbamate (common name: dicarbosulfan) as an active ingredient. This invention relates to a method for preventing insects in wood, which comprises treating wood or soil with a chemical containing a chemical.

In recent years, a large amount of wood has been imported for use as building materials for houses and structures, furniture, plywood for furniture, and general industrial materials, but the damage caused by wood pests to these softwood materials has been rapidly increasing. Furthermore, the damage caused by wood pests to wooden buildings is extremely serious. The pests that damage these timbers include termites.

Pygmy beetles, yellow beetles, silver beetles, and white beetles are well known, and chemicals such as 13HC, DDT, and chlordane have been used to control these pests, but today most of these are toxic to the human body. Currently, their manufacture is prohibited or their use is restricted for these reasons. Currently, chlordane is heavily used as a drug suitable for controlling wood pests, and its practical effects have been confirmed, but there is a strong need to develop a drug that exhibits stable effects over a longer period of time and to establish an effective control method. It is rare.

As a result of repeated research for this purpose, the present inventors published a publication in Japanese Patent Publication No. 53-39487 on a well-known method that is effective against crop pests such as Mexican bean piltle, southern butterfly beetle, pea aphid, and two-spotted mites. It was discovered that the compound carbosulfan has a more stable effect over a long period of time than chlordane against wood pests such as whiteworms and wood beetles, and the control method of the present invention was established.

In general, some pesticides and other insecticides show insecticidal activity against wood pests such as termites and wood beetles, but in order to protect wood, it is necessary to maintain the effect for a very long time with a single treatment. However, carbamate insecticides, which are used as agricultural chemicals, have little sustained effect against wood pests, so they are rarely put to practical use.

To use carbosulfan in the present invention, carbosulfan is mixed with a carrier or diluent according to a conventional method, and if necessary, desired auxiliary agents 2, such as surfactants 9, dispersants, fixing agents, etc. are added, Convenient dosage form 3: For example, emulsion, oil 2
It may be prepared into granules, wettable powders, etc.

The present invention is applied to the soil surface or into the soil around wood or structures to be protected from attack by termites, wood beetles, etc. The present invention also includes embodiments in which the present invention is applied to wooden objects such as trees, wooden fences, wooden shelves, stakes, railroad ties, etc.; and to the soil surrounding buildings such as shrines and temples, houses, barns, and factories.

In the treatment method of the present invention, the active ingredient may be applied or sprayed onto the wood surface in an amount of 0.1 to 10 g per 1 d and a treatment amount of 200 to 300 ml.

It is also possible to process by immersing it in a diluted solution.

When spraying on the surface or mixing with the soil around a structure,
Active ingredient Toshiko 1n? It suffices to process in the range of 10 to 250 g per serving9 For example, in the case of a diluted solution, 1rI? A predetermined amount of diluted solution of 5 to 10β may be sprayed on the surface of the soil or mixed into the soil.

Prescription examples and test examples of the present invention are shown below, but the present invention is not limited thereto. In the prescription examples, 1 part indicates parts by weight.

Prescription example 1゜carbosulfan 25
xylene 4
0 parts cyclohexanone
20 parts mixture of polyoxyethylene nonylphenyl ether and alkylbenzene sulfonic acid 15
10 parts or more are uniformly mixed and dissolved to form an emulsion.

Formulation Example 2゜Emulsion of Formulation Example 1
2 parts kerosene
At least 98 parts are uniformly mixed and dissolved to form an oil agent.

Formulation example 3 Emulsion of Example 1 2
0 parts pumice grains
The emulsion of Example 1 was sprayed onto 80 parts of pumice to form granules.

Test example 1. Anticide and Weather Resistance Effect Test 1 ml of an emulsion drug solution diluted to a predetermined concentration of carbosulfan was absorbed into a filter paper with a diameter of 9 cm (and dried indoors. The filter paper treated with weathering treatment and the filter paper without treatment were placed in a petri dish.

1.5+nl of water was added, and the termites were released from the side of the first section, and the number of dead insects (K) and the number of dead insects (D) were measured over time.

[Weatherproofing treatment]

The filter paper is immersed in still water for 10 seconds and then placed in a ventilation dryer at 40° C. for 2 hours to dry. Repeat this operation three times.

The results are shown in Table 1.

Table 1 Test Example 2. Indoor test using wood chips The test method is based on the Japanese Termite Countermeasures Association's Termite Efficacy Test Method - Comprehensive Test.

Test specimen: 2 cm cubic red pine sapwood Chemical treatment: After drying the test specimen at 60°C for 24 hours,
Immerse it for 0 seconds, pull it out, remove the excess chemical solution with a filter paper, and then dry it indoors.

Weathering operation: Perform this on half of the test specimens approximately one month after the chemical treatment. In a room at about 26'C, in still water at room temperature.
The sample was immersed for 0 seconds, left in a closed container with water at the bottom for 4 hours, and dried at 40°C ± 2°C for 20 hours. Repeat this operation 10 times.

Release: One test specimen was placed in a rearing container (a plastic cylinder with a diameter of 8 cm and a height of 5 cm, the bottom of which was hardened with plaster of 5 cm thick), and 11,88,150 domestic termites and 15 soldier ants were placed there. This is placed in a lidded container lined with wet cotton and left at 26°C for 21 days.

Investigation: The mortality rate after 3 weeks was investigated for each container and the average mortality rate was calculated. After 3 weeks, the degree of feeding damage to the wood chips was observed and a standard was calculated based on the following 4-level judgment.

-No feeding damage 10. Slight feeding damage 10. Little feeding damage A lot of feeding damage The results are shown in Tables 2 and 3.

Table 2 (Feeding damage test) Test example 3. 2nd instar larvae killing effect test 5 g of powdered artificial feed and 5 ml of a chemical solution of a prescribed concentration were mixed, solidified to have a moisture content of 12 to 15%, and then holes were made in the solid feed. Insert 10 2nd instar larvae of the beetles and press the hole with a sponge. The number of dead insects was investigated after 1 and 2 weeks.

The results are shown in Table 4.

Table 4 BPMC*'2-Secondary-butylphenyl-N-methylcarbamate.

Claims (1)

[Claims] +112.3-Dihydro-2,2-dimethyl-7-benzo(b)furanyl N-dibutylaminothio-N-methyl carbamate is treated as an active ingredient in wood or soil. A method for preventing insects from wood. (2) Is the treatment method In? 2. The insect repellent method according to claim 1, wherein the insect repellent method comprises applying or spraying a drug in an amount of 0.1 g to 10 g as an active ingredient. (3) Claim 1, characterized in that the treatment method involves spraying on the soil surface or mixing with the soil in the range of 10g to 2.50g of the active ingredient per rrr of soil surface.
Insect control method described in section.