JPS63174908A - Termite-controlling agent and method for vermin-proofing of wood using said agent - Google Patents

Abstract

PURPOSE:To obtain a termite-controlling agent having synergistically improved insecticidal effect, by combining a molybdenum compound with a tungsten compound both of which are compounds having high safety and available at low cost. CONSTITUTION:The objective termite-controlling agent contains (A) a molybdenum compound (e.g. sodium molybdate, molybdic acid anhydride, etc.) and (B) a tungsten compound (e.g. sodium tungstate, calcium tungstate, etc.) at a mixing ratio of preferably 1:4-4:1. The totals amount of the active components in the agent is 0.01-90wt.%. The insecticidal and insectrepelling effect can be further improved by compounding a termite attractant such as wood decayed with Gyrophara lacrymans, Trametes pallisoti, etc. The agent may be properly compounded with other insecticide (chlorpyrifos, permethrin, carbamate, etc.), synergist (e.g. S-421), preservative, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a termite control agent that targets termites that damage wood.

In recent years, damage caused by pests that feed on wood, such as wood ants, carp beetles, and flat-eared wood beetles, has become a problem.

In order to prevent damage from these pests, materials have traditionally been treated with an appropriate insect repellent, and for this purpose, organic chlorine insecticides such as chlordane and dieldrin have been used as insecticidal and insect repellent ingredients. .

However, all of these insect repellent ingredients have problems in terms of persistence, toxicity, decomposition, environmental pollution, etc., and the development of low-toxicity insect repellents is desired.

By the way, according to the disclosure of Japanese Patent Publication No. 59-82309, it has been proposed that an effectively soluble compound of an element selected from the group consisting of molybdenum and tungsten suppresses animals that circumscribe nitrogen. This discovery is as follows: 1. Molybdenum and tungsten are cheap.

2.It is safer than chromium and other metals.

3. Molybdenum and tungsten are not toxic to pests other than nitrogen-fixing animals such as termites and carp beetles, and are highly selective.

4. It is slow-acting, so it is not repelled by termites etc.

5. Stable in various forms.

Although it is extremely useful as an insect repellent for wood in these respects, there is a problem in that its insecticidal and insect repellent effects are not necessarily sufficient when a molybdenum compound or a tungsten compound is applied alone.

However, as a result of further studying the mixture of molybdenum compounds and tungsten compounds from a practical standpoint, the present inventors found that a remarkable synergistic effect was observed in insecticidal and insect repellent effects, and completed the present invention (published in the publication). Patent Publication 1982-82
No. 309 states that it "contains a compound, preferably a salt, of one or both of molybdenum and tungsten," but there are no examples of mixing the same compounds, and of course, no knowledge regarding the synergistic effect of mixing is disclosed. Not yet. ) Although there are many unknowns about the mechanism of the synergistic effect,
This is thought to be due to the difference in the mechanism of insecticidal action of molybdenum compounds and tungsten compounds against termites.

That is, the tungsten compound is disclosed in Japanese Patent Publication No. 59-8.
As described in No. 2309, the main insecticidal mechanism of molybdenum compounds is that the main insecticidal mechanism of molybdenum compounds is due to the action of inhibiting nitrogen fixation by protozoa that live symbiotically in the intestines of termites. It has been confirmed that the substance accumulates in the termite body, and it is presumed that the same effects combine to synergistically enhance the insecticidal effect. Until now, the insecticidal effects of molybdenum compounds and tungsten compounds against termites have generally been discussed by the same organization, and this discovery that the combined use of the two exhibits a synergistic effect is completely unexpected based on conventional knowledge.

Examples of molybdenum compounds used in the termite control agent of the present invention include sodium molybdate (Na2MoO4
) = molybdic anhydride (MoO3).

Molybdic acid (H2MOO4), ferrous molybdate (FeMoO, ammonium molybdate [(NF2
)2MO207), molybdenum ore, etc.
Molybdenum alone is also included in a broad sense.

On the other hand, as a tungsten compound, sodium tungstate (lfa2WO4)-tungsten acid power yv'
Examples include yum (CaWO4) and tungsten alone, but the material is not limited to these.

The mortar ant control agent of the present invention is characterized by a mixture of one or more compounds selected from the respective groups of molybdenum and tungsten, and the composition and properties of the molybdenum compound and tungsten compound used are not limited.

For example, molybdenum compounds and tungsten compounds are generally used in the form of water-soluble metal salts, but if necessary, they may be converted into insoluble compounds by forming complexes with other inorganic or organic substances. .

Each termite control agent can contain 0.01 to 90% by weight of a molybdenum compound and a tungsten compound as insecticidal and insect repellent ingredients, and the mixing ratio of the molybdenum compound and tungsten compound to have a synergistic effect is 1: 10-10:1
(preferably 1:4 to 4:1) is suitable.

Furthermore, a termite attractant is suitably blended in order to exhibit insecticidal and insect repellent effects more efficiently.

As a termite attractant, for example, rotten material of Physcomitrella sp. It is also possible to add.

Furthermore, the termite control agent of the present invention may include organic phosphorus agents such as cloμ pyrifos, phoxim, and pyridafenthione;
Addition of pyrethroid agents such as betamethrin, fluparinate, fenvalerate, and fenpropathrin, or other insecticides such as tripropisocyanate, carbamates, or synergists such as S-421 and piperoni μbutoxide. In addition, various types of preservatives such as CCA compounds - CCA, CCB, etc. - O-halophenol compounds - bentacroμpheniμlaurate, p-bromo-2,6-dichlorophenol, etc. Dopropyl p-based compound-IB'-1000゜3
- Quaternary ammonium compounds and amine salts such as iodo-2-glovinylbutyl carpamate - Benzalkonium chloride, dialkyp dimethymu ammonium chloride, etc. - Organotin compounds - Bis-(n-tributyltin) oxide, tributyltin A useful multipurpose composition can also be obtained by appropriately mixing tin terephthalate, etc., zinc naphthenate, xyligen aluminum salt, and the like.

A further object of the present invention is to provide the termite control agent of the present invention as a means for controlling wood insects.

Conventional methods such as pressurized injection into wood, coating on wood, or treating the soil under and around houses can be used as a method for applying termite control agents. It is also possible to apply it as a termite prevention coating agent by impregnating it with a bait agent for pest control, or colored paint or varnish.

When used as a bait, cellulose tablets, i.e.
Water, cellulosic materials such as paper, cardboard, wood chips or cotton may be impregnated with the composition of the invention, along with an attractant if necessary.

The present invention's clear ant control agent can be in various forms depending on the properties of the control agent and the purpose of use, such as oil solutions, emulsions, irrigation agents, water solutions, powders, and aerosols. and the tungsten compound are 0.01
~90% by weight is blended.

Both formulations can be prepared according to conventional methods, and solid carriers include clays (kaolin, bentonites, etc.).
Examples include fine powders such as sludge and powders.

Common liquid carriers include water and alcohols.
Other appropriate surfactants, casein, gelatin, starch ff1. cMc, polyvinyl alcohol.

Hereinafter, in order to further clarify the synergistic effect of the present invention, actual test examples will be described, but it goes without saying that the present invention is not limited to these.

Test Example 1 One drop of an aqueous solvent containing sodium molybdate and sodium tungstate at a predetermined concentration was added to a filter paper with a diameter of 60 mm, air-dried for 1 day, and then placed on the bottom of a deep-bottom Petri dish with a diameter of 6 mm. Release 30 worker ants of Yamato termites,
The petri dish was covered with a lid and kept at 28±2°C and 90RH, and the mortality rate was checked at regular intervals.

The results are shown in the table below.

As a result of the test, it was confirmed that a mixed pest control agent of sodium molybdate and sodium tungstate exhibited a remarkable synergistic effect compared to a single pesticide at the same concentration level. (See Figure 1) Test Example 2 A predetermined concentration of molybdenum 51 on a 1XIX10cjn pine post
An irrigation agent containing 1-e and tungsten acid µsium was applied twice at a rate of 100 g/rrf and placed on the bottom of a deep petri dish. Twenty worker termites were released and kept in a petri dish with a lid under conditions of 25±1°G and 85RH or higher, and the mortality rate and the degree of damage to wood chips (weight loss rate) were checked at regular intervals.

As a result of the test, similar to Test Example 1, a remarkable synergistic effect was observed in the mixed pest control agent of ferrous molybdate and calcium tungstate.

Next, examples of the present invention will be shown, but the present invention is of course not limited to these.

Example 1 1 part of sodium molybdate, 2 parts of sodium tungstate, 1 part of 3-iodo-2-provinyl p-buty-rho carbamate, 35 parts of diatomaceous earth, 56 parts of clay, 3 parts of fulric acid sulfonate, 3 parts of poxymethylcellulose Two parts are ground and mixed to obtain an irrigation agent. This is diluted with water and sprayed or coated on the surface of the wood to be treated for insect repellency and antiseptic treatment, or the wood is immersed in the diluted solution.

Example 2 Ri2μ oil containing AμKilResoμSinoμ as the main component.
81111170 parts of reso-sinol formaldehyde, 5 parts of molybdenum ore, 10 parts of calcium tungstate
1 part, 3 parts of clop-pyrifos, and 12 parts of tributyltin terephthalate are sufficiently stirred and mixed to obtain an insect repellent and antiseptic treatment agent. This size solution was applied to both sides of a lauan veneer with a thickness of 1.4 mm and a moisture content of 10% at a rate of 13 g/900i per side, and on both sides a lauan veneer with a thickness of 0.7 mm and a moisture content of 14 to 15% was applied. Each veneer is stacked on top of each other and weighs 10kg at room temperature.
After compressing for 20 minutes at a pressure of /cll, the temperature is 120°C.
The sample was inserted into a hot press maintained at a temperature of 9 Kf/cd and hot pressed for 1 minute to obtain plywood.

When this plywood was subjected to a termite damage test, it showed a high effectiveness in preventing damage even after one month.

On the other hand, mild feeding damage was observed in a control plywood obtained by the same treatment except that 15 parts of tungsten acid to 3 parts of μpyrifos were used as insecticidal and insect repellent ingredients.

Example 3 10 rne of an aqueous solvent containing 196i of ammonium molybdate, 1% of sodium tungstate, and 1% of benzalkonium chloride is mixed with 1 g of α-cellulose and molded into a pellet to obtain a bait agent. When these were placed under houses and in the surrounding soil, they exterminated entire areas of termites through cannibalism and prevented damage to houses.

On the other hand, when a control bait agent prepared in the same manner except for containing 2% niummonium molybdate as an insecticidal and insect repellent ingredient was used, it was not able to eradicate the entire prefecture, but some houses suffered from feeding damage. Ta.

[Brief explanation of the drawing]

FIG. 1 shows the relationship between the mortality rate after 10 days and the concentrations of molybdenum and tungsten components in Test Example 1, and the area above the solid line shows the synergistic effect region. Figure 1

Claims (3)

[Claims] (1) A termite control agent characterized by containing both a molybdenum compound and a tungsten compound. (2) The termite control agent according to claim (1), which contains both a molybdenum compound and a tungsten compound together with a termite attractant. (3) A method for preventing insects from wood, which comprises applying to wood a termite control agent containing both a molybdenum compound and a tungsten compound.