JP2003063902A - Termite repellent granule and termite repellent method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide termite repellent granules, which, even in their granular form, can prevent termites from passing through a granule layer. SOLUTION: Carriers such as steamed wood granules or granulated steamed wood powder (steamed sawdust) are impregnated with a termite repellent agent, and used as the termite repellent granules. The steamed wood is obtained by applying pressurized vapor to the wood under a condition of, for example, a temperature of 90-200 deg.C and a pressure of 0.1-1.5 MPa. Alternatively, the steamed wood can also be obtained by first applying vapor to the wood under a condition of a temperature of 80-99 deg.C and a normal pressure, and drying the wood at a temperature of 100-150 deg.C. Sapwood may be used as the steamed wood, and quick-acting pesticides can be used as the termite repellent agent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a termite controlling granule useful for protecting houses and the like from damage by termites.

[0002]

2. Description of the Related Art Termites usually have a nest (colony) outside the house and often infiltrate into the underfloor of the house by diving under the ground. Therefore, the wood around the floor such as the base, the floor bundle, and the Daihiki is easily damaged by food. As a method for preventing termites or for controlling termites, it is practiced to dissolve an insecticide or the like in a solvent, spray this solution (liquid agent) under the floor of a house, and impregnate the insecticide into the soil. . However, spraying of liquid agents is regarded as one of the causes of mist during spraying, health problems of workers due to volatilization of solvent, and sick house syndrome for residents.

Therefore, as a safer under-floor treatment instead of the liquid agent, a method of using granules (granule treatment method) is increasing. Japanese Examined Patent Publication No. 7-103004 discloses an ant-preventive granule obtained by impregnating a porous granular carrier (sintered product such as vermiculite, bentonite, kaolinite, perlite, natural pumice, silicazil, etc.) with an insecticide. It is disclosed that the granules are applied under the floor of a house.

[0004] In addition, at the Japan Shirouari Countermeasures Association,
The amount of liquid agent to be sprayed to the underfloor soil is specified for the marginal preventive treatment of new houses and the marginal control of existing houses. The spray amount is specified as 3.0 to 5.0 L / m ² . The most important factor in the application of liquid agents in soil treatment is the thickness of the chemical liquid treatment layer (barrier layer), which is 5.0
It is said that in the case of L / m ² spraying, the thickness of the treatment layer formed under the soil surface of the side wall of the foundation and the bund stone is 30 mm or more. On the other hand, the amount of the granules applied is an amount corresponding to the amount of the liquid agents applied (3.0 to 5.0 L / m ² ).

However, in the case of a granule using a mineral base material having a large bulk specific gravity as described in the above Japanese Patent Publication No. 7-103004, in order to secure a treatment layer of 30 mm or more, 3 to 4 parts of the liquid preparation are used. Double volume (amount) is required, and there are many problems in terms of both quantity and economy. Therefore, in the granule treatment,
In order to secure a treatment layer, various measures have been taken such as thickly spraying around the cloth foundation and the side wall of the bunk stone during spraying. However, if there is uneven distribution of granules, a thin portion of the treatment layer may occur, and termites may invade, resulting in insufficient effect.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to prevent termites from passing through the granule layer even in the case of granules. It is to provide a granular agent for controlling termites and a method for controlling termites.

[0007]

Means for Solving the Problems The inventors of the present invention have made intensive studies to solve the above problems, and have conceived to use wood chips as granules, contrary to conventional wisdom. That is, common sense in the spraying industry of termite control agents, if there is a piece of wood under the floor, there is a risk of causing termites as bait of termites, therefore, when there is a piece of wood under the floor when spraying the termite control agent, It is said that wood chips should be cleaned and removed.

A technique for spraying wood pieces under the floor is disclosed in JP-A-11-158020.
Also in this publication, the wood pieces are not simply sprayed under the floor, but a double or triple ant control system is applied to prevent the arrival of termites. That is, the above-mentioned JP-A-11-1
In Japanese Patent Publication No. 58020, the underfloor soil portion and the base wood portion such as Daihiki may be subjected to a chemical treatment, and then the bait agent impregnated in pulp or the like may be sprayed on the bundle stone portion or the like.
Even if the insect repellent effect is reduced to a certain extent, it is said that a complete insect repellent system can be configured as a total system (total treatment of soil chemicals, bait chemicals, and xylem chemicals). In other words, it is only possible to spray pulp etc. under the floor by applying other anti-termite treatment such as soil chemical treatment and xylem chemical treatment.
If pulp or the like is sprayed under the floor without treatment with soil chemicals or xylem chemicals, it is impossible to prevent the arrival of termites, which causes damage to the xylem.

Further, Japanese Patent Publication No. 60-11001 discloses that
A method of impregnating the active ingredient into the soil by spraying the granular carrier with the active ingredient for controlling termite control on a granular carrier and then spraying the granular carrier on the soil surface around the building or the soil surface under the floor is disclosed. There is. As the granular carrier, pumice stone,
Although wood pieces are disclosed in addition to bentonite, zeolite, etc., the wood pieces are used only when they are sprayed on the surrounding soil surface, not on the soil surface under the floor. If it is interpreted that the wood chip carrier may be sprayed on the soil surface under the floor, the method of the publication is a method in which the drug is not left on the carrier because the drug is transferred to the soil by spraying water on the granular carrier. As a result, they simply sprayed pieces of wood to feed termites under the floor.

As described above, in the termite control agent application industry, it is common knowledge that it is not preferable to apply wood pieces because it is necessary to remove the wood pieces under the floor by cleaning.

On the other hand, the present inventors have previously found that wood pieces steam-treated under specific conditions are easily eaten by termites, and announced that the steamed wood is useful for bait systems. ["House and termites", Kaiseisha, 2000, pp. 34-35; Timber Industry Vol.
52, No. 12, 1997; The 49th Annual Meeting of the Wood Research Society of Japan (1999), page 597; The 50th Annual Meeting of the Wood Society of Japan (2000), page 691]. The bait system is a bait system that is buried around a house at intervals of 1 to 2 meters, and when termites attack this bait system, the bait system is changed to wood containing bait chemicals (such as slow-acting insecticides). , It is a method to bring the termites back to the nest and eradicate the termites (colony) together. However, since the steamed wood does not have an attracting action, even if the steamed wood is used in the bait system, it is impossible to block the termites from entering the underfloor of the house.

However, the present inventors applied the steamed wood for bait system, which cannot block the invasion of termites, to the application of wood chips to the underfloor, which is generally avoided to be used due to the increased feeding damage of termites. Surprisingly, they have found that they can block the invasion of termites, and have completed the present invention.

That is, the granules for controlling termites of the present invention which have achieved the above objects are granules of granular cooked wood or powdered cooked wood, and termite control agents (fast-acting or slow-acting insecticides, etc.).
It has a gist in that it is impregnated with. The steaming is performed at a temperature of 90 to 200 ° C. and a pressure of 0.1 to 1.5 MPa.
It may be carried out by causing pressurized steam to act on the wood under the conditions described above, and is carried out by allowing steam to act on the wood under conditions of a temperature of 80 to 99 ° C. and normal pressure and then drying at a temperature of 100 to 150 ° C. May be. The wood can be effectively used even if it is sapwood.

According to the termite controlling granules, granular cooked wood (or powdered cooked wood granules such as sawdust-like steamed wood granules) is used as a carrier for termite control agents. ,
The apparent specific gravity (sometimes referred to as bulk specific gravity or bulk density) of the carrier can be reduced. Therefore, it is generally 3-5k
Even if the granules are sprayed under the floor of the house with a spraying amount of about g / m ^{2, the} termite control layer can be thickened and the termites can be blocked from passing through the granule layer. For example, when a fast-acting insecticide is used as a termite control agent, it is possible to prevent termite invasion with an extremely high probability. Even when a slow-acting insecticide is used as a termite control agent, the termite prefers to eat because of the large thickness of the granule layer, which causes termites to eat granules (probability of trapping termites).
Can be increased, and can prevent termites from penetrating. In addition, in both cases of fast-acting insecticides and slow-acting insecticides, even if the termites pass through the granule layer and know the presence of underfloor wood (base, floor bundle, Daihiki, etc.), the termites Because we know the existence of steamed wood (granule layer),
Selectively attacks steamed wood (granules). Therefore, it is possible to block the termites from passing through the granule layer and damaging the underfloor wood substantially reliably.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, a termite controlling granule is produced by impregnating (or supporting) a termite controlling agent on a granular carrier obtained from steam-treated wood.
As the wood used for the steamed wood, wood containing termite repellent components (such as taxonophine, quercetin, naringenin, myricetin, aromadendrin, flavonoid derivatives such as isosacratinen), for example, pine wood (red pine, larch etc.) , Beech family wood (beech, etc.) can be used. When steam is applied to these woods under predetermined conditions (steaming treatment), termite repellent components are decomposed and removed, so that cooked woods can be selectively eaten by termites over non-steamed woods (below. , Referred to as selective feeding).

As the above-mentioned wood, a portion having a high utility value as a wood product (wooden house, furniture, etc.) such as heartwood may be used, but sapwood (backboard, etc.), end material (wood near the mouth, etc.) ), Thinned timber and other parts with low utility value may be used. Even in parts with low utility value (especially sapwood),
Like heartwood, steaming can enhance selective feeding.

Further, the wood to be steamed may be wood obtained by roughly processing a raw wood (a log material, a plate material, etc.) or finely crushed wood (a chip-shaped wood, etc.), or a powdered material such as sawdust-like wood. It may be wood or the like.

The steaming temperature is, for example, 90 ° C. or higher (preferably 100 ° C. or higher, more preferably 150 ° C. or higher),
The temperature is 200 ° C or lower (preferably 190 ° C or lower, more preferably 180 ° C or lower). Steaming is preferably carried out under pressure, for example, a pressure of 0.1 MPa or higher (preferably 0.5 MPa or higher) and a pressure of 1.5 MPa or lower (preferably 1.1 MPa or lower, more preferably 1.0 MPa or lower). . The steaming time can be appropriately selected depending on the steaming temperature and steaming pressure, and is, for example, 5 minutes or longer (preferably 10 minutes or longer, more preferably 30 minutes or longer), 3
It is 00 minutes or less (preferably 200 minutes or less, more preferably 100 minutes or less). If the cooking conditions are too weak (for example, if the cooking temperature is too low and / or if the cooking time is too short), the removal of the repellent component is insufficient, and the selective feeding property cannot be enhanced. On the other hand, if the cooking conditions are too strong (for example, if the cooking temperature is too high and / or if the cooking time is too long), not only the repellent component but also the feeding promoting substance may be decomposed and removed. Eating ability decreases.

It should be noted that it is not always necessary to pressurize during steaming, and even if the pressure is about normal pressure, it is steamed at a specific temperature and then dried under normal pressure under specific conditions to enhance the selective feeding property. You can The cooking temperature is, for example, 80 ° C.
Or more (preferably 85 ° C or more, more preferably 90 ° C
Or higher) and 99 ° C or lower (preferably 98 ° C or lower, more preferably 97 ° C or lower). The cooking time is 2
Time or more (preferably 3 hours or more, more preferably 4
Time or more), 30 hours or less (preferably 20 hours or less,
More preferably 15 hours or less). The drying temperature is, for example, 100 ° C. or higher (preferably 105 ° C. or higher,
More preferably 110 ° C or higher), 150 ° C or lower (preferably 145 ° C or lower, more preferably 140 ° C or lower)
Is. The drying time is, for example, 10 hours or more (preferably 20 hours or more, more preferably 30 hours or more), 1
It is 00 hours or less (preferably 80 hours or less, more preferably 70 hours or less). When operating at normal pressure,
Since a pressure device (autoclave, etc.) is not required, the steaming device can be simplified.

When the steam treatment is performed, the lid (pit) of the conduit (or the temporary conduit) opens due to the pressure difference, or the cell wall of the conduit (or the temporary conduit) is slightly broken or deformed. Can also be made easier to penetrate.

The steam-treated wood (powdered wood such as sawdust, crushed wood, rough-processed wood, etc.) can be, if necessary,
Granulate. For example, powdered wood, such as sawdust wood, is granulated by granulation with a suitable adhesive. Further, the crushed wood and the rough-processed wood may be granulated or chipped by further crushing, if necessary, after being made into powder such as sawdust, and then treated in the same manner as the powdered wood to be granulated. May be. When the granular wood of a suitable size is steamed, the granulation process is not necessary.

Further, the steam-treated wood is impregnated with a termite controlling agent prior to or after the granulation treatment. The method of impregnation is not particularly limited, but, for example, a termite controlling agent may be used in an appropriate solvent (aqueous solvent, organic solvent, etc.).
A method of immersing wood in a chemical solution dissolved in, a method of spraying or applying the chemical solution to wood, a method of pressurizing the chemical solution into wood, eliminating air inside the wood, and then applying the chemical solution under normal pressure. It can be carried out by a method of injecting the chemical solution into the wood by suction (pressure reduction treatment), a method of mixing a powdery control agent, or the like. In particular, the pressure injection method is most suitable for uniformly impregnating the wood with the chemical. When a solvent is used, it is desirable that the solvent be dried and removed in order to prevent VOC generation.

As the termite controlling agent, various agents can be used, for example, a fast-acting insecticide, a slow-acting insecticide and the like. Examples of fast-acting insecticides include organophosphorus insecticides (phoxime, pyridafenthion, fenitrothion, etc.), synthetic pyrethroid insecticides (cyphenothrin, permethrin, bifenthrin, tralomethrin,
Such as acrinathrin), carbamate insecticides (such as carbaryl, fenobucarb, propoxur), nitroguanidine insecticides (such as imidacloprid, acetamiprid, nitenpyram), chlorophenapyr, fipronil, and cirafluofen. These fast-acting insecticides can be used alone or in combination of two or more kinds.

As the slow-acting insecticide, insect growth regulators (methoprene, phenoxycarb, hydramethylnon,
Diflubenzuron, chlorfluazuron, terfubenzuron, hexaflumuron, buprofezi, tebufenocide, sulfamide, etc.), and boron compounds as food poisoning agents. These slow-acting insecticides can be used alone or in combination of two or more kinds.

The fast-acting insecticide and the slow-acting insecticide may be used alone or in combination. Preferably only fast-acting insecticides are used.

In the termite controlling granules obtained as described above, the content of the termite controlling agent (active ingredient) can be appropriately selected according to the kind of the agent. For example, when using a fast-acting insecticide, the content (g) of the termite control agent (active ingredient) is, for example, 3 to 5,000 g based on the volume (m ³ ) of the raw wood used for the steaming treatment. / M ³ or so, preferably 100 to 1,000 g / m ³ . If the content of the fast-acting insecticide is too small, it will be difficult to prevent the invasion of termites. On the other hand, if the content of the fast-acting insecticide is too high, termites will not like to eat the granules. Therefore, if the termites have passed through the granule layer, they will eat the underfloor wood (large pull, floor bundle, etc.) instead of the granule, making it difficult to reliably prevent feeding damage.

On the other hand, when the slow-acting insecticide is used, the content (g) of the termite controlling agent (active ingredient) is 100 to 5 based on the volume (m ³ ) of the raw wood used for the steaming treatment.
About 30,000 g / m ³ , preferably 500 to 10.0
It is about 00 g / m ³ . If the content of the slow-acting insecticide is too small, the termite nest (colony) cannot be eradicated even if the granules in a predetermined area (for example, the basic concrete) are completely consumed, and the later termites are used in the area. There is a risk that it will get under the floor through. That is, as with the bait system, termites may be allowed to enter the underfloor without knowing the presence of the steamed wood, which may damage the underfloor wood. On the other hand, if the content of the delayed-acting insecticide is too large, the termite may not like to eat the granules, and thus the termite cannot be trapped. As a result, it allows termites to pass through the granule layer, just as if they were simply sprinkled with wood.

The particle size of the granular agent is 50 to 20,000.
The particle size may be in the range of 0 μm, but it is preferable to use a granulating agent having a particle size distribution such that half or more (on a mass basis) of the particle size falls within the range of 100 to 5,000 μm.
If the particle size is too small, it becomes powdery and the spraying work becomes difficult. On the other hand, if the diameter of the granule is too large, termites will easily pass through.

The shape of the granule is not particularly limited, and may be spherical, polyhedral (tetrahedral, etc.), cylindrical, elliptical, indeterminate,
In addition to the chip shape, various shapes such as a shape similar to that called a tablet can be adopted. Also, a plurality of granules may be collected and processed into an aggregate such as a mat.

The granules have a bulk specific gravity of 0.1 to 0.8 g.
/ Cm ³ approximately in the range of what can be used but, preferably, the bulk density to use of about 0.2 to 0.6 g / cm ^3. The bulk specific gravity of the granule can be controlled by adjusting the particle size.

The granules obtained as described above can be sprayed at a suitable place, for example, under the floor of a house, to prevent feeding damage to the house (particularly underfloor wood) from termites. That is, since the granules use steamed wood as a carrier, the bulk specific gravity is small and the granule layer can be thickened. Therefore, when a fast-acting insecticide is carried, it is possible to prevent termites from entering with a high probability. When a slow-acting insecticide is carried, the steamed wood as a carrier can be selectively eaten by termites, so that termites can be trapped and the termites can be prevented from penetrating. Furthermore, even if a termite passes through the granule layer and reaches the underfloor wood, the termite is surely in contact with the granule (steamed wood) before that and knows its existence. Also eats granules selectively. Thus, termites can be virtually reliably blocked from passing through the granule layer and feeding on the underfloor wood.

The amount of the granules applied is not particularly limited technically, for example, 1 kg / m ² or more (preferably 2 kg / m ^2).
Or more, more preferably 3 kg / m ² or more), 8 kg /
It may be about m ² or less (preferably 7 kg / m ² or less, more preferably 5 kg / m ² or less). In reality, it is about 3 to 6 kg / m ² . Since the granules of the present invention have a low bulk specific gravity, the granule layer can be thickened and the termites can be reliably blocked even with the above-mentioned spraying amount. The thickness of the granule layer is preferably, for example, 20 mm or more.

The granule layer may be evenly distributed over the entire surface under the floor, or may be non-uniformly distributed so that the amount of spray on the side wall of the cloth foundation or bunk stone, where termites easily enter, is increased. Good. For example, termites often crawl out from the soil near the cloth foundation that surrounds the underfloor of a house. Therefore, the amount of spraying at that portion may be about 2 to 3 times the amount of spraying at other places. Moreover, a groove (for example, a depth of 30 to 40) is formed inside the cloth foundation.
It is also possible to dig a groove of about mm and disperse the granules intensively on the relevant portion.

After spraying the granules, the underfloor may be monitored as needed. Then, if it is found as a result of the monitoring that the granules are completely consumed in a certain area, the granules may be additionally sprayed to the area.

[0035]

The present invention will be described in more detail with reference to the following examples. However, the present invention is not limited to the following examples, and may be appropriately applied within the scope of the above and the following points. It is of course possible to make changes and implement them, and all of them are included in the technical scope of the present invention.

Experimental Example Sapwood of Japanese red pine was steamed (autoclaved) at a temperature of 180 ° C. and then dried in the sun. This steamed wood has a drug solution (silafluofen solution, cifenotrin solution,
Acetamiprid solution or chlorophenapyr solution) was impregnated by pressure injection (impregnation amount: 6 g / m ³ or 150
g / m ³ ). After air-drying at room temperature for 2 weeks, a rectangular parallelepiped (10 m
It was adjusted to a test piece of m × 10 mm × 20 mm).

Dental plaster was poured into the bottom of a cylindrical incubator having a diameter of 9 cm and a height of 7 cm and dried. The test was laid on the center of the plaster via a nylon sheet and allowed to stand. Yes termite (100 worker ants, 10 soldier ants)
The head) was released and bred in the dark at a temperature of 28 ° C. for 6 days.
Since termites die when they eat the wood, the feeding damage caused by termites was counted as the number of dead worker ants.

As a control, wood impregnated with the chemical solution in the same manner as above except that it was not steamed was placed in a breeding machine in the same manner as above, and the number of dead termites was counted.

The results are shown in Tables 1 and 2.

[0040]

[Table 1]

[0041]

[Table 2]

[0042]

According to the present invention, since steamed wood is used as a carrier for termite controlling agents to form granules, the bulk density of the granules can be reduced and the thickness of the granule layer can be increased. The termites can be selectively (preferentially) made to feed on the granules. Therefore, even if the granules are sprayed under the floor, the termites can be blocked from passing through the granule layer.

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[Procedure amendment]

[Submission date] November 30, 2001 (2001.11.
30)

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

On the other hand, the present inventors have previously found that wood pieces steam-treated under specific conditions are easily eaten by termites, and announced that the steamed wood is useful for bait systems. , it is the [timber industry Vol. 52, N
o. 12, 1997; The 49th Annual Meeting of the Wood Research Society of Japan (1999), page 597; The 50th Annual Meeting of the Wood Society of Japan (2000), page 691]. With bait system, bait trees are buried around the house at intervals of 1-2 m,
When the termites attack this bait tree, the bait tree is changed to wood containing bait chemicals (such as slow-acting insecticides), and the termites bring the chemicals back to their nests to eliminate the termites together with their colonies. is there. However, since the steamed wood does not have an attracting action, even if the steamed wood is used in the bait system, it is impossible to block the termites from entering the underfloor of the house.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0015

[Correction method] Change

[Correction content]

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, a termite controlling granule is produced by impregnating (or supporting) a termite controlling agent on a granular carrier obtained from steam-treated wood.
As the wood used for the steamed wood, wood containing termite repellent components (such as taxonophine, quercetin, naringenin, myricetin, aromadendrin, flavonoid derivatives such as isosacratinen), for example, pine wood (red pine, larch etc.) , Other beech wood (eg beech) can be used. When steam is applied to these woods under predetermined conditions (steaming treatment) , the steamed woods can be selectively eaten by termites rather than non- steamed woods (hereinafter referred to as selective feeding property).

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) A01N 53/08 A01N 55/00 D 55/00 53/00 508A

Claims (7)

[Claims] 1. A granular agent for controlling termites, which is obtained by impregnating granular granular wood or granulated material of powdered vaporized wood with a chemical for controlling termites. 2. A temperature of 90 to 200 ° C. and a pressure of 0.1 to 1.
The granule for controlling termites according to claim 1, wherein steamed wood obtained by causing pressurized wood to act on wood under a condition of 5 MPa is used. 3. Steamed wood obtained by causing steam to act on wood under conditions of a temperature of 80 to 99 ° C. and atmospheric pressure and drying at a temperature of 100 to 150 ° C. is used. The above-mentioned granules for controlling termites. 4. The termite controlling granule according to claim 1, wherein the steamed wood is derived from sapwood. 5. The granular agent for controlling termites according to claim 1, wherein the termite controlling agent is a fast-acting insecticide. 6. A method for controlling termites, which comprises spraying the termite controlling granules according to claim 1 under a floor of a house. 7. The amount of the termite controlling granules applied is 1 to 8 kg /
The termite control method according to claim 6, which is m ² .