JPH02247102A - Insecticide for septic tanks and method for combating insect pests ion septic tanks - Google Patents

Abstract

PURPOSE:To obtain the title insecticide which manifests excellent controlling effect with a relatively small amount, moreover with only once treatment and keeping the controlling effect high for a long period of time by admixing an insect growth inhibitor to a specific substance. CONSTITUTION:An insect growth inhibitor such as pyriproxyphene or hydroprene, preferably in addition, an insecticide such as diazinon are added to a substance which is insoluble in water and floats on it and the insecticide is dissolved. The solution, as it is, is sprayed or dropped in the waste water in the septic tank or, when needed, combined with an aerosol propellant and atomized in the septic tank to control the sanitary insect pests such as mosquitoes or unpleasant insect such as flies occurring and living in the tank by easy application without any damage to the essential functions of the septic tank. The concentration of the insect growth inhibitor is 0.05 to 10wt.% in the liquid floating on the waste water.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pest control agent and a pest control method for controlling pests such as sanitary pests and nuisance pests that occur in septic tanks.

[Conventional technology]

In recent years, with the spread of septic tanks, sanitary pests such as insects and unpleasant pests such as butterflies have emerged from the septic tanks, which has become a problem.

Septic tanks are required to be maintained and inspected at regular intervals, but when the maintenance worker opens the manhole and works, butterflies and flea flies may fly to the worker's face. It is desirable to prevent this from entering the mouth and nose, as it can cause problems during work.

In addition, the force generated in the septic tank enters the room from the septic tank,
BACKGROUND ART It is desired to control harmful insect pests such as butterflies, which sting humans and lodge on indoor walls, causing discomfort to humans.

Conventionally, methods for controlling sanitary pests and unpleasant pests that occur in septic tanks include methods in which a DDVP plate containing DDVP is hung in a septic tank to control adult insects, or organic phosphorus or pyrethroids are used to control adult insects. A method of exterminating adult insects by directly spraying or atomizing an oil agent containing a type of insecticidal ingredient as an active ingredient into the septic tank, and adding insect growth inhibitors such as organophosphorus and pyrethroid insecticidal ingredients and methoprene to the wastewater of the septic tank. Emulsions and water solvents as active ingredients,
A known method is to spray hydrating agents to exterminate larvae.

[Problem to be solved by the invention]

There are various types of septic tanks that purify sewage such as frozen fields and domestic wastewater discharged from households, but recently, full aeration type septic tanks and separate aeration type septic tanks, which purify sewage by pumping air into it, are being used in general households. It is widespread. DDVP plates are used to exterminate pests that occur in aeration-type septic tanks, but the air that is pumped into the sewage is sent into the septic tank room, causing indoor air in the septic tank to leak to the outside. There was a problem in that the chemicals transpiring from the DDvP plate also leaked to the outside and did not reach an effective concentration, making it impossible to effectively exterminate pests in the septic tank. Furthermore, there are known methods of directly spraying or atomizing organic phosphorus oil or pyrethroid oil into the septic tank in order to exterminate adult pests that occur in the septic tank. Although the adult insects in the purifying loquat can be exterminated, the larvae and moths cannot be completely exterminated, so there is a problem that the adult insects emerge from the larvae and the dance, making it impossible to maintain the effect for a long period of time. Furthermore, in order to completely control the pests, it is necessary to directly spray or atomize the inside of the septic tank several times over a period of 1 to 3 weeks, which is troublesome.

In addition, as a method to exterminate larvae, organic phosphorus is added to wastewater.
There are known methods of spraying emulsions, aqueous solutions, and wettable powders containing pyrethroid insecticides as active ingredients, as well as spraying wettable powders containing methoprene as an active ingredient, but fly larvae enter wastewater. Because they grow by repeatedly crawling up the walls and scum of septic tanks from wastewater, they could only be controlled by spraying highly concentrated chemicals into the wastewater. However, spraying at high concentrations has a negative effect on activated sludge due to the emulsifiers and solvents contained in the chemicals, and there is a risk of losing the function of the purifying species, so it is very difficult to set the spray amount, and anyone can easily set the spray amount. There was a problem that it was not something that could be sprayed. In addition, a septic tank that treats only frozen ground in a typical household uses 50 liters of water per person per day, and a septic tank that processes not only frozen ground but also domestic wastewater uses 200 liters of water per person per day. The emulsions, water solvents, and hydrating agents sprayed on the sewage water in the septic tank are uniformly dispersed in the septic tank, so the amount of water newly entering the septic tank is discharged along with the sewage, reducing the concentration of the chemicals and increasing the insecticidal effect. The problem was that it did not last for a long time. Additionally, in order to increase the effectiveness of extermination, it is necessary to refrain from using water for several hours after spraying the chemicals, which is extremely inconvenient for daily life.

As mentioned above, although there are various methods for controlling various pests that occur in septic tanks, these methods are fully satisfactory in terms of control effect, sustainability of control effect, and impact on activated sludge. There was no.

Therefore, the main object of the present invention is to provide a pest control agent for septic tanks that can control sanitary pests, unpleasant pests, etc. that occur and live in septic tanks with a relatively small amount of chemicals, and that has a long-lasting control effect with one spraying. and to provide a pest control method.

Another object of the present invention, in connection with the above object, is to provide a pest control agent and pest control method for a septic tank that can be easily used by anyone without losing the essential functions of the septic tank.

[Means to solve the problem]

According to the present invention, in order to achieve the above object, there is provided a pest control agent comprising a liquid substance that is insoluble in water and floats on water containing an insect growth inhibitor or further an insecticide, and a pest control agent that is treated in a septic tank. Provided is a pest control method characterized by:

[Operation and mode of the invention]

The inventors of the present invention have conducted intensive research on methods for controlling various pests that occur and live in septic tanks.
From the relationship between the ecology of the various pests that live there and the structure of the septic tank,
By using a liquid substance that is insoluble in water but floats in water in combination with an insect growth inhibitor or an insecticide, it can last for a longer period of time than conventional emulsions, water solvents, and wettable powders of organophosphorus and pyrethroid insecticides. Moreover, it was discovered that various pests can be efficiently controlled. Furthermore, by using the above-mentioned liquid substance in combination with an insect growth inhibitor or an insecticide, a sufficient control effect can be obtained even if the amount of insect growth inhibitor or insecticide used is reduced, and moreover, it is possible to obtain a sufficient control effect even if the amount of the insect growth inhibitor or insecticide used is reduced. It was found that there was no effect. The present invention was completed based on this knowledge, and its characteristics are as follows:
Insect growth inhibitors or even insecticides are dissolved in a liquid substance that is insoluble in water but floats on water, and then disposed of in a septic tank.

To explain the effect of the present invention in relation to the ecology of various pests, as mentioned above, pest larvae grow while repeating actions such as entering sewage and climbing from sewage onto the walls and scum of septic tanks. . Therefore, when the pest control agent of the present invention is sprinkled or sprayed on the wastewater of a septic tank, the agent floats on the surface of the wastewater and efficiently contacts the larvae of various pests living in the surface of the wastewater and the scum.
Larvae that come into contact with the drug grow into cicadas, but do not emerge. Therefore, the number of pests in the septic tank is reduced, and the pest control effect can be increased. Furthermore, even in a septic tank where air is sent to the septic tank for aeration, the chemicals are always floating on the surface of the sewage water, so they do not affect the activated sludge in the septic tank and do not lose the functionality of the septic tank.

Furthermore, since the chemical is always floating on the surface of the wastewater, the active ingredient, the insect growth inhibitor, has fewer opportunities to come into contact with alkaline components such as collected urine and microorganisms, further suppressing decomposition and maintaining the pesticidal effect for a long time. .

Next, the present invention will be described in detail in relation to the structure of a septic tank.

As an example of the structure of a septic tank, the structure of a separate aeration type septic tank is shown in Fig. 1, and the structure of a total aeration type septic tank is shown in Fig. 2.The chambers of the separate aeration type septic tank 1 are: sedimentation chamber A1 aeration chamber B1 sedimentation chamber C.
It is divided into four rooms: 1 disinfection room E, and the wastewater 2 sequentially flows in the direction of the arrow from the precipitation separation room A to the aeration room B1 precipitation room C1 disinfection room E. In the diagram, D is the disinfectant tank, 3 is the blower 1
4 is a diffuser plate, 5 is a manhole, 6 is scum (floating matter),
7 is a bubble. The sewage 2 has a structure in which it advects from the bottom of the pot to the next chamber, so even if new frozen ground or domestic wastewater comes in, the chemicals floating on the surface of the sewage will advect to the next chamber and be discharged. The drug remains in place indefinitely, and its efficacy can be maintained over a long period of time.

On the other hand, as shown in Fig. 2, the chambers of the fully aerated septic tank 10 are divided into three chambers: aeration chamber B, sedimentation chamber C, and disinfection chamber E, and the wastewater 2 flows from the aeration chamber B to the sedimentation chamber C at the bottom of the tank. The activated sludge is separated by sedimentation in the sedimentation chamber C, and then disinfected in the disinfection chamber E and discharged. The chemicals floating on the surface of the aeration chamber B will not be advected to the next chamber C and discharged, and like a separate septic tank, the chemicals will remain in the aeration chamber B forever, making it possible to maintain their effectiveness over a long period of time. .

Hereinafter, the pest control agent and pest control method of the present invention will be specifically explained. The liquid substance that is insoluble in water and floats on water according to the present invention includes aliphatic hydrocarbons such as kerosene and kerosene, and examples of commercially available products include No. 0 Solvent H (manufactured by Kuchimoto Ishiura Co., Ltd.) and No. O Solvent M. (manufactured by Nippon Oil Co., Ltd.), IP Solvent 2028 (manufactured by Idemitsu Petrochemical Co., Ltd.), etc. can be used. In addition, oils and fats such as olive oil, rapeseed oil, and sesame oil are examples of liquid substances that are insoluble in water and float on water, but are not limited to these.

The insect growth inhibitor includes 2-[1-methyl-2-
(4-phenoquinphenoxy)ethoxy] pyridine (
Generic name: pyriproxyfen (hereinafter referred to as pyriproquinfen), 11-methoxy-3,7,11-1-limethyl-2,4 dodecagonoic acid-1-methylethyl ester (-Ship name: methoprene, hereinafter referred to as methoprene) 1-(4-chlorophenyl)-3
Examples include -(2,6 difluorobenzoyl)urea (-ship name: diflubenzuron).

In addition, the insect growth inhibitors act to inhibit emergence from the moss and have no insecticidal effect on adult insects, so in order to supplement this, conventional insecticides such as organophosphorus insecticides, pyrethroid insecticides, etc. Carbamate insecticides can be blended.

For example, organophosphorus insecticides include fenitrothion,
Examples of pyrethroid insecticides include diazinon, dichlorvos, malathion, and pyridafention; examples of pyrethroid insecticides include allethrin, phthalthrin, exmin, smithrin, and resmethrin; and examples of carbamate insecticides include propoxa-methoxacycin; these insecticides may be used alone. , two or more types can also be used in combination.

As a method of treating the septic tank, it is possible to spray or drip the raw liquid into the sewage water of the septic tank, but
If necessary, it can also be treated by making an aerosol compounded with a propellant and spraying it into the septic tank.

Examples of the propellant include propellants such as liquefied petroleum gas, dimethyl ether, and fluorocarbon, and these may be used alone or in combination of two or more.

The concentration at which the insect growth inhibitor is dissolved in a liquid substance that is insoluble in water but floats on water and the amount to be treated in the septic tank may be determined as appropriate depending on the dosage form, the type of septic tank, and the usage situation, and are not particularly limited. do not have. For example, it is good to mix an insect growth inhibitor in a liquid substance that is insoluble in water but floats on water, usually about 0.05 to 10% by weight, preferably about 0.5 to 5.0% by weight. Even when an insecticide is added, sufficient efficacy can be obtained at a similar concentration. In addition, the amount to be sprinkled or sprayed on the septic tank is 1.0 to 1.0 per area of sewage water in the septic tank.
50m1. The amount is preferably about 5.0 to 20.0 ml.

〔Example〕

Hereinafter, the present invention will be specifically explained by showing Examples and Comparative Examples.

Examples 1 to 4 and Comparative Example 1 A kerosene solution containing an insect growth inhibitor and a 5% emulsion of Pytex (fenthion) were sprayed on 10 liters of an artificial culture medium, and the sustainability of the eclosion-preventing effect on butterfly larvae was investigated. The implementation mode is as follows.

Test agent: NOl: pyriproxyfen 0. Oil No. 2 prepared by preparing 5 g of kerosene to 100 ml: Oil No. 3 prepared by preparing 0.5 g of hydroprene to 100 ml with kerosene: Emulsion containing 5% (w/w) fenthion Spraying method: Example 1 Artificial wastewater The test agent (NOI) was sprayed so that biliproxyfen was 1.0 ppm per 10 liters.

per 10 liters of artificial sewage Proxyfen is 0. to lppm Sprinkle the test agent (NOI) so that I clothed it.

High for 10 liters of artificial sewage Droprene becomes 1.0ppm Spray the test agent (NO2) as shown below. Ta.

High for 10 liters of artificial sewage Droprene becomes O,lppm Spray the test agent (NO2) as shown below. Ta.

Fe for 10 liters of artificial sewage tion becomes 1.01) pm. A test agent (NO3) was sprayed on the sea urchin.

Summary of implementation: The test agent was sprayed to a predetermined concentration in a container containing 10 liters of artificial sewage. After that, 1st day, 15th day, 1
At the 2nd, 2nd, and 3rd month, 500 entangled butterfly fly larvae that had been raised for generations were placed in artificial sewage water, and the number of adults that emerged from them was investigated.

At the same time, we conducted a similar test using artificial wastewater without spraying chemicals.
It was set as an untreated area. The test was repeated three times and the average value was calculated. The results are shown in Table 1.

Table 1: Emerging rate of butterflies over the number of days after spraying As is clear from the results shown in Table 1, with the conventional spraying method (Comparative Example 1), the entangled larvae of butterflies do not appear on the first day after spraying. Although no adults were observed to die and emerge, 68% of the adults emerged on the 15th day after spraying. These results show that with the conventional spraying method, almost no chemicals are left in the wastewater of the septic tank on the 15th day after spraying, and a long-term residual effect cannot be expected. In contrast, in Examples 1 to 4 of the present invention, a sufficient anti-eclosion effect was observed even after 3 months had passed after spraying, indicating that the chemical remained stably on the surface of the wastewater and the extermination effect lasted for a long period of time. .

Example 5 and Comparative Example 2 The method of the present invention (Example 5) in which a kerosene solution containing an insect growth inhibitor is sprayed on wastewater, and the conventional treatment method (Comparative Example 2) in which diazinon emulsion is sprayed on wastewater were carried out. At that time, we compared the sustainability of the pest extermination effect in septic tanks and the impact on protozoa living in septic tanks. The mode of implementation is as follows.

Test agent: NOl: Oil agent N02 prepared by preparing 0.5 g of pyriproxyfen in 100 ml with kerosene; emulsion containing 5% diazinon Spraying method: Example 5 Comparative example 2 Test agent ( 20ml of NOI) was sprayed.

Contains sewage from a septic tank as an active ingredient. and adjust the test agent to lppm. (NO2) was sprayed (emulsion 23g was diluted 200 times and sprayed).

Implementation overview: Separate aeration type septic tank (1.14t Hitachi KR-5,5 tank)
The test agent was sprayed into the sedimentation chamber and aeration chamber of the test tube, and 250 liters of water and 1 kg of artificial culture medium were poured into the sedimentation chamber every day. Thereafter, 50 ml of sewage from both the sedimentation separation chamber and the aeration chamber of the septic tank was placed in a polycup, and 50 entangled butterfly fly larvae that had been reared for generations were placed in the cup, and the number of adults emerging from the cup was investigated. The test was repeated three times and the average value was calculated. The results are shown in Table 2. In addition, activated sludge in the aeration chamber was collected before and after spraying the test agent, and the number of protozoa in the activated sludge was investigated. The results are shown in Table 3.

Table 2: Emerging rate of butterflies (%) over the number of days elapsed Table 3: Changes in the number of protozoa (individuals/m1) As is clear from the results shown in Table 2, conventional spraying methods (comparative examples) In 2), the entangled butterfly fly larvae died on the first day after spraying, and no adult flies were observed to emerge, but after spraying 155
On the second day, most of the adult butterflies emerged from the entangled larvae, and no long-term control effect was observed. From this result, it can be seen that with the conventional spraying method (Comparative Example 2), the chemicals in the wastewater are already gone 15 days after spraying. In the case of the treatment method of the present invention (Example 5), the chemical remained on the surface of the wastewater without being discharged from the septic tank until three months after the treatment, so a sufficient control effect was observed for three months.

Furthermore, when comparing the changes in the number of protozoa in the wastewater before and after spraying, the number of protozoa decreased significantly with the conventional spraying method (Comparative Example 2), indicating the influence of chemical spraying. However, in the treatment method of the present invention (Example 5), no change in the number of protozoa was observed, indicating that the septic tank function was not lost.

Examples 6 and 7 and Comparative Examples 3 and 4.5 A method of the present invention in which an aerosol filled with a gas and a solution containing an insect growth inhibitor and an insecticide is sprayed into a septic tank (Example 6)
), the method of the present invention in which a septic tank is sprayed with an aerosol filled with a solution and gas containing only an insect growth inhibitor (Example 7), and the method of spraying an emulsion containing an insect growth inhibitor as an active ingredient (comparative example) 3) The conventional spraying method of spraying Sumithion oil with a sprayer (Comparative Example 4) and the conventional spraying method of hanging DDVP plates (Comparative Example 5) were carried out in a general household septic tank, and pest control was compared. The mode of implementation is as follows.

Test agent: NOl: 1.0 g of pyriproxyphene and d-T
An aerosol containing 0.2 g of 80 resmethrin dissolved in 202 g (180 ml) of IP solvent and filled with DME/LPG gas (120 ml).

NO2: Aerosol (220 g per can) containing 1.0 g of biliproxyfen dissolved in IP Solvent 2022 O28 (180) and filled with DME/LPG gas (120 ml) NO3: 5% biliproxyfen (W/W) Containing emulsion NO4: Oil agent NO5 containing 1% (W/W) fenitrothion: Plates containing 16g/sheet of DDVP Spraying method: Example 6 Sample agent (NOI) per septic tank sewage area
was sprayed for 10 seconds (spray amount for 10 seconds was approximately 25 g).

Example 7 Sewage area of septic tank 1rr? Hit test agent (NO
2) was sprayed for 10 seconds (spray amount for 10 seconds was approximately 25 g).

Comparative Example 3 2.3 g of the test agent (NO3) was diluted 200 times with water and sprayed on the wastewater of a septic tank so that the amount of biliproxyfen was the same as in Example 7.

Comparative Example 4 Test agent (NO4) per sewage area of septic tank
50ml was directly sprayed.

Comparative Example 5 One sheet of the test agent (NO5) was hung in the room of a septic tank.

Implementation overview; Separate aeration type septic tank (Hitachi KR-7,7 tank 1.4 t) and fully aerated type septic tank (
A Hitachi M-758, o, 9t) was treated with the chemical, and the number of adult butterflies emerging from the septic tank thereafter was investigated. The results are shown in Table 4. The meanings of the numbers of individuals in the table are as follows.

Number of individuals: 1000 or more adults in the septic tank + 20 to 199 adults in the septic tank ± 1 to 19 adults in the septic tank 0 adults in the septic tank Table 4: Total number of insects in the septic tank according to the number of days that have passed Type:
Total aeration type septic tank As shown in Table 4, in the method of the present invention (Example 6),
The number of adult insects decreased on the first day after the chemical treatment, and the occurrence of insects was suppressed for three months thereafter, demonstrating long-term control.

Furthermore, in the method of the present invention (Example 7), 1
Although no reduction in the number of adult butterfly flies was observed at 0, the occurrence of adult butterfly flies was kept to a low level from 155 days after treatment to 3 months after treatment, and a long-term control effect was observed.

On the other hand, in Comparative Example 3, in which an emulsion in which the insect growth inhibitor was dispersed uniformly throughout the wastewater, the number of adult butterflies gradually decreased after the insect growth inhibitor was sprayed; It recovered to ++ three months after treatment, and long-term control was not possible.

The reason for this is that as new wastewater flows in every day, the uniformly dispersed medicine moves to the next chamber and is eventually discharged, causing the concentration of the medicine to gradually decrease and the medicine to run out. This is thought to be the cause.

In addition, in Comparative Example 5, which is a conventional treatment method, air is sent into the septic tank, so the chemicals volatilized from the plates leak outside the septic tank and do not reach an effective concentration sufficient to exterminate butterfly flies. No effect was observed during this period.

〔Effect of the invention〕

According to the pest control agent and the pest control method of the present invention, since the sprayed chemical and the pest larvae live in the same place, the pests come into contact with the chemical efficiently, and even if the amount of the chemical used is small, the pest control effect is excellent. is obtained. Furthermore, considering the structure of the septic tank, if the chemicals are on the surface of the wastewater, they will not be advected to the next chamber, and if the drugs are on the surface of the wastewater, they will be difficult to decompose, so the pest control effect can be maintained for a long period of time. Another advantage is that since the chemical remains on the surface of the wastewater, it has no effect on activated sludge, and anyone can easily spray it on the septic tank.

Furthermore, by using an insecticide together with an insect growth inhibitor, the effect of inhibiting the emergence of insect pests from cicadas and the insecticidal effect on adult insects are synergistically exerted, and an extremely effective and long-term pest control effect can be obtained.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a separate aeration type septic tank, and FIG. 2 is a schematic diagram of a total aeration type septic tank. A is a sedimentation separation room, B is an aeration room, C is a precipitation room, D is a disinfection room, 1 is a separate aeration type septic tank, and 10 is a total aeration type septic tank.

Claims (4)

[Claims] (1) A pest control agent containing an insect growth inhibitor in a liquid substance that is insoluble in water and floats on water. (2) The pest control agent according to claim 1, further comprising an insecticide. (3) A pest control method characterized by treating a septic tank with a pest control agent made by containing an insect growth inhibitor in a liquid substance that is insoluble in water and floats on water. (4) A pest control method characterized by treating a septic tank with a pest control agent made by containing an insect growth inhibitor and an insecticide in a liquid substance that is insoluble in water and floats on water.