WO2012107266A1

WO2012107266A1 - Poison bait-type insecticidal composition for attracting cockroaches and preparing method thereof

Info

Publication number: WO2012107266A1
Application number: PCT/EP2012/050831
Authority: WO
Inventors: Soo II O; Ho Hyun Jang
Original assignee: Henkel Ag & Co. Kgaa
Priority date: 2011-02-09
Filing date: 2012-01-20
Publication date: 2012-08-16
Also published as: KR101272413B1; KR20120091681A

Abstract

The present invention relates to a poison bait-type insecticidal composition for attracting cockroaches and a method for preparing the same, and more particularly, to such a poison bait-type insecticidal composition for attracting cockroaches, which can enhance a cockroach-attracting effect, thereby maximizing the insecticidal effect of the composition a method for preparing the same, and the use of an inactivated dry yeast for attracting cockroaches.

Description

Poison bait-type insecticidal composition for attracting cockroaches and preparing method thereof

The present invention relates to a poison bait-type insecticidal composition for attracting cockroaches and a method for preparing the same, and more particularly, to such a poison bait-type insecticidal composition for attracting cockroaches, which can enhance a cockroach-attracting effect, thereby maximizing the insecticidal effect of the composition and a method for preparing the same. Furthermore, the invention relates to the use of an attractant.

Conventionally, many researches have been in progress on extermination of cockroaches. A well- known technique for exterminating cockroaches mainly includes a poison bait method, an application method, a fuming method, a spraying and dusting method, a flexible trapping method, etc. Among them, the poison bait method or the application method of using a container attached with a pressure-sensitive adhesive is typically known as a cockroach exterminating method that induces cockroaches to approach a cockroach-exterminating means by themselves.

The application method is one in which cockroaches approach the container attached with a pressure-sensitive adhesive, so that they stick to the pressure-sensitive adhesive and thus are no longer moved, thereby exterminating the cockroaches. This method mainly employs an attractive substance or an attractive dietetic substance which enables cockroaches to be attracted to the container.

The poison bait method is one in which cockroaches are induced to eat an insecticide to exterminate the cockroaches. In this method, food preferred by cockroaches and containing an insecticide is placed at a place where they enter and exit to induce cockroaches to eat the food to destroy them. It is known that a dietetic substance for cockroaches and an attractive dietetic substance of actively attracting cockroaches are effective as a poison bait food containing the insecticide, i.e., a bait substance containing an insecticide capable of killing cockroaches. In particular, since a cock- roach'sense of smell is about 100 times better than a human's, the cockroach primarily smells to find food, and eats food preferred by the cockroach using a sense of taste. Thus, the cockroach has a habit of being attracted to a bait substance to eat a poison bait or take the poison bait to his or her home where other cockroaches eat together. The use of this habit facilitates installation and withdrawal of the insecticide. Although cockroaches are not visibly seen, they may eat the poison bait and may be killed at their home. Thus, the poison bait method is widely used as one of cockroach extermination methods as being effective in terms of insecticidal effect and sanitation. Typically, in the poison bait method, only the use of an insecticide itself makes it impossible for cockroaches to eat insecticide, and thus it is required that an attractant serving to block the smell of an insecticidal component and other attractive bait components should be used together to allow cockroaches to be killed after eating an effective ingredient of the insecticide having a strong toxicity. Examples of the dietetic substance for cockroaches as mentioned above include: cereals such as foxtail millet, Japanese millet, proso millet, buckwheat, corn, peanut, soybean, rice bran, etc., beans, or a groats mixture thereof (see Japanese Patent Laid-Open Publication No. Sho 53- 38626); and lees, dry materials of lees, semi-dry materials of lees or bread crumbs, silkworm pupa powder, cinchona bark powder, starch, etc., (see Japanese Patent Laid-Open Publication No. Sho 53-1 13027). In addition, especially, examples of the well-known dietetic substance having attractiveness include starches such as sweet potato, taro, corn starch, etc., flours such as wheat flour, buckwheat flour, rice flour, etc., brans such as rice bran, wheat bran, etc., oil meals such as soybean meal, cottonseed meal, etc., lees such as starch lees, malt lees, etc., byproducts such as fish meal, meat meal, blood meal, etc., soybean, pumpkin, carrot, etc., (see Japanese Patent Laid- Open Publication No. Sho 60-54303); milk, cheese, krill powder, insect powder feed, wheat bran, wheat flour, wood powder, or a mixture thereof (see Japanese Patent Laid-Open Publication No. Sho 62-278930), sesame oil (see Japanese Patent Laid-Open Publication No. Sho 53-91 140), cookie crumbs, cracker crumbs, fish meal, silkworm pupa powder, cinchona bark powder, wheat flour, corn flour, sugar, etc., (see Japanese Patent Laid-Open Publication No. Sho 55-94302). Meanwhile, cockroaches are said to be omnivorous, but it is known that they like to eat protein substances according to many studies.

In addition, examples of the attractive substance include: fatty acid having 4 to 10 carbon atoms and fatty acid ester of polyhydric alcohol (see Japanese Patent Laid-Open Publication No. Sho 48- 58126); aldehyde, keton, phenol, alcohol, amine, carboxylic acid or ester thereof as an aromatic compound having aroma (see Japanese Patent Laid-Open Publication No. Sho 50-42053); residues remained by removing a stimulating component from wood tar or wood vinegar (see Japanese Patent Laid-Open Publication No. Sho 50-46842); non-reductible starch hydrolysate (see Japanese Patent Laid-Open Publication No. Sho 50-88235); maltol and/or ethyl maltol (see Japanese Patent Laid-Open Publication No. Sho 52-38024); aloe plant and /or an extract of the aloe plant (see Japanese Patent Laid-Open Publication No. Sho 61 -291505); and rabbit-ear iris seed oil, iris seed oil, Japanese water iris seed oil, and blackberry-lily seed oil (see Japanese Patent Laid- Open Publication No. Sho 62-135403). Furthermore, a technique is also proposed in which secretions, excreta, extracts thereof of harmful insects such as cockroaches, or the corpses or the outer shells of the insects collectively attract their other colleagues (see Japanese Patent Laid-Open Publication No. Sho 50-95432, Japanese Patent Laid-Open Publication No. Hei 5-4904, and Japanese Patent Laid-Open Publication No.4-34251 1).

However, the dietetic compositions comprising the above-mentioned known dietetic substances for cockroaches or a combination thereof are low in their stability, leading to inevitable microbial spoilage thereof, and thus resulting in a deterioration of appetite of cockroaches. Thus, the degradation of the cockroach-attracting capability cannot be avoided. In particular, such dietetic compositions are not high in the cockroach-attracting effect, and thus entails an inconvenience of having to be dispersely arranged at plural locations. In addition, there occur problems in that even in the case where the dietetic compositions are placed for use at plural locations at one time, a difference exists in uptake of each individual dietetic composition, and hence distrust of users is caused.

In the meantime, since the attractive substance is apt to be high in the production cost due to unstable availability of raw materials and difficulty of production, a satisfactory result is not obtained in terms of a practical aspect.

Moreover, a device for trapping cockroaches (i.e., anti-cockroach trap) has been proposed as a means for exterminating cockroaches, but conventional anti-cockroach traps put on the market has a drawback in that if cockroaches do not enter the traps, they cannot be captured for extermination. In order to complement this drawback, there is proposed a method in which a dietetic substance preferred by cockroaches or an aromatic substance of attracting cockroaches is installed inside the anti-cockroach traps. However, such a method does not achieve a sufficient effect of inducing cockroaches to enter the traps installed on the actual sites such as homes, restraints, and the like.

Accordingly, the present invention has been made to overcome disadvantages involved in the above-mentioned conventional insecticides, and an object of the present invention is to provide a poison bait-type insecticidal composition for attracting cockroaches and a method for preparing the same, which can maximize the cockroach-attracting effect.

To achieve the above object, according to the present invention, inactivated dry yeast is used as an attractant for cockroaches. In another object of the invention, there is provided a poison bait-type insecticidal composition for attracting cockroaches, the composition comprising an inactivated dry yeast.

A preferred embodiment of the present invention relates to a poison bait-type insecticidal composition comprising an insecticidal active ingredient that kills cockroaches, preferably in an amount of 0,01 to 0,1 wt%; a flavoring agent that gives taste and flavor to the composition to attract cockroaches, preferably in an amount of 1 to 10 wt%; optionally a binder that binds the components of the composition, preferably in an amount of 10 to 25 wt%; optionally a stabilizer that serves to prevent chemical and physical changes of the composition while being left to stand or being stored, preferably in an amount of 0,1 to 2 wt%; optionally a preservative that prevents microbial spoilage of the components of the composition preferably in an amount of 0,1 to 5 wt%; optionally a solvent that carries the components of the composition, preferably in an amount of 0,1 to 10 wt%; and an attractant that serves as a cockroach bait and essentially comprises inactivated dry yeast to attract cockroaches, preferably the attractant being the balance of the composition, wherein the weight percents are based on the total weight of the composition.

The insecticidal active ingredient preferably is any one selected from the group consisting of fipronil, hydramethylnon, chlorpyrifos, propoxol, boric acid, fenitrothion, and a mixture of two of more thereof. The attractant essentially comprising the dry yeast preferably uses any one selected from the group consisting of fructose (100%), d-sorbitol, rice flour, rice bran flour, oatmeal, high fructose corn syrup, and a mixture of two of more thereof.

In the attractant essentially comprising the dry yeast, the dry yeast is preferably contained in an amount of 5 to 10 % by weight based on the total weight of the composition.

The flavoring agent may use any one selected from the group consisting of peanut butter oil, apple cider vinegar, and a mixture of thereof.

In a preferred embodiment, the binder is partially hydrogenated soybean oil. The stabilizer may use glycerin monostearate.

The preservative may use any one selected from the group consisting of sorbic acid, sorbate, sodium salicylate, sodium benzoate, paraben, and a mixture of two or more thereof.

The solvent may be any one selected from the group consisting of water, lower alcohol having 1 to 4 carbon atoms, glycerol, and a mixture of two or more thereof.

Also, according to the present invention, there is provided a method for preparing a poison bait- type insecticidal composition for attracting cockroaches, the method comprising the steps of: mixing, based on the total weight of the composition, a flavoring agent that gives taste and flavor to the composition to attract cockroaches preferably in an amount of 1 to 10 wt%, optionally a binder that binds the components of the composition, preferably in amount of 10 to 25 wt%, optionally a stabilizer that serves to prevent chemical and physical changes of the composition while being left to stand or being stored, preferably in an amount of 0,1 to 2 wt%, optionally a preservative that prevents microbial spoilage of the components of the composition, preferably in an amount of 0,1 to 5 wt%, optionally a solvent that carries the components of the composition preferably in an amount of 0,1 to 10 wt%, and an attractant that serves as a cockroach bait and essentially comprises inactivated dry yeast to attract cockroaches, thereby obtaining a mixture; the attractant being preferably the balance of the composition; calcinating the mixture obtained in the mixing step at a temperature of 60 to 70°C, thereby forming a product in the shape of a cookie; and adding an insecticidal active ingredient for killing cockroaches to the cookie product formed in the calcinating step, preferably in an amount of 0,01 to 0,1 wt%, wherein the weight percents are based on the total weight of the composition.

According to the present invention, dry yeast is used as a part of the attractant to maximize the cockroach-attracting effect, thereby maximizing the cockroach extermination effect.

FIGs. 1 to 3 are graphs showing the measurement results of the consumed amount (i.e., the amount of insecticide eaten by cockroaches) of a conventional insecticide for attracting cockroaches and an insecticide according to the present invention Now, the preferred embodiments of the present invention will be described hereinafter in more detail with reference to the accompanying drawings.

A poison bait-type insecticidal composition for attracting cockroaches according to the present invention comprises: 0,01 to 0,1 wt% of an insecticidal active ingredient that kills cockroaches; 1 to 10 wt% of a flavoring agent that gives taste and flavor to the composition to attract cockroaches; 10 to 25 wt% of a binder that binds the components of the composition; 0,1 to 2 wt% of a stabilizer that serves to prevent chemical and physical changes of the composition while being left to stand or being stored; 0,1 to 5 wt% of a preservative that prevents microbial spoilage of the components of the composition; 0,1 to 10 wt% of a solvent that carries the components of the composition; and a balance of the composition comprising an attractant that serves as a cockroach bait and essentially comprises inactivated dry yeast to attract cockroaches, wherein the weight percents are based on the total weight of the composition.

The insecticidal active ingredient serves to kill cockroaches, and can use any one selected from the group consisting of fipronil, hydramethylnon, chlorpyrifos, propoxol, indoxacarb, boric acid, feni- trothion, and a mixture of two of more thereof. The insecticidal active ingredient used in the present invention can be contained in an amount of 0,01 to 0,1 wt% based on the total weight of the composition. If the content of the insecticidal active ingredient is less than 0,01 wt% based on the total weight of the composition, the insecticidal effect of cockroaches intended by the present invention may not be exhibited sufficiently, resulting in insufficient cockroach extermination effect. On the contrary, if the content of the insecticidal active ingredient exceeds 0,1 wt% based on the total weight of the composition, there may be a high possibility that economical dissipation according to the excessive use of an expensive insecticide will be caused and the composition remained after use will act as a toxic substance to other aminals.

The flavoring agent serves to give taste and flavor to the composition to attract cockroaches, can use any one selected from the group consisting of peanut butter oil, apple cider vinegar, and a mixture of thereof. The flavoring agent used in the present invention can be contained in an amount of 1 to 10 wt% based on the total weight of the composition. Highly preferred is apple cider vinegar, advantageously in an amount of 2 to 5 wt% based on the total weight of the composition. If the content of the flavoring agent is less than 1 wt%, the cockroach-attracting effect by fragrance may not be exhibited sufficiently depending on the type of fragrance, resulting in insufficient cockroach extermination effect. On the other hand, if the content of the flavoring agent exceeds 10 wt% based on the total weight of the composition, there will be a risk that the insecticidal function of the insecticidal active ingredient added will degrade along with an increase in cost.

The binder serves to bind the components of the composition, and can use partially hydrogenated soybean oil, i.e., hydrogen-added soybean oil. The binder used in the present invention can be contained in an amount of 10 to 25 wt% based on the total weight of the composition. If the content of the binder is less than 10 wt% based on the total weight of the composition, the function of binding the components of the composition may not be exhibited sufficiently, resulting in deterioration of formulation stability of the composition obtained, and thus causing inconvenience in use. On the other hand, if the content of the binder exceeds 25 wt% based on the total weight of the composition, there may occur problem in that since a cookie product obtained from the composition becomes too hard, it is difficult for cockroaches to eat and take to the place where cockroaches live together.

The stabilizer serves to prevent chemical and physical changes of the composition while being left to stand or being stored, and can use glycerin monostearate. The stabilizer used in the present invention can be contained in an amount of 0,1 to 2 wt% based on the total weight of the composition. If the content of the stabilizer is less than 0,1 wt% based on the total weight of the composition, the function of stabilizing the composition may not be exhibited sufficiently. On the other hand, if the content of the stabilizer exceeds 2 wt% based on the total weight of the composition, there may be a risk that the function of the insecticidal active ingredient or the attractant will be deteriorated.

The preservative serves to prevent microbial spoilage of the components of the composition, and can use any one selected from the group consisting of sorbic acid, sorbate, sodium salicylate, sodium benzoate, paraben, and a mixture of two or more thereof. The preservative used in the present invention can be contained in an amount of 0,1 to 5 wt% based on the total weight of the composition. If the content of the preservative is less than 0,1 wt% based on the total weight of the composition, the function of preventing microbial spoilage of the composition may not be exhibited sufficiently. On the other hand, if the content of the preservative exceeds 5 wt% based on the total weight of the composition, there may occur problem in that since the cockroach-attracting capability is lowered, it is less likely for cockroaches to eat a cookie product obtained from the composition, resulting in a deterioration of the insecticidal effect.

The solvent serves to carry the components of the composition, and can use any one selected from the group consisting of water, lower alcohol having 1 to 4 carbon atoms, glycerol, and a mixture of two or more thereof. Examples of the lower alcohol having 1 to 4 carbon atoms used as the solvent can include alcohol which is in a liquid state at room temperature such as methanol, ethanol, pro- panol, isopropanol, buthanol, etc. The solvent used in the present invention can be contained in an amount of 0,1 to 10 wt% based on the total weight of the composition. If the content of the vehicle is less than 0,1 wt% based on the total weight of the composition, the function of carrying and mixing the the components of the composition may not be exhibited sufficiently, which makes it difficult to obtain a stable composition. On the other hand, if the content of the solvent exceeds 10 wt% based on the total weight of the composition, there may occur problem in that a cookie product is well not molded from the composition and a dough for the cookie product is diluted.

The attractant serves as a cockroach bait and serves to attract cockroaches. The attractant essen- tially comprises inactivated dry yeast. In the attractant essentially comprising the inactivated dry yeast, the inactivated dry yeast can be contained in an amount of 5 to 10 % by weight based on the total weight of the composition. In addition, the attractant can use any one selected from the group consisting of fructose (100%), d-sorbitol, rice flour, rice bran flour, oatmeal, high fructose corn syrup, and a mixture of two of more thereof. It will be appreciated that the attractant occupies the largest portion in the composition, and preferably it is contained as a balance of the composition other than the components of the composition. If the content of the inactivated dry yeast is less than 5 wt% based on the total weight of the composition, the cockroach-attracting effect intended by the present invention may not be exhibited sufficiently, resulting in insufficient cockroach extermination effect. On the other hand, if the content of the inactivated dry yeast exceeds 10 wt% based on the total weight of the composition, there will be a risk that the insecticidal function of the insecticidal active ingredient added or the flavoring function for attracting cockroaches will be degraded.

In addition, a method for preparing a poison bait-type insecticidal composition for attracting cockroaches according to the present invention is defined above.

In a preferred embodiment, 1 to 10 wt% of the flavoring agent, 10 to 25 wt% of the binder, 0,1 to 2 wt% of the stabilizer, 0,1 to 5 wt% of the preservative, 0,1 to 10 wt% of the solvent, and the balance of the composition comprising an attractant are mixed, the weight percents being based on the total weight of the composition. In the mixing step, the functions, properties, contents, and reasons for limitation of the contents of the components of the composition are the same as described above, and thus the repeated description thereof will be omitted to avoid redundancy.

The calcinating step comprises calcinating the mixture obtained in the mixing step at a temperature of 60 to 70°C, thereby forming a product in the shape of a cookie. The calcinating step facilitates the preparation and dealing of the composition used in the present invention.

The insecticidal active ingredient adding step comprises adding preferably 0,01 to 0,1 wt% of an insecticidal active ingredient for killing cockroaches to the cookie product formed in the calcinating step, wherein the weight percent is based on the total weight of the composition. In the insecticidal active ingredient adding step, the insecticidal active ingredient is added to the cookie product, such that when cockroaches eat the cookie product, the insecticidal active ingredient is absorbed into the bodies of the cockroaches to kill and exterminate them.

Hereinafter, the present invention will be described in further detail with reference to preferred Examples and Comparative Examples. It will be obvious to those skilled in the art that these examples are illustrative purposes only and are not to be construed to limit the scope of the present invention. Examples Example 1 :

Table 1 is listed below to examine and illustrate the attracting effect of the inactivated dry yeast essentially used as the attractant and thus the insecticidal effect in the present invention.

Table 1

The mortality rates of cockroaches was experimented based on the Control Examples 1 and 2, the Comparative Example 1 , and the Product Example 1 .

The experiment was conducted such that the mortality rates of German cockroaches as small cockroaches were measured over time in Control Examples 1 and 2, the Comparative Example 1 , and the Product Example 1 while other growth conditions and environments of cockroaches are made the same. The measurement results of the mortality rates were listed in Table 2 below. In addition, the mortality rate per unit weight (1 g) of cockroaches was measured, and the measurement results of the mortality rates were listed in Table 3 below. Table 2

*p<0,05

Table 3

As shown in Table 2, it could be found that in case of Product Example 1 according to the present invention (essentially comprising dry yeast as part of the attractant) showed a relatively excellent insecticidal effect as compared to the case (Comparative Example 1) of not comprising dry yeast while using the same insecticidal component as well as other insecticidal components (Control Example 1 and Control Example 2), thereby effectively exterminating cockroaches. Non-treatment group of Control Example 0 is a group which is not subject to any treatment, and showed no cockroach-killing effect.

Besides, as shown in Table 3, it could be found that the mortality rate per unit weight (1 g) of cockroaches is significantly higher in the case of Example 1 according to the present invention than in other cases. Example 2:

Example 2 was conducted in the same manner as the above Example 1 except that American cockroaches were used instead of German cockroaches. The results were listed in Tables 4 and 5 below.

Table 4

*p<0,05 Table 5

As shown in Tables 4 and 5, American cockroaches showed no remarkable difference unlike German cockroaches.

However, as shown in Table 6 below, it could be found that the cumulative mortality rate of both the German cockroaches and the American cockroaches caused by a secondary transmission was higher in the case of Product Example 1 according to the present invention than in other cases. Table 6

Meanwhile, as shown in Table 7 below, the cumulative mortality rate of both the German cockroaches and the American cockroaches caused by a tertiary transmission showed no remarkable difference.

Table 7

Species Days Cumulative mortality rate(%)

of cockof

Control Control Comparative Product Control roaches expoExample 1 Example 1 Example 1 Example 1 Example 0 sure

German 2 85,56±13,47 67,78±10,18 97,78±3,85 93,33±8,82 0,00±0,00

Cock4 98,89±1 ,92 96,67±3,33 100,00±0,0 98,89±1 ,92 0,00±0,00 roaches

20.0±0.0 3 10,0±0,0 10,0±0,0 20,0±0,0 20,0±0,0 0,0±0,0

7 30,0±0,0 20,0±0,0 30,0±0,0 70,0±0,0 0,0±0,0 Example 3:

The prescription of the poison bait-type insecticidal composition for attracting cockroaches used for household purpose is used, and Comparative Examples (i.e., Comparative Examples 2 (Table 8) and 3 (Table 9)) in which dry yeast is not contained in the attractant and Examples (i.e., Product Examples 2 (Table 10) and 3 (Table 1 1)) in which dry yeast is contained in the attractant were provided as listed in Table 8 below.

Table 8

Components Raw material names Contents (wt%)

insecticidal active

fipronil 0,05

ingredient binder hydrogen-added soybean oil 15,00

fructose 100% 5,00

d-sorbitol 5,00

attractant rice flour 51 ,25

rice bran flour 4,10

dry yeast - peanut butter oil 0,50

flavoring agent

apple cider vinegar 3,00

stabilizer glycerin monostearate 1 ,00

sorbic acid 0,50

preservative

sorbate 1 ,50

vehicle water 13,10

Total 100,00 Table 9

Components Raw material names Contents (wt%) insecticidal active

fipronil 0,05 ingredient binder hydrogen-added soybean oil 15,00

fructose 100% 5,00 d-sorbitol 5,00 attractant rice flour 51 ,25 rice bran flour 4,10 dry yeast - peanut butter oil 1 ,50 flavoring agent

apple cider vinegar 3,10 stabilizer glycerin monostearate 1 ,00 sorbic acid 0,50 preservative

sorbate 1 ,50 vehicle water 12,00

Total 100,00

Table 10

Components Raw material names Contents (wt%) insecticidal active

fipronil 0,05 ingredient

binder hydrogen-added soybean oil 15,00 attractant fructose 100% 5,00

d-sorbitol 5,00 rice flour 51 ,25 rice bran flour 4,10 dry yeast balance peanut butter oil 0,5 flavoring agent

apple cider vinegar 3,00 stabilizer glycerin monostearate 1 ,00

sorbic acid 0,50 preservative

sorbate 1 ,50 vehicle water 5,30

Total 100,00

Table 1 1

Components Raw material names Contents (wt%)

Insecticidal active

fipronil 0,05 ingredient

Binder hydrogen-added soybean oil 20,30

high fructose corn syrup 29,50

Attractant oatmeal 36,85 dry yeast balance

Flavoring agent apple cider vinegar 3,00

Stabilizer glycerin monostearate 1 ,00 sorbic acid 0,50

Preservative

sorbate 0,50

Vehicle water 0,50

Total 100,00 In the above Comparative Examples 2 and 3 and the above Product Examples 2 and 3, the amount of an insecticide consumed by cockroaches was measured.

The experiment was conducted such that the consumed amount (i.e., the amount of insecticide eaten by cockroaches) of insecticide by German cockroaches was measured in the Comparative Examples 2 and 3 and the Product Examples 2 and 3 while other growth conditions and environments of cockroaches are made the same. The measurement results were showed in FIG. 1 (Comparative Example 2 and Product Example 2) and FIG. 2 (Comparative Example 3 and Product Example 3), respectively.

As shown in FIGs. 1 and 2, it could be found that the insecticide uptake rate was significantly higher in Product Examples 2 and 3 in which dry yeast is contained in the attractant than in Comparative Examples 2 and 3 in which dry yeast is not contained in the attractant, i.e., the insecticide uptake rate in Product Example 2 was about two times that in Comparative Example 2, and the insecticide uptake rate in Product Example 3 was about one and half times that in Comparative Example 3.

Example 4:

Example 4 was conducted in the same manner as the above Example 3 except that American cockroaches were used instead of German cockroaches. The results were listed in FIG. 3.

As shown in FIG. 3, American cockroaches showed a reduction in percentage of small weight loss (i.e., a low uptake rate) in Examples unlike German cockroaches, but the reduction is not determined as a remarkable difference over German cockroaches.

Therefore, it could be found that although other conditions are the same in case of using the dry yeast as the attractant according to the present invention, excellent cockroach attracting and insec- ticidal effect can be achieved.

Claims

1 . Use of an inactivated dry yeast for attracting cockroaches.

2. A poison bait-type insecticidal composition for attracting cockroaches, the composition comprising an inactivated dry yeast.

3. The poison bait-type insecticidal composition as cleimed in claim 2, characterized in that it comprises

an insecticidal active ingredient that kills cockroaches, preferably in an amount of 0,01 to 0,1 wt%, a flavoring agent to attract cockroaches, preferably in an amount of 1 to 10 wt%,

optionally a binder that binds the components of the composition, preferably in an amount of 10 to 25 wt%,

optionally a stabilizer, preferably in an amount of 0,1 to 2 wt%,

optionally a preservative, preferably in an amount of 0,1 to 5 wt%,

optionally a solvent that carries the components of the composition, preferably in an amount of 0,1 to 10 wt%,

and an attractant comprising the inactivated dry yeast the attractant, preferably being the balance of the composition,

wherein the weight percents are based on the total weight of the composition.

4. The poison bait-type insecticidal composition according to claim 3, wherein the insecticidal active ingredient is selected from the group consisting of fipronil, hydramethylnon, chlorpyrifos, propoxol, indoxacarb, boric acid, fenitrothion, and a mixture of two of more thereof.

5. The poison bait-type insecticidal composition according to any one of claims 3 to 4, wherein the attractant essentially comprising the inactivated dry yeast comprises in addition any one selected from the group consisting of fructose (100%), d-sorbitol, rice flour, rice bran flour, com flour oatmeal, high fructose corn syrup, and a mixture of two of more thereof.

6. The poison bait-type insecticidal composition according to any one of claims 3 to 5, wherein in the attractant essentially comprising the inactivated dry yeast, the inactivated dry yeast is contained in an amount of 5 to 10 % by weight based on the total weight of the composition.

7. The poison bait-type insecticidal composition according to any one of claims 3 to 6, wherein the flavoring agent is selected from the group consisting of peanut butter oil, apple cider vinegar, and a mixture of thereof.

8. The poison bait-type insecticidal composition according to any one of claims 3 to 7, wherein the binder is partially hydrogenated soybean oil.

9. A method for preparing a poison bait-type insecticidal composition for attracting cockroaches, the method comprising the steps of:

mixing, based on the total weight of the composition, a flavoring agent, preferably in an amount of 1 to 10 wt%,

optionally a binder, preferably in an amount of 10 to 25 wt%,

optionally a stabilizer, preferably in an amount of 0,1 to 2 wt%,

optionally a preservative, preferably in an amount of 0,1 to 5 wt%,

optionally a solvent, preferably in an amount of 0,1 to 10 wt%,

and an attractant comprising the inactivated dry yeast, the attractant preferably being the balance of the composition, thereby obtaining a mixture;

calcinating the mixture obtained in the mixing step at a temperature of 60 to 70°C, thereby forming a product in the shape of a cookie;

and adding an insecticidal active ingredient for killing cockroaches to the cookie product formed in the calcinating step, preferably in an amount of 0,01 to 0,1 wt%,

wherein the weight percent is based on the total weight of the composition.