CS258918B1 - Insecticidal agent for controlling ants - Google Patents

Abstract

The subject of the solution is an insecticidal agent for the control of ants, especially Monomorium pharaonis L. pddle Čsl. AO 206 960. The solution uses some new findings and improves the composition of the mixture of which the agent consists. Dried egg yolks are used as protein components instead of boiled egg yolks, rye, barley, corn or wheat flour, or semolina, or breadcrumbs are also used as carbohydrate components and 0.01-2% 2,6-di- -t-butyl-p-cresol is used as a stabilizer, or the active substance is used without a stabilizer.

Description

The invention relates to an insecticidal composition for controlling ants, in particular Monomorium pharaonis I. ants.

Czech patent application AO 206 906 describes the preparation of an insecticidal composition for the control of ants, in particular Monomorium pharaonis. The present invention utilizes some new knowledge that was obtained through further research and addresses some of the disadvantages of the original, above-cited invention.

The subject of the invention is an insecticidal agent for the control of ants, especially Monomorium pharaonis, the essence of which is that the protein component consists of dried egg yolk in an amount of 30-75% by weight, the carbohydrate component is rye, barley, corn, or wheat flour, or semolina, breadcrumbs, or crushed rusks in an amount of 20-35% by weight. This mixture either does not contain any stabilizer of the active substance - juvenoid, or 2,6-di-t-butyl-p-cresol is used as a stabilizer of the active substance - juvenoid in an amount of 0.01 - 2% by weight of juvenoid. Ju.ver.oid can be mixed into the mixture without using a solvent.

The boiled egg yolks used in the original invention for the preparation of the bait are difficult to prepare in large quantities and are difficult to handle. The present invention overcomes this disadvantage by using industrially produced dried egg yolks for the preparation of the bait.

According to the original invention, ground diet biscuits can be used as the carbohydrate components of the bait. It has now been found that rye, barley, corn or wheat flour, or semolina, or breadcrumbs can also be used advantageously as the carbohydrate components of the bait. This eliminates the need to grind the carbohydrate component.

According to the original invention, tocopherol is used as a stabilizer of the active substance - juvenoid. It was found that 2,6-di-t-butyl-p-cresol in an amount of 0.01-2% has a better stabilizing ability and that ants willingly accept the bait stabilized with it. It was further found that the desired result can also be achieved with a bait without a stabilizer, i.e. extermination of ants in a given location, and that juvenoid can be introduced into the bait without the use of a solvent.

The kinetics of the decomposition of juvenoid methoprene (A), methoprene with 2% tocopherol (B) and methoprene with 1% 2,6-di-t-butyl-p-cresol (C) are shown in Table 1. The numbers indicate * decomposition substances.

Table 1

Time 14 days 1 month 2 months 7 months A 5 15-20 4 0—60 B 2 10-15 30-40 C 0 0 0 footprints

The beneficial effect of 2,6-di-t-butyl-p-cresol as a stabilizer on bait intake by Monomorium pharaonis ants is evident from the comparison of the consumption of 2 bait variants B - (without stabilizer) and S - (with stabilizer) in 24 hours on 9 consecutive days, as shown in Table 2. Observed in a breeding aquarium containing 20-50 females and 2,000-3,000 workers. Expressed in .

B = 100% on each monitored day.

Table

Day

B

WITH

1 2 3 4 5 6 7 8 9 average 100 100 100 100 100 100 100 100 100 100 107 123 183 135 124 105 164 165 110 135

Table 3 presents the summary results of field trials with two bait variants B - (without stabilizer) and S - (with stabilizer 2,6-di-t-butyl-p-cresol). They show that bait S has higher biological effectiveness, but that bait B can also be used for remediation, i.e. extermination of ants in a given location.

Table 3

Bait

Ί. Number of assessed sites

2. Total floor area of the sections

3. Percentage of positive traps before remediation begins, average range

4. Number of workers per positive trap before sanitation average range

5. Progress of sanitation 60th day average number of workers per positive trap % of localities with ants 100th day average number of workers per positive trap % of localities without ants 150th day average number of workers per positive trap % of localities without ants

B

162,752 ^m2 700-48,340 ^m2

64.8% 30-100%

104.1

20-278

25.8 5%

10.2 35%

100

The invention is explained in more detail below.

WITH

227,290 m ² 1,000-92,951 m ² % 9-100%

140.3

24-425

26.5

11.7%

4.1

58.8 %

100 examples of embodiments, without being limited thereby.

Example 1

A mixture of dried egg yolks (400 g), ground diet biscuits sieved through a 0.1 mm sieve (300 g) and honey (200 g) is homogenized. Then the consistency of the mixture is checked.

If it does not meet the requirements, the necessary ingredient (crackers or honey) is added in the amount necessary to achieve the desired consistency, i.e. so that the finished bait is soft, cohesive and slightly crumbly. Then a solution of methoprene (4.5 g) and 2,6-di-t-butyl-p-cresol (10 mg) in acetone (50 ml) is added to the mixture and the mixture is mixed thoroughly again. Then the acetone is allowed to evaporate from the mixture by spreading it on a flat dish with occasional stirring, which takes about 2 hours.

Example 2

A mixture of dried egg yolks (400 g), wheat flour (300 g) and honey (200 g) is homogenized. The procedure described in Example 1 is then followed.

Example3

A mixture of dried egg yolks (400 g), honey (200 g), methoprene (4.5 g) and 2,6-di-t-butyl-p-cresol (10 mg) is thoroughly mixed. Ground dietary biscuits (300 g) sieved through a 0.1 mm sieve are added to the resulting paste. After thorough homogenization, a bait is obtained, the consistency of which usually does not need to be adjusted as described in example 1.

Example 4

A mixture of dried egg yolks (400 g), honey (200 g) and methoprene (4.5 g) is mixed.

Ground dietary biscuits (300 g) sieved through a 0.1 mm sieve are added to the resulting paste and the mixture is thoroughly homogenized. The resulting bait usually has the desired consistency and does not need to be adjusted in the manner described in example 1.

Claims (2)

An insecticidal composition for controlling ants, in particular Monoroorium pharaonis, comprising a mixture of the active ingredient - juvenoid in an amount of up to 1% by weight of the mixture, further proteinaceous components of carbohydrate and honey, or molasses as binder components of the mixture 30% wt. % of the composition, characterized in that the protein component of the mixture is dried egg yolk in an amount of 30 to 75% by weight, a carbohydrate component of rye, barley, corn, or wheat flour, 2. The ant insecticide composition of claim 1, further comprising 2,6-di-t-butyl-p-cresol in an amount of 0.01 to 2% by weight of the juvenoid.