CS225039B1 - The insecticide and akaricide agents - Google Patents

Description

(54) Insecticidal and acaricidal products

The invention relates to insecticidal and acaricidal compositions for the protection of agricultural crops against animal pests based on O-alkyl-S-chloromethyl-N-alkylamidothiophosphates.

O, O-dialkyl-S-chloromethyl esters of (thio) -dithiophosphoric acid of the general formula I are known from the literature as soil insecticides.

R (O) n r 'o

PY-CH 2 -Cl ² X (I) (US Pat. 3 896 219; Ger. Pat. 1 015 794), of which 0,0-diethyl S-chloromethyldithiophosphate (chlormephos, Dotane) is used in practice, ( U.S. Pat. No. 536,070).

It has been found that S-chloromethyl-O-alkyl-N-alkylamidothiophobates of the general formula XI r'o 'PS-CH ₂ -C1 (II) r ² nh'

Wherein R and R are the same or different alkyl with 1 insecticides and acaricides.

1-4 carbon atoms are effective as

The insecticidal and acaridal compositions of the present invention may be formulated as emulsifiable concentrates, dust concentrates, dusts, wettable powders, granular formulations and the like.

The following examples illustrate but do not limit the scope of the invention.

The activity of the compounds of the invention on wireworms (Elateridae larvae) was monitored according to the following procedure:

The soil into which the experiment was based was first dried, sieved and adjusted to the desired structure. The soil thus prepared was weighed in increments of 200 g per concentration. The weighed soil was poured into a two-liter duster along with a precisely weighed preparation. The powder was sealed and the contents were stirred for 5 minutes on a mechanical mixer. The prepared soil was poured into rollers (height 12 cm, diameter 5 cm), inside of which were reinforced with a plastic foil, the bottom part of the plastic foil was attached to the roller using a nylon fabric and fastened with a rubber band. The treated roller was placed down on Petri ml - nylon fabric. Fifteen wire rods were placed in each roller and the surface was poured with 10 ml of water. In order to prevent cannibalism between the individual chickens, 3 corn seeds were added to each roller. The rollers were then placed in a room at both 22 ° C and 2 ° C with appropriate relative humidity. Each concentration was done with 6 replicates. Every two days 10 ml of water was poured into each roller. After 8 days, the experiment was evaluated by counting the dead cervix. From three replicates, the average percentage of dead cervix was calculated. Chlormephos was used as a standard. The results are shown in Tab. First

compound concentration ppm effectiveness % c ₂ h ₅ o 24 100 PS - CH - C1 II ² 2 80 t-c ₃ h ₇ nh ' 0 6 80 ^ 2 * - ^S · 0 -ch ₂ -ci 24 100 12 00 chlormephos - št. 6 100

Determination of contact afficidal effect on Aphis fabae by immersion method.

Workflow:

33 aphids of a homogeneous population were placed in a 4 cm diameter gauze-coated bottom and covered with a Petri dish. The treated substance was applied by dipping the aphids (3 x 3 s), the concentrations used being graduated according to the geometric order of 1.2. After application, the aphids were dried on filter paper. After drying and the cylinders with the voamam, they were placed in petri dishes in which a filter paper ring was inserted. Controls are untreated aphids. Standard chlormephos was used for comparison. The results are shown in Tab. Second

Table 2

of Compounds

ED ₅₀ in PPm c ₂ h ₅ o ic ₃ h _? nh

PS - CH - C1 II ² O

0.0057 chlormephos - št

0,063

Determination of acaridic effect in females Tetranychus urticae Koch.

Workflow:

Bean plants were placed in Erlenmayer tap water flasks. A square area of 2.5 cm side was delimited on the sheet with a non-drying adhesive. 30 pieces / square were transferred from the breeding to the square using a fine brush. The treatment was done by immersing the plant in the treated compound using concentrations graduated according to the geometric order of 1.2. After immersion, the plants were stored in a tempered room (24 ° C) with a relative humidity of 60-90%. Controls were untreated females. Standard chlormephos was used for comparison. The results are shown in Tab. Third

Table 3

compound ED ₅₀ V ppm ^C 2 ^H 5 ° C ₃ H ₇ NH PS - CH - C1 'II ² 0 0.00054 chlormephos - No. 0.0020

The test compound can be prepared, for example, by the method of the author's certificate

Claims (1)

OBJECT OF THE INVENTION Insecticidal and acaricidal compositions for the protection of agricultural crops against animal pests, characterized in that they contain, as active ingredient, 3-chloromethyl-O-alkyl-N-alkylamidothiophosphate of the formula XI r'o r ² nh P-S-CH - C1 II ² o Wherein R and R are the same or different alkyl having 1 to 4 carbon atoms.