SU488527A1 - Insectoacaricide - Google Patents

Description

(54) INSECTOACARICID

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Insecticidal and acaricidal effects of new compounds were studied in laboratory and field experiments.

Laboratory tested and. We studied the contact insecticidal effect of compounds on five test objects: rice weevil, common beet weevil, Colorado beetle, house flies (limago), and cereal aphids using the method of toxication of Petri dishes.

0.5 ml of an acetone solution of the test substance of a certain concentration is uniformly applied over a certain area (1 dm). After evaporation of the solvent, experimental insects are placed in the cups and food is placed. The cups are covered with gauze and kept in a thermostat at an air temperature of 22-26 C and a relative humidity of 70-80%. The repetition is experimentally triple.

The acaricidal activity of the systemic action is studied on a spider mite.

Example 1. The object is a rice weevil.

The experiments used a crop of rice weevil, which develops year-round in the laboratory.

The benchmark in the experiment is chlorophos,

0 control - option without the use of insecticides.

The insecticidal effect of the compounds is determined by one, two and three

5 days after setting the experience. Data on the activity of compounds in rice weevil (average of three replications) are given in Table. 2

table 2

From the data obtained, it is clear that N-substituted 2-K-4-dialkoxyphosphonyl-5-aminooxaeols have a high insecticidal activity, according to oxHOUJenie, for rice weevil, which is significantly superior to the chlorophos standard. An important property of new compounds is the rapid manifestation of their activity. So, after a day with the consumption of the active substance 1.25 mg / dm, they caused 85-100%

death of weevils, in variants of experience using chlorophos death of weevils 34%.

Example 2. The object is an ordinary beet weevil.

In the experiment, not yet fed weevil beetles were used; standard - polychlorinated. The activity of the compounds is determined on the third and fifth day after the test, the results are presented in Table. 3

Table 3.

As can be seen from the presented data, the new compounds are not inferior to the standard of polychloropinene or are approaching it in terms of the effect on beetles of an ordinary beet weevil.

Example 3., Object - Colorado potato beetle.

The test results of the new compounds in the Colorado potato beetle 13

50

95

Continuing taip. four

10 9. 488527 Continuation of table 4

Pb The obtained data (Table 4) indicate a high activity of the N Compound Experimental data (Table 5) indicate the high toxicity of N-substituted 2-E-4 dialkoxyphosphonyl-5-aminooxazoles for cereal aphid. The three studied compounds (1.5 and 11) slightly exceeded the standard by action, while the rest approached it.

The death of flies,%, at an expense

The compound of the active substance, mg / DM 5

4. Object - cereal

Example 10

The insecticidal action of the compounds is studied on female aphid, cultivated year-round on young wheat plants. The activity of the compounds is determined in 20-22 s after setting the experiment. The test results are presented in Table. five.

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TablideB

The death of aphids,%, with the consumption of the active substance, mg / dm2 -substituted 2-K-4-dialkoxyphosphonyl-5-aminooxaeol relative to the Colorado potato beetle. Of these, compounds 1.5 and 10 are of the greatest interest, which in their activity are not inferior to polychlorinated and whose action appears much faster than the standard. Example. 5. Object - room. The experiments were carried out in laboratory culture of flies in the adult stage at the age of three to four days. A deist- outside connections for flies is determined through 50. 22-24 h after setting the experiment, the results are presented in table. 6. Table b

As can be seen from the data obtained (Table 6), M-substituted 2-K-4-dialkoxyphosphonyl-5-amipooxazoles exhibit rather high activity with respect to room flies, not yielding to the standard of chlorophos or approaching it in action.

Example 6, Object - spider mite.

The experiments were carried out in greenhouse conditions on bean plants that are in the phase of one pair of leaves using the following procedure.

The upper side of the leaves of the beans are treated with acetone solutions of the studied substances in various concentrations. Female spider mites are placed on the lower side of the leaves 2 hours after the treatment of the plants. The activity of the compounds is determined every two days after setting the experiment. .Reference; - BI-58. The results are presented in table. 7

The efficacy of 2-ethyl-diethoxyphosphonyl-5-dimethylaminooxazole D to combat beet aphid at the production plantings of beet testes is determined. The size of the division is 10 m. Beet seedlings infected with beet aphid are sprayed with a hand hydropult with a flow rate of the working liquid of 500 l / ha. Standard - BI-58, control - option without treatment with insecticides. Compound efficacy is determined by reducing the average plant population of aphids on 2, 4, 7, and 9 days after spraying relative to their initial population (before spraying) and is expressed as a percentage.

The studies of the effectiveness of the compounds were carried out throughout the experiment on model plants that were always allocated for this purpose. The results are presented in the table. eight.

 T a b l and c a 8