DD161048A1 - MEANS FOR THE CONTROL OF NEMATODES, DIPLOPODES AND CRUSTACEES - Google Patents

Abstract

The invention relates to agents for the control of nematodes, diplopods and crustaceans; as active ingredients they contain O-methyl-S-methyl-phosphoramidothioate.

Description

VEB OHlMISSOMBINAa? BITTERJSID Bitterfeld, 22.-2. 1978

1936 WP A 01 N / 203 833

Agent for controlling nematodes, diplopods and crustaceans

Field of application of the invention

The invention can be used in agriculture and horticulture for the control of Sehaderregern.

Characteristic of the known technical solutions

It is known that the active ingredient methamidophos for controlling insects and mites in a variety of agricultural crops is used (DD-PS 56 967).

It is also known that in the context of the further intensification of agriculture and horticulture also pests of other systematic categories in the complex of harmful species are becoming increasingly important. These include, for example, nematodes, diplopods and economically less significant some representatives of isopods.

Nematodes are pests of a variety of cultural and ornamental plants.

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Among the diplopods, members of the Blaniulidae and Julidae families are becoming more and more important as pests, and their polyphagia infests a variety of crops, particularly beet and vegetable crops, most of which are in the seedling stage.

Isopods can be harmful to greenhouse crops by eating softer parts of plants. The active ingredients dimethoate or lindane hitherto used to combat these pests are known to have a number of shortcomings.

Object of the invention

The aim of the invention is to develop a means of controlling nematodes, diplopods and crustaceans.

Explanation of the essence of the invention

This object is achieved in accordance with the invention by the fact that the agents for controlling fematodes, diplopods and grustaceae contain customary auxiliaries and additives as the active ingredient O-methyl-S-methylphosphoramidothioate. The active ingredient can be formulated in a manner known per se. Liquid preparations preferably contain 10 to 80% by weight, solid formulations 2 to 20% by weight of the active ingredient; the combination with other pesticides or pesticides is possible.

Execution b e i e Example 1;

The nematicidal activity was demonstrated both in the spray process and in the casting process in the control of Aphelenchoides ritzemabosi (Schwartz). For this purpose, infected leaves were placed on healthy chrysanthemum plants of a susceptible variety. The up-migration of the nematodes was by placing the potted plants in a humid chamber

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favored. After successful infection and the formation of the first symptoms of malignancy, a two-time application of a 50% emulsion concentrate based on Meth.amidophos was carried out at intervals of 5 days. The application concentration was 0.1% of the preparation. As a comparison, served a 40% emulsion concentrate based on dimethoate in 0.1% concentration. In the spraying process, the plants were sprayed dripping wet, in the casting process 100 cur spray mixture per plant were applied. Seven days after the last application no nematodes could be detected with methamidophosan application in both variants, while nematodes were still occasionally detected in the dimethoate-treated plants after application of the casting method as well as the spraying method.

Example 2;

The effectiveness of Meth.amidopn.os over diplopods was tested in a Cucumis sativus L. greenhouse. As a pathogen, the spotted millipede (Blaniulus guttulatus Gerv.) On. The application of the agent according to the invention was carried out by injection and in the bait method. In the Sprita process, a 50% emulsion concentrate in 0.1% concentration was used. The reference agent used was a 12% emulsion concentrate based on lindane in an application concentration of 0.4%. The application took place in the morning hours, since at this time the majority of the pests were on the surface of the culture substrate. The bait method was tested in order to avoid contamination of the plant with the active ingredient in the greenhouse. The bait was a mixture of equal parts of wheat bran and sugar with a proportion of 0.5% methamidophos or lindane. The bait was moistened with 35 ml of water per kilogram and laid out frequently in the evening. Forty-eight hours after the application of the emulsion concentrates and the baits, the counting of the surviving animals was carried out in both methodological variants. In comparison to the pre-count of the infestation, a reduction of the population in the application of the agent according to the invention in the spray process of 97 »6%, in the bait method

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of 95j8%. The corresponding values for lindane were 85.3 % and 56.7%, respectively.

Simultaneous attack by the plant-damaging ballassass (Armadillidium vulgare B.-L.) in the attempt to test the spraying procedure against B, guttulatus was reduced by 99.3% through the use of methamidophos by 94- »8% by lindane.

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Claims (1)

- 5 - 1936 Claim: Agent for combating hematodes, diplopods and crustaceans, characterized in that they contain, in addition to customary auxiliaries and additives, as the active ingredient O-methyl-S-methyl-phosphoramidothioate. Dr. Sch / 1 IP Ml \! 1 η ι Π> ^