A class of pesticides used to control harmful nematodes. The nematode belongs to the linear phylum of the genus Nematode, which is small in shape and can be observed under the microscope. There are about 3,000 species of nematodes harmful to plants, most of which live in the soil, and some are parasitic in plants. Nematodes spread through soil or seeds, can destroy the roots of plants, or invade the organs of the aboveground parts, affect the growth and development of crops, and indirectly spread the diseases caused by other microorganisms, causing great economic losses. What are the nematicides? The classification of the nematicides by the pesticide network is as follows: Classified by chemical 1. Halogenated hydrocarbons are low-boiling gas or liquid fumigants that are applied in the soil to cause nematode anesthesia. After the application, it is necessary to go through a safe interval and then plant the crop. The application of such medicaments is large, and special soil syringes are used. The application is rather cumbersome. Some varieties such as dibromochloropropane have been banned due to toxicity and have been gradually eliminated. 2. Isothiocyanates are soil fungicides that can be decomposed into methyl isothiocyanate in soil. They can be applied as powders, liquids or granules to inactivate certain sulfhydryl enzymes in nematodes and cause poisoning. . 3. Some varieties of organophosphorus and carbamate have a nematicidal action and are applied in the soil, mainly for contact action. Nematicides account for a small percentage of pesticides, but they are important. Classified by use One type is an obligate nematicide, that is, a pesticide that is only active against nematodes at the concentration used; the other is a genital nematicide that is active against most organisms in the soil at the concentration used. Pesticide. Classified according to the mode of action , Nematicides can be classified into fumigant nematicides and nonfumigant nematicides. Our common nematicides are Medan and Aldicarb.
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What are the nematicides?