When the amount of worms in the field reaches 1,000, it is necessary to spray drugs immediately. In the field with water, the medicinal agent can use 25% chlorpyrifos WP, 50 grams per acre and 40-45 kilograms of water. It should be sprayed on the habitat of the plant in the lower part of the plant to improve the control effect. It is best to keep a shallow layer of water in the field when applying the medicine. For the field without water, use 80% of the enemy's distressed emulsifiable concentrate, 300 ml of fine soil, 15-20 kg per acre, and apply once. In the case of dichlorvos mixed with poisonous soil and field application, it is necessary to wear gloves or plastic bags to mix and spread, to prevent poisoning through skin contact.
At present, the most suitable varieties are: è™± è™± çµ, dichlorvos, chlorpyrifos (Lesburn), and Regent. In specific applications, for more than 15 days from the harvest period, it is recommended to use chlorpyrifos and other agents for prevention and control; for less than 15 days from the harvest, close to the harvest, it is recommended to use dichlorvos, chlorpyrifos and other short-lived agents. Special attention should be paid to the use of chemical pesticides 7 days before harvest to prevent pesticide residues in rice.
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