The use of a fumigant to prevent vegetable pests and diseases in greenhouses has the advantages of simple operation, convenience and safety, good efficacy, no increase in indoor humidity, low pesticide residues, and labor saving. However, if it is used improperly, there will be problems such as lowering of control efficiency or causing injury to medicines. Therefore, the following aspects should be noted when releasing the product:

Fumigation agent used for symptomatic use: 30% chlorothalonil smoke agent, can prevent fungal diseases of cucumber, tomato, leeks and other crops; 20% shed bacteria smoke agent, can prevent downy mildew, gray mold, leaf mold, early Diseases such as epidemics, late blight, epidemics, powdery mildew, anthrax, and scab, and 10% smoke-smoke-killing smoke agents can control aphids, greenhouse whitefly, spotted fly, and other insect pests; Prevention of red spider, two-leafhopper and other pests. If multiple pests and diseases occur, compound smoke agents can be used for prevention and control.

Control the dosage strictly: According to the size of the greenhouse, the effective content of the smoke agent and the different growth period of the vegetables, select the appropriate dose according to the principle of economy and efficiency. Such as the control of cucumber downy mildew, disease, tomato early blight, late blight, gray mold, etc., can choose 10% procymidone smoke agent, 250-300 grams per acre medication, the incidence of heavy doses of indoor medicine properly increased to 400 -500 grams, such as powdery mildew, 15% Ke Yanling smoke agent, 250-300 grams per mu. For the control of sclerotinia, 10% quick-cyanide smoke can be used, and 250-300 g per mu can be used. The amount of drugs used in the early stages of vegetable growth should be reduced as appropriate.

Reasonable timing of application: According to the characteristics of vegetable production in greenhouses, it is best to apply the aerosol agent after sunset in the evening. This is more conducive to the settlement of the mist particles of the smoke agent, and the control effect is more ideal. In the event of yin, rain, snow, the day can be carried out as usual.

Correctly grasp the method of spraying: The smoke agent should be multi-armed, and the distribution should be uniform. Use iron wire, bricks (bogey wood, bamboo sticks) as the support, and place the smoke agent 20-50 centimeters away from the ground. The sheds were ignited in order from the inside out, taking care to blow out the open flames and make them smoke normally. The shed film was then promptly sealed overnight. After ventilation the next morning, personnel were allowed to enter the shed for agricultural operations.

Determine the number of rational drug use: Prevention and treatment of disease should be applied at the early stage of disease, and only need to discharge 1 time to achieve control effect. In the middle and later stages of disease, it is generally used once every 7-10 days and used once every two to three times. If the pests and diseases are serious or the sealing performance of the booth is poor, the dosage may be increased or the application interval may be shortened.

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