The prevention and control of rice pests and diseases in fishery rice fields must first emphasize biological control and give full play to the role of natural natural enemies, followed by pesticides. The specific operations for applying pesticides in fish farming rice fields are as follows: 1. According to the situation of rice diseases and insect pests, the fishes cultivated in paddy fields can act as natural enemies of rice pests and diseases. Therefore, fish farming rice fields can relax control indicators for certain pests and delay the control measures. Period, to reduce the number of prevention and control, reduce the area of ​​medication and reduce costs. 2. Use of high-efficiency, low-toxicity, low-residue pesticides: fish farming rice fields can not use pesticides that are highly virulent to fish. The best choice for water or oil is to choose porridge as little as possible. 3. Master the normal use of pesticides and the safe concentration of fish to prevent the death of fish poisoning caused by excessive application of pesticides. The commonly used pesticide dosage and the safe concentration of fish are shown in the following table: Pesticide name Conventional dosage (g/mu) (PPM) General dosage Maximum dosage Safety concentration 25% Insecticide water repellent 150 200 1.50 2% Insecticide drowning 50 100 1.0 90% trichlorfon crystal 75 100 2.0 40% Dimethoate 50 75 2.0 50% Methamidophos Emulsion 50 75 1.0 50% Xantia Pine 50 75 0.8 40% 4. Application of drug method should be appropriate 1 Before fish farming in paddy fields To deepen the field water, cover the field surface 7 to 10 cm; 2 the application of powder pesticides should be carried out in the morning when the dew is not dry, to prevent too much pesticide from falling into the water. Water and emulsion pesticides should be sprayed in the evening to reduce pesticide damage to fish. When spraying, it is recommended to finely spray, mist, and sprinkle the head upwards to sweep the water stem stems and leaves to reduce pesticides spilling into the water. Do not spray pesticides until it rains to prevent rainwater from rushing pesticides into the fields. 3 Fish farming should generally not use mixed soil to remove pesticides. 4 Give full play to the role of fish in rice fields and release the field water before application. , Let the fish enter the fish letter, and then apply pesticides, and then release the water into the field when the toxicity of the pesticide no longer has a major impact on the fish. 5 When pesticides are applied, the field inlet and outlet can be opened to allow the field water to change. Apply the pesticide from the outlet first, apply it to the middle of the field and stop it, so that the contaminated water will flow out, and then apply half of the field medicine to reduce Impact of pesticides on fish.
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