Occurrence and Control of 3rd Generation Corn Borer First, occurrence and degree of harm It is expected that the 3rd generation of corn borer will be moderate to medium weight, and the 3rd generation will mainly damage the ear of summer maize and the heart, tassel and stem of autumn corn. If we do not do a good job of prevention and control, the rate of pests in the field will reach 40% or more. We will urge the majority of farmers to pay attention to it, and step up prevention and control to reduce damage. Second, the occurrence period and prevention period The 3rd generation of corn cocoon moths from August 8th to 15th, and egg hatching period from August 16th to 23rd. Period of prevention and control: August 22-25. Third, comprehensive prevention advice 1, the control of the field: summer corn, autumn corn. 2. Control agents and methods: 1 Autumn corn with 90% insecticidal single soluble powder 50 grams plus Bacillus thuringiensis (BT) 16000 IU/mg wettable powder 20 grams plus 70% imidacloprid wettable powder 1 g plus 15% triadimefon (triaden) wettable powder 100 g watered 100 kg thick flat head cover evenly sprayed in the heart and tassels. 2 Summer Ma with 90% insecticidal single soluble powder 50 g plus Bacillus thuringiensis (BT) 16000 IU/mg WP 20 g plus 5% Jinggangmycin powder 150 g Duishui 100 kg evenly sprayed on the ear and The upper and lower leaf sheaths and leaves of the temporal lobe. At the same time, it treats other pests such as Helicoverpa armigera, Myzus persicae, Mythimna separata, Aphids, Corn sheath blight, and corn rust. 3 Forbidding organic phosphorus and pyrethroid pesticides 20 days before harvest. (Hubei Dangyang Agriculture 110 Zhu Liqing)
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