Soybean borer is an important pest in the pod blasting stage of soybean. It is harmed by larvae feeding on grains. The annual insectivory rate is 5% to 10%, and the severe insect feeding rate is as high as 50%. Damaged soybeans not only have reduced yield but also have deteriorated quality. Effective preventive measures should be taken promptly.
Prevention period. From 3 to 5 pm in the field, if there is a sudden increase in the number of moths in the field, there will be disturbances or flocking. This is the best period for prevention and control.
Prevention. Biological control: First, the release of Trichogramma, the general release of Trichogramma at the peak of the egg, releasing 20,000 to 30,000 heads per acre, can reduce the rate of insects about 40%. The second is the application of Beauveria bassiana (2.5 billion spores per gram). Before the larvae were dislocated, Beauveria bassiana was applied and 1.5 kg per mu was applied. Chemical control: First, fumigation with dichlorvos. Use 80% dichlorvos emulsifiable concentrate 100-150 ml per acre, select 2 sections long
Sorghum stalks or corn stalks, peel one part of the peony, and leave one part of the skin. After the dosage is to be absorbed, every 5 to 6 The ridge is inserted into a ridge, and each ridge is inserted at intervals of 5 to 6 meters and evenly inserted on the ridge. The second is a field spray. Use 12.5% of 2.5% deltamethrin EC per acre, 50 kg of water, or 5% of Fortune Chrysanthemum EC per acre, and spray 50 kg of water.
