First, the occurrence and degree of harm: It is expected that the third generation of corn borer will produce moderate to moderate weight loss, and the third generation will mainly damage the ear of summer maize and the heart, tassel and stem of autumn corn. It is estimated that the accumulated egg volume in the 3rd generation of the field will reach 1500 or more, and the rate of insects will reach 30% or more, and the rate of individual insects in the field will reach 40%. The farmers are urged to prevent and control the loss of damage.
Second, the occurrence period and prevention period:
1st and 3rd generations of corn borer adulthood 7/25-8/10th, egg hatching period 8/1-20 days.
2. The control period is 8/1-8 days and 8/13-20 days respectively.
Third, comprehensive defense advice:
1, the control of the field: summer corn, autumn corn.
2. Prevention of pharmacy and methods: Mu with powdered milk 50g plus barriers 90ml plus helium eliminating 2 bags of water diluted 100 pounds of coarse point flat head cap sprayed on autumn corn, upper leaves, heart leaves and tassels; summer corn sprayed on On the ear and its loquat leaves, concurrent treatment of peach aphid, cotton bollworm, armyworm and aphids and other pests.
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