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The borer is an omnivorous pest that, in addition to rice, also harms cash crops such as corn and russet. In our region, 2-3 generations occur a year, and doing a good job in the prevention and control of a generation of borers can reduce the pressure on the prevention and control of rice by the second generation of borers.
I. Occurrence:
I stood at Dasheng, Dawan and other monitoring points to investigate. This year, the remnants of the giant borer in our region after winter are comparable to previous years, and it is expected that a generation of large borers will be moderately occurring, with a degree of occurrence of level 3 and an area of 20,000 mu. Since the beginning of spring, the temperature has risen rapidly and the temperature has been high, which has accelerated the development progress of the borer. Adult borers were first seen under the lights on April 1, compared with the same period last year, April 8, reaching the peak of feathering, one day earlier than last year, and the peak incubation period of large borer eggs in low altitude areas is expected to be mid-to-late April.
II. Prevention and Control Measures:
1. Prevention and control period
Areas below 400 meters above sea level are in mid-to-late April, and areas above 400 meters above sea level are from the end of April to early May.
2. Prevention and control agents
Spray bacillus thuringiensis (Bt) preparation at the end of the heart leaf, or spray with chlorhexabenzamide, thiamethoxam, tetrachlorofenamide, methylaminoavermectin benzoate and other agents, any of the above agents with water for routine spraying, or mix fine sand into poisonous soil, sprinkle into the new leaves of corn.
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