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连续3年对梨小食心虫发生动态监测表明,兰州地区桃园梨小食心虫1年发生4代。越冬代成虫最早出现在3月底4月初。越冬代和第1~3代成虫高峰期分别出现在4月下旬、6月中旬、7月下旬和8月下旬。第3代成虫终于9月下旬。分析提出雄成虫发生高峰期后7 d以内为梨小食心虫化学防治的关键时期。总结提出了以农业防治为基础,物理防治、生物防治相结合,减少化学农药防治次数的综合防治技术。
Dynamic monitoring of pest occurrence in Pear for 3 consecutive years showed that 4 generations occur in Pear Moth in Lanzhou. Overwintering adult first appeared in early March at the end of April. Overwintering and first to third generation adult peak appeared in late April, mid-June, late July and late August. 3rd generation adults finally late in September. The key period for the chemical control of M. pears was proposed within 7 days after the peak of male adult. In conclusion, a comprehensive prevention and control technology based on agricultural control, combination of physical control and biological control, and reduction of the number of chemical pesticides was put forward.