梨小食心虫生物学特性观察及防治试验

Biological Characteristics Observation and Prevention Test of Grapholitha Molesta(Busck)

利用梨小食心虫性信息素监测,掌握了该虫在梨园的发生动态。结果表明:该虫在梨园1年发生4代,越冬代成虫始见期为4月初,各代的成虫羽化高峰期分别为5月下旬、6月下旬至7月上旬、8月中下旬和9月上中旬;运用期距法推算其最佳防治适期,选用25%灭幼脲Ⅲ号、1.2%苦烟乳油等4种农药进行了田间防治试验,以除虫脲对梨小食心虫防治效果最好,适合大面积推广应用。

Occurrence dynamics of Grapholitha molesta（Busck ） in pear orchards was mastered by monitoring its sex pheromone.The results showed that it occurred 4 generations one year,the adults of the overwintering generation emerged in early April ,the peak of adult hatching in every generation appeared respectively in late May, from late June to early July, on last twenty-day of August, and first twenty-day of September.In addition, the best optimum control stage was calculated by using the periodic distance method ,four pesticides such as 25% diflubenzuron No.3 and 1.2% Ku. Yan EC were experimented in the field trial, it was concluded that diflubenzuron was the best pesticide to prevent Grapholitha molesta （Busck）, and was suitable for large-scale popularization and application.