论文部分内容阅读
研究了梨小食心虫在无锡桃园的发生规律、越冬地点,测定了不同代老熟幼虫的过冷却点和冰点。结果表明,梨小食心虫在无锡地区的年发生代数与温度有关,年发生5~6代。春季温度较低,越冬代成虫发生较整齐,年发生5代;如早春温度偏高,则第1代发生期提前,造成严重世代重叠,年发生6代。每年高发期在7—8月,后期世代重叠严重。梨小食心虫老熟幼虫的过冷却点和冰点随代数增加而上升,越冬代老熟幼虫过冷却点在1年所有世代中最高,平均达-10℃,可以在江苏无锡地区越冬,越冬地点在树皮翘缝下、老树皮下、枝条锯断处。田间采集幼虫自然羽化率为24%,幼虫的田间被寄生率最高可达57.89%,认为田间保护利用天敌可以对梨小食心虫起到较好控制效果。
The occurrence regularity and overwintering spot of Peach mungbean in Wuxi Taoyuan were studied, and the supercooling point and freezing point of mature larvae of different generations were measured. The results showed that the annual occurrence of pest mites in Wuxi was related to the temperature, with 5 to 6 generations occurring annually. The spring temperature is relatively low, overwintering on behalf of adults more neat, occurred in 5 generations; such as high temperature in early spring, then the first generation occurred in advance, resulting in serious overlapping generations, 6 generations occur. High incidence in each year in July-August, the latter generation of serious overlap. The overcooling point and freezing point of the larvae of mature pears larvae increased with the increase of algebra. The overcooling points of mature larvae overwintering were the highest in all generations in one year, with an average of -10 ℃. They could win in winter in Wuxi, Jiangsu Province. Bark Alice seam, the old tree bark, branches sawing Department. The natural emergence rate of larvae collected in the field was 24%. The parasitism rate of the larvae reached 57.89% in the field. It was considered that the protection and utilization of natural enemies in field could play a good control effect on the pests.