苹果绵蚜的迁移与扩散

The move and dispersal of woolly apple aphid (homomptera:aphididae) in Zhaotong apple orchards

当温度约8℃时,苹果绵蚜若虫就开始迁移活动.3月中下旬苹果花开(结果)后,若虫就能迁入花蕊内,且各时期均能迁入花(果)定殖为害;无翅孤雌蚜全年有3个迁移活动高峰期,分别在3月下旬~4月下旬,6月下旬~7月上旬和11月上旬~12月下旬;苹果绵蚜在1 d的迁移高峰期在12~14时,随温度的升高,其活动速度和迁移虫量加快;有翅蚜在昭通市有2个发生期,分别为夏季(5月中旬~6月下旬)和秋季(8月下旬~10月上旬).夏季有翅孤雌蚜只能产孤雌蚜,且量少,秋季产生有翅蚜的虫量多,且可产性蚜和孤雌蚜.

The woolly apple aphid nymphs begin move and migrate when the temperature is about 8 ℃.After apple tree flower(or fruit) and at tree anydevelopment stage,the nymphs can migrate into the flower(or fruit).The nymphs hold three peak stages in a year,the end of March to the end of April,the end of June to the beginning of July and the beginning of November to the end of December.The migration peak stage of the nymphs is at 12—14 clock in adaylight.The movement rate and number is increasing,with the growth of te...