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梨大蚜是梨枝干上的一种重要害虫。四川已知有20多个县市有分布。该虫为全周期种类。以卵密集于梨树枝上越冬。翌年2月中旬开始孵化,若虫经四龄,以孤雌胎生方式繁殖,于雌若蚜三龄时,翅芽明显,并于4月下旬—5月上旬羽化为有翅干雌迁飞到夏寄主卧龙柳上(发生代数不详)。到9月下旬—10月上旬又由有翅性母迁回到梨枝上,以胎生方式繁殖,雄若蚜三龄时,翅茅明显,羽化后与雌蚜交配,产卵于枝上越冬。已发现该虫捕食性天敌4种,寄生性天敌2种。经室内、外药效试验表明:40%氧化乐果、80%敌敌畏乳油(1;1000倍液),10%除虫精乳油(1:500倍液);2.5%溴氰菊酯乳油(5—10)ppm 喷雾,均有较好的防治效果。
Pear aphid is a pest on the trunk of an important pest. More than 20 counties and cities in Sichuan are known to have distribution. The worm is a full-cycle species. Overwintering on pear branches with eggs. In mid-February of the following year hatching, nymphs by age four, parthenogenesis viviparous manner, in the third instar of female sexual aphids, wing buds obvious, and in late April - early May, feathering into a winged female migration to summer Wolong host on the host (occurrence of algebra unknown). To late September - early October by a winged mother moved back to the pear branch to viviparous way to reproduce, male if the third instar aphid, wing Mao obviously, emergence and mating with female aphids, spawning on the branches of the winter. Four insect predators and two parasitic natural enemies have been found. The indoor and external drug efficacy tests showed that: 40% omethoate, 80% dichlorvos EC (1; 1000 times), 10% deoxone emulsifiable concentrate (1: 500 times); 2.5% deltamethrin EC -10) ppm spray, have better control effect.