桑白蚧寄生蜂资源考察及综合防治技术探讨

采用寄生昆虫调查法和寄生昆虫饲养法开展了考察桑白蚧寄生蜂资源,结果表明桃桑白蚧寄生性天敌—小蜂资源14种,均属于膜翅目小蜂总科,肯定了桑白蚧恩蚜小蜂为桑白蚧的优势种寄生蜂。该寄生蜂在河北昌黎1年发生6～7代,以老熟幼虫及蛹在桑白蚧雌虫体内越冬,5月上中旬开始羽化,羽化后,即行孤雌生殖,卵单产,寄主专一。田间自然寄生率为30%～70%,是控制桑白蚧发生危害的重要昆虫。并提出了以保护利用寄生蜂为主,合理使用化学药剂的综合防治技术。

Investigation of parasitic wasps of Pseudaulacaspic pentagon and their integrated preservation technology

Through investigation of parasitoid and adopting parasitoid, 14 species of wasps were found. All of them are parasitic natural enemies of Pseudaulacaspic pentagonaand Targioni-Tozzetti. They belong to Encarsia berlesei Hourard. E. berlesei Hourard has been the dominant parasitic natural enemy of the P. pentagona Targioni-Tozzetti. This wasp is polyvoline, the larvae and pupas parasitize in the female P. Pentagona Targioni-Tozzetti for over wintering. After emergence, parthenogeresis oviparity, confined to a single species of plant .The wasps' parasitic point in the nature is 30%-70%. E. berlesei Hourard is the dominant natural enemy of the P. pentagona Targioni-Tozzetti.