梨九绵蚜的生物学研究

Biological study of Siciunguis novena Zhang et Hu

通过田间调查和人工接种，首次发现梨九绵蚜是在梨树根部为害的重要新害虫，并确定梨九绵蚜营异寄主全周期生活，其原生寄主为榆，次生寄主为梨。５ 月中旬至 ６ 月初，梨九绵蚜以有翅干雌成蚜迁飞到梨园，在梨树根梢产无翅孤雌侨蚜为害；１０ 月初至 １１ 月初，又以有翅性母成蚜迁飞到榆树上产雌、雄性蚜，交配后雌蚜产卵，以卵越冬；春季干母、无翅干雌、有翅干雌为害榆叶形成伪虫瘿。

The researchs based on field investigation and artificial inoculation. indicate for the first time that Siciunguis novena Zhang et Hu is an improtant and new insect enemy at the root of pear. Ets life history belongs to heteroceous holocycle type. Elm (Ulmus spp.) is its first host and pear ( Pyrus spp.) is ist second host. From the middle of May to the first of June alate fundatrigeniae fly and migrate to the pear as apterous viviparous female to damage the thin root of the pear. From the begining of October to the beginning of November sexuparae fly and migrate to the elm and produce the female and male Siciunguis novena . After mating the female lay eggs. Then the eggs hibernate. In spring the fundatrix, apterous fundatrigeniae and alate fundatrigeniae damage the leaves of the elm and produce pseudogalls.