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芦毒蛾(Laelia coenosa)是洞庭湖区获(Miscanthus sacchariflorus)和芦苇(Phragmitas communis)上的一种暴食性食叶害虫。危害很大,仅1980年发生面积近20万亩,严重时将叶片全部食光。近年来对其天敌进行比较系统的调查,发现粉质拟青霉(Pae—cilomyces farinosus)对幼虫和蛹的寄生率高,有利用前途。 苇田寄生率调查:1984年10月下旬,在沅江县的几个芦苇场作调查。被寄生的第二代蛹体粘附或悬挂于芦叶上,病原菌的分生孢子复盖于蛹茧表面,呈乳白至乳黄色。在200亩苇田范围内选择5点,每点调查200棵植株上的蛹体,害生率为36.8～66.7％。
Laelia coenosa is a binge leafhopper on the Miscanthus sacchariflorus and Phragmitas communis. Hazardous, only occurred in 1980 nearly 200000 acres of area, all the leaves in severe light. In recent years, its natural enemies were systematically investigated and found that parasitism of Pae-cilomyces farinosus on larvae and pupae was high and promising. Reed field parasitism survey: In late October 1984, a few reed fields in Yuanjiang County for investigation. Parasitic second-generation pupal body adhered or suspended on the leaf, the pathogen conidia covered pupa cocoon surface, milky white to milk yellow. In a 200-acre reed field, we selected 5 points and investigated the pupae on 200 plants at each spot, with a pest rate of 36.8% to 66.7%.