危害川麦冬蛴螬的田间鉴别与分布特征

危害川麦冬蛴螬的防治提供依据,对四川绵阳川麦冬的主产区地下害虫蛴螬进行田间调查和鉴定。危害川麦冬的蛴螬优势种是灰胸突鳃金龟Hoplosternus incanus、暗黑鳃金龟Ho-lotrichia paraullela、铜绿丽金龟Anomala corpulenta和苹绿异丽金龟A.sieversi.它们在麦冬田间形成优势种群,灰胸突鳃金龟H.incanus与其他三种在田间形成共优势种群。在温暖季节,幼虫主要在表层0-20 cm分布,在寒冷冬季越冬;幼虫转入地下20-40 cm的区域越冬。在虫卵孵化后,虫口密度达到高峰。该研究为防治麦冬地下害虫蛴螬提供了理论基础,并可促进麦冬栽培的可持续发展。

Distribution Characteristics and Identification of White Grubs Endangering the Growth of Ophiopogen japonicus

The research aimed to provide a scientific basis for prevention and control of the damage done to Ophiopogen japonicus by white grubs. The white grubs of Ophiopogen japonicus in Mianyang area of Sichuan prov- ince were studied by field investigation. The white grubs endange-ring the growth of O. japonicus were mainly Hoplosternus incanus , Holotrichina paraullela , Anornala corpulenta , and A. sieversi , Which could form Dominant populations respectively, and H. incanus and other species may form co-dominant populations in fields of O. ja- ponicus. The vertical distributions of white grubs in the depths of 60 cm from ground to underground had some difference, in which the distributions of white grubs in the depths of underground 0 - 20 cm was obviously more than that in the other areas during warm seasons, and white grubs mainly distributed in the depths of under- ground 20 -40 cm in winter. The research provided theoretical foundation for controlling the white grubs of O. japonicus and could promote the sustainable development of O. japonicu cultivation.