长足象Mecysolobus erro(鞘翅目:象虫科)的生物学与生态学研究

Biological and ecological studies of longleg weevil, Mecysolobus erro (Coleoptera: Cueculionidae)

长足象（Ｍｅｃｙｓｏｌｏｂｕｓｅｒｏ）对大叶醉鱼草（ＢｕｄｄｌｅｊａｄａｖｉｄｉＦｒ．）的生长有一定的抑制作用，是一种很有潜力的天敌。研究结果表明：长足象在南京地区一年发生２～３代，以成虫在植株下部枯枝落叶或表土中越冬，越冬代危害期在５月上中旬～７月上中旬；第一代危害期在７月中上旬～８月上旬；第二代危害期在９月上中旬～１０上中旬。盛夏高温，日平均气温２９℃以上，可引起该虫的生殖滞育。

Longleg weevil, M. erro is a potential agent for the biological control of Buddleja davidii Fr.. Biological and ecological studies showed that the insect has 23 generations annually in Nanjing and adults overwinter under dealbranches and leaves or in soil. The damages caused by overwintered, first and second generations were observed from early May to midJuly, early July to early August and early September to midOctober, respectively. High temperature in summer (daily average temperature higher than 29 ℃) induces reproductive diapause in adults of the insect.