栎长颈卷叶象的生物学特性

Bionomics of Paracycnotrachelus longiceps Motschulsky

栎长颈卷叶象Paracycnotrachelus longiceps Motschulsky危害柞树嫩叶,在丹东1 a发生2代,以成虫在枯枝落叶层下、表土中越冬。越冬成虫翌年5月初出蜇,终见日出现在7月初。一个叶苞内产卵1粒,偶见2粒。卵期10～15 d,幼虫期11～16 d,蛹期3～5 d。第1代成虫出现于6月下旬至8月下旬,第2代成虫始见于8月中旬9,月中旬到10月上旬进入越冬状态。

Paracycnotrachelus longiceps Motschulsky attacks tender leaves of oak tree.It has 2 generations a year and overwinters as adult in litter in Dandong,Liaoning Province.The overwintering adult emerges between the beginning of May and the early July the next year.The adult lays one egg per bud,occasionally two eggs.The stages of egg,larva and pupa last 10-15 d,11-16 d and 3-5 d respectively.The adult of the 1st generation emerges between late June and late August.The adult of the 2nd generation begins to emerge in mid August and overwinter from mid September to early October.