摘要
蔬菜叶象甲［Ｌｉｓｔｒｏｄｅｒｅｓｃｏｓｔｉｒｏｓｔｒｉｓｔｏｂｌｉｑｕｕｓ（Ｋｌｕｇ）］在贵阳１年发生１代，以成虫于５月２０日左右滞育越夏，８月底开始取食，９月下旬开始产卵。成虫寿命长，一般在２５０天左右，最长的可达３２０天。产卵期一般约８０天，最长可达１４２天，一般在１２月中旬前结束产卵，少数成虫到第２年２月中旬前亦可产少量卵。每头雌虫可产卵５００粒左右，孤雌生殖，１０月中旬至１１月中旬为成虫产卵盛期，卵量可占７８％左右，卵多散产在土表，少数产在叶背或心叶内。成虫及幼虫只发现取食十字花科植物，喜食少腊质品种，在背光处取食叶片、叶柄、心叶、花蕾，老、嫩叶片均可取食。幼虫四龄。各种虫态均可休眠越冬。
Listroderes costirostris obliquus occurs one generation in year in Guiyang.Its adults enter summer diapause on about May 20th, begin to eat in late August and lay eggs in late September. The adults have a long longevity for 250 days generally.the longest longevity can last 320 days. The oviposition poriod is 80 days generally,the longest one can be 142 days Generally the adults finish ovipositing before mid December, a few of them can lay a few eggs before mid February in the following year. Female adults conduct parthenogenesis. Each one can lay abeut 500 eggs. The oviposition peak appears from mid October to mid November and the eggs laid in this period account for 78% of total number.Most eggs are laid on the earth surface separately, and a few are on the back of leaves or in middle leaves. The adults and larvae are only found to feed on the plants of mustard family, and like eating low wax varieties. In a poor light place they can eat leaves (old or tender), leafstalks, heart leaves and flower buds. The larvae bave four stadia. Each instar can lie dormant while wintering. A full-grown larva dig into the earth and form a chamber to pupate.
