桑蓝萤叶甲的形态及生物学特性研究

STUDIES ON THE MORPHOLOGY AND BIOLOGICAL CHARACTERISTICS OF PHYLLOBROTICA ARMATA BALY

采用大田调查和室内尼龙纱笼、玻璃缸饲养等方法,对桑蓝萤叶甲的形态、生物学特性等进行了研究。结果表明,在诸暨地区桑蓝萤叶甲一年发生一代,2月下旬至4月上旬为蛹期,3月—5月下旬为成虫期,4月—6月下旬为卵期,5月—9月下旬为幼虫生长活动期,10月以后为越冬幼虫休眠期。各虫态发生不整齐。幼虫经3个龄期老熟,钻入深土层筑土室越冬,并化蛹其中。成虫喜食嫩叶,具有假死习性;在原桑地分散产卵,完成生活史。在稀植、管理粗放的桑园中,一般虫口密度较高。

The morphology and biological characteristics of Phyllobrotica(Fleutiauxia)armata Baly were studied by the field investigation and artificial rearing with nylon cages and glass jars et al. The results showed that in Zhuji area Phyllobrotica armata Baly only had F1 each year. Its pupal stage was from late February to early April, adult stage from March to late May,ova stage from April to late June and development stage from May to late September. The larvae kept hibernating after October. So its morphology didn't ap-pear uniformly. The larvae became mature after three stages,then hibernated and pupated in the earth. The matured liked eating fresh leaves and had the habit to pretend to be dead. They dispersed to lay eggs in the mulberry field and then completed their life cycle. The density was fairly high especially in the mulberry fields without control.