高粱条螟在湘北地区的发生动态

用越冬幼虫及其后代研究了高粱条螟Procerasvenosatus (Walker)的年生活史和未成熟的发育分级特征。结果表明 :卵、幼虫、蛹分级分龄选用的特征比较明显、稳定 ;高粱条螟在湘北地区为兼性滞育昆虫 ,幼虫既能以滞育方式越冬、越夏 ,也能以滞育方式越冬连越夏或者越夏连越冬 ,每年发生 1～ 2代 ;各虫态历期为 :成虫产卵前期 2～ 3d ,卵期 7～ 1 0d ;1龄幼虫期 2～ 3d,2龄 6～ 7d ,3龄 5～ 7d,4龄 9～ 1 1d ,5龄 8～ 1 0d ,6龄 1 1～ 1 2d ,蛹期 9～ 1 1d。

Bionomics of Proceras venosatus in northern part of Hunan Province

The morphological characteristics and bionomics of overwintering larvae of Proceras venosatus and the following offspring were studied. The characteristics of egg, larva, and pupa in different age were described. P. venosatus is an insect species with facultative diapause. By diapause they overwinter and oversummer. One or two generations occur each year in northern Hunan. The pre oviposition period of female adults is 2～3 d; the larva has six instars, each instar from the first to the sixth lasts 2～3, 6～7, 5～7, 9～11, 8～10, and 11～12 d respectively; the pupal stage is about 9～11 d.