白龙江林区狭冠网蝽生物学特性的研究

狭冠网蝽（Ｓｔｅｐｈａｎｉｔｉｓ ａｎｇｕｓｔａｔａ Ｂｕ．）在白龙江林区年发生１代，以卵在针叶组织内越冬。卵期１２３～１３１ｄ；若虫期２９～３２ｄ；雌虫寿命６０～７５ｄ，雄虫寿命５６～７２ｄ；雌雄性比接近１：２。本要为害粗枝云杉等云杉树种。若虫具群集、喜阴湿的习性。

Studies on biological characteristics of Stephanitis angustata Bu in the Bailong river forest region

In the Bailong river forest region, only one generation of Stephanitis angustata Bu arise every year. It is in the form of eggs hidden in the tissues of the needl-leave that the pest live in winter The periods of its egg and nymph respectively last 123 days to 131 days and 29 days to 32 days. The life-spans of its female and male body respectively are 60 days to 75 days and 56 days to 72 days. its sex proportion between female and male is nearly as one to two. The major tree species injured by the pest are some species of spruce such sa Picea asperata Mast and so on. Its nymphs are fond of lioing in a tight-knit community in shady and moist habitate.