Ptilinus fuscus is distributed in 46 counties of 8 regions in Gansu Province.It seriously damages poplar.This insect has one generation every two years depending on elevation and climate.The adult emerges from May to July in Kangle County and from June to July in Weiyuan County.The larvae hibernate from October to March of next year,and damage trees from April to September,especially in April and May.The larva has 7 instars:the pupal period is from May to July.The emergence lasts 21 days on average continuously.Brushing the timber 3 times with mothproof liquid can poison the larva,and the controlling effects can reach 95%.Brushing the mothproof protective membrane can completely inhibit the adult insect from attack the timber.
