桑白蚧 (Ｐｓｅｕｄａｕｌａｃａｓｐｉｐｅｎｔａｇｏｎａ)是古田县、李、桃树上的重要害虫之一 ,常造成树势衰退 ,枝梢枯死 ,严重的整株死亡。果农因未掌握其发生规律 ,用药往往错过防治适期 ,药效很差 ,从而蒙受巨大经济损失。为此于 1 995- 2 0 0 1年在城关附近园取样 Pseudaulacaspipentagona is one of the most important pests on pomfret, plum and peach trees in Gutian County. It often leads to the decline of tree vigor, the withered branches and the serious death of whole plants. Because farmers have not mastered the law of their occurrence, medication often miss the appropriate period of prevention and treatment, poor efficacy, thus suffering huge economic losses. For this purpose, in 1995-2001, a sample was taken from the park near Chengguan