牛洪福同志:根据你信中描写的形态特征,我认为是桑白介壳虫。它主要为害核果类果树,如桃、杏、李等。以若虫及雌成虫群集固定在枝条上吸食养分,严重时,整个枝条被此虫覆盖,并重叠成层,远看好似涂了一层灰白色蜡质物。被害技条不能正常生长,极大地影响了果树的花芽形成、开花结果,产量锐减。 Comrade Niu Hongfu: According to the morphological features described in your letter, I think it is a mulberry white scale insects. It is mainly harmful to stone fruit trees, such as peach, apricot, plum and so on. To nymphs and female adults clustered fixed on the branches to take nutrients, serious, the entire branches covered by the insects, and overlap into layers, looks like a long coat of gray waxy material. Injured skills can not grow normally, greatly affected the flower bud formation of fruit trees, flowering results, production dropped sharply.