龙眼角颊木虱一年发生 4～ 7代 ,世代重叠 ,以 3～ 4龄若虫在被害叶片背面的虫孔内越冬。成虫在嫩梢、芽和叶上吸食为害 ,若虫固定于叶背吸食 ,引起叶肉细胞变形 ,叶片上呈现很多钉状突起 ,果农称为“生钉”。被害叶片变小 ,畸形扭曲 ,影响新梢的抽生和叶片的正常生长。同时 , Longan ciliate Psylla occurs 4 to 7 generations a year, overlapping generations, 3 to 4 instar nymphs in the back of the victim leaves in the winter hole. Adults in the shoots, shoots and leaves on the victim, nymphs fixed on the leaf back smoking, causing mesophyll cells deformity, the leaves showed a lot of spikes, fruit farmers as “raw nails.” Victims of smaller leaves, deformity distortion, affecting the shoots of the pumping and the normal growth of leaves. Simultaneously ,