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双条杉天牛 Semanotusbifasciatus Motschulsky主要以幼虫蛀食树干韧皮部、形成层和木质部危害 ,未蛀入木质部内的初龄幼虫期是防治的有利时机 ,根施呋喃丹杀虫效果可达 85 .1 9%。
Semanotus bifasciatus Motschulsky mainly infects the phloem, cambium and xylem in the larvae. The first instar larvae without decay in the xylem are a good time to prevent and control, and the insecticidal effect of fenfluosin can reach 85.119 %.