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桑虎天牛为害桑树,幼虫蛀食韧皮部及木质部,形成宽大的隧道,严重影响营养和水分的传导。为害较轻时,桑叶小而薄,为害严重时,则整个桑株枯死。 在辽宁省,此虫需1—2年完成一个世代,以幼虫越冬。 幼虫在木质部蛀食的孔即成虫羽化后爬虫的通道。剪、锯桑树引起的坏死组织为幼虫的正常生长发育提供了必要的条件,非此不能完成其正常的生活周期。 提出下列防治意见:(1)浸透80％DDVP乳油10倍液的棉球将幼虫蛀食孔堵死,可杀死木质部内的幼虫、蛹和成虫:(2)刀、锥等可杀死部分幼虫;(3)锯割、修剪等机械伤口可涂以沥青或其他涂料,以阻止雌虫产卵;(4)成虫出孔前,烧掉枯死桑树;(5)引入并保护啄木鸟。
Mulberry mulberry damage mulberry, larvae eroded phloem and xylem, forming a large tunnel, seriously affecting the nutrition and water conduction. Damage lighter, mulberry leaves small and thin, serious damage, then the entire mulberry dead. In Liaoning Province, this worm takes 1-2 years to complete a generation, with larvae overwintering. The larvae eaten in the xylem holes that adult insects after the reptile channel. Necrotic tissues caused by scissors and saw mulberry provide the necessary conditions for the normal growth and development of the larvae, without which the normal life cycle can not be completed. Proposed the following control advice: (1) soaked 80% DDVP EC 10 times the cotton ball larvae bore holes can kill larvae, pupae and adults within the xylem: (2) knife, cone and other kill part Larvae; (3) sawing, pruning and other mechanical wounds can be painted with asphalt or other paints to prevent the females from laying eggs; (4) adult borers burn out the dead mulberries; (5) the introduction and protection of woodpeckers.