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云斑天牛危害核桃、板栗、梨、苹果和枇杷等多种果树,分布较广。鹤壁市山区种植核桃约20万株,近年由于云斑天牛的危害,造成大量死树。据张公堰等三个重点队的调查,平均受害株率达79％,严重危害核桃生产,南山大队林业队根据多年对云斑天牛发生规律的观察,进行了有效的防治,取得良好的效果,使新受害株率降低到0.8％,而未进行防治的大队,核桃新受害株率达21.8％。南山林业队的防治方法切实可行,他们的经
Cloud-day Beef endangered walnut, chestnut, pear, apple and loquat and other fruit trees, widely distributed. Hebi City, about 200,000 walnut trees planted in mountains in recent years due to the dangers of cloudy day beetles, resulting in a large number of dead trees. According to the investigation of the three key teams such as Zhanggongyan, the average affected strain rate reached 79%, seriously jeopardizing the production of walnut. Nanshan Brigade forestry team conducted effective prevention and treatment based on the observation of the occurrence regularity of Phasianus alternatus for many years Effect, so that the newly damaged plant rate reduced to 0.8%, but did not control the brigade, walnut newly damaged strain rate of 21.8%. Nanshan forestry team control methods feasible, their experience