我省很多地区核桃树年年出现干枝,群众叫回梢、干梢、焦梢等等。为什么核桃枝条会干枯呢?有人说是受冻,有人说是干旱,也有人说是病虫害,还有人认为树老了必然有死枝,是自然交替。究竟是什么原因?近两年来我们在核桃病虫害防治研究工作时进行了观察。据在商洛、宝鸡地区调查,核桃枯枝到处可见,但不同地区枯枝原因并非完全一致。不过,大部分地区都是由于核桃小吉丁虫的危害而造成的。如丹凤、商县、 In many parts of our province walnut trees appear dry branches every year, the masses called back tip, stem tip, co-shoot and so on. Why walnut branches will dry it? Some people say that it is frozen, some say it is arid, others say it is pests and diseases, and others think that there must be dead branches in trees, which are natural alternations. What is the reason? In the past two years, we conducted research on walnut pest control research. According to the survey conducted in Shangluo and Baoji, walnut litter can be seen everywhere, but the reason for the litter in different areas is not exactly the same. However, most of the area is due to the damage caused by the small jelly bug. Such as Danfeng, Shangxian,