陕西商洛市核桃苗期地下害虫种类及为害情况调查

The Investigation of Underground Detructive Insects' Variety During The Seedling Stage of walnut in Shangluo City

核桃苗期地下害虫是影响优良核桃苗木生产的主要因素之一.经调查发现:（1）核桃苗地地下害虫主要类群为金龟叩头虫甲（chckchafers and skipjacks）;（2）核桃苗地下害虫在商洛全区普遍发生并逐年加重;（3）地下害虫多,为害加重的主要原因是育苗连作,未腐熟农家肥的施用和防治不力.

The insects which hide underground are one of the main reasons to affect the growth of walnut seedlings during seedling stage. Resarch shows that:(1) the main destructive insects are chekchafers and skipiacks; (2)this disease is common in Shangluo City and become much worse one year after another; (3)the main reasons of the disease are continuous seedling cropping, the use of improper farm manure ,and the inefficient prevention and care.