在大灰象甲发生较多的地区,新植果树常常遭到大灰象甲的严重为害。一九八七年春季,我们在青龙满族自治县北坎村果园进行了调查,对果园内新植苹果幼树,随机选取了两行(三十二棵),几乎每棵苗木都受到为害,其中大灰象甲发生最多的每株达二十八头,最少的每株二头,平均每株幼树八头。大灰象甲主要分布在树上及树下距树干三十厘米半径内的土隙中。主要危害苗木幼芽、叶,危害严重的有二分之一的 In areas where the greater Asclepius occurs more often, new plantations of fruit trees are often severely damaged by Asclepias australis. In the spring of 1987, we conducted a survey in the orchards of Beikan Village, Qinglong Manchu Autonomous County. We randomly selected two rows (32 trees) of newly planted young apple trees in the orchard and harmed almost every seedling. Among them, Elephas maximus occurs at a maximum of twenty-eight heads per plant, with a minimum of two heads per plant and an average of eight heads per plant. A gray askew mainly distributed in the tree and the tree within a radius of thirty centimeters within the soil gap. The main endangered seedlings shoots, leaves, one-half of serious harm