中文摘要：

采用笼罩法研究了朝鲜球坚蚧对8种寄主的选择性及其与寄主枝条物理结构、寄主和蚧体内化学物质间的关系。结果表明，朝鲜球坚蚧对8种寄主的取食和产卵的选择性差异均达极显著水平，由强到弱依次为桃、梅、李、杏、苹果、梨、樱桃和山楂，且分成桃、梅、李、杏，苹果、梨、樱桃，以及山楂3个寄主层次。取食和产卵选择性-致，分别与8种寄主的表皮毛密度、长度、皮层厚度、枝条直径、黄酮以及单宁等间达极显著负相关，相关系数r分别为-0．9413～-0．8816和-0．9624～-0．8943；同时分别与8种寄主的可溶性糖、蛋白质、游离氨基酸、含水量、CarE、AChE、GSTs和蚧体可溶性蛋白质等间达极显著正相关，r分别为0．9025～0．9413和0．8937～0．9201。以取食表皮较为光滑、表皮毛稀疏、长度短、皮层薄、寄主可溶性蛋白质、游离氨基酸和含水量多、含黄酮和单宁少的桃、梅、李和杏等寄主的蚧体内CarE、AChE、GSTs的活性和可溶性蛋白质含量较高，对寄主选择性较强；取食苹果、梨和樱桃的次之；取食山楂的最低。

英文摘要：

The relationships among the selectivity of Didesmococcus koreanus Borchs, branch physical structure and chemical substance in the eight host plants and D. koreanus were studied by using net covered means. It provide basis for to conducted ecological pest regulation and management by insect-resistant varieties. The results showed that the feeding-selectivity and oviposition-selectivity of D. koreanus to eight host plants all were significantly different, and orders of these selectivities were peach, plum, cherry plum, apricot, apple, pear, cherry and hawthorn. And these hosts were divided into three groups, the most favorite hosts were peach, plum, cherry plum and apricot, the favorite hosts were apple, pear and cherry, the inferior favorite host was hawthorn. Feeding-selectivity and oviposistion-selectivity of D. koreanus with the eight host plants of the hairs density, length, epidermis thickness, branch diameter, flavones and tannin, and all reached a very significant negative correlation, and their correlated coefficients r respectively were - 0.9413 to - 0. 8816 and - 0. 9624 to - 0. 8943. The same reasoning, feeding-selectivity and oviposition-selectivity of D. koreanus with the eight host plants of branch＇s soluble sugar, host plant＇ ssoluble protein, free amino acids, water content, CarE, ACHE, GSTs and the insect＇ s soluble protein content, and all reached a very significant positive correlation, and their correlated coefficients r respectively were 0. 9025 to 0.9413 and 0.8937 to 0.9201. Feeding-selectivity and oviposition-selectivity of D. koreanus are consistent on the eight host plants. Activity of CarE, ACHE, GSTs and the soluble protein content of D. koreanus that feeding peach, plum, cherry plum and apricot which branches relatively smooth surface, low hair density, length short, thin epidermis, more content of host＇ s soluble proteins, free amino acids, water content, and low content flavones and tannins were relatively high. The D. koreanus of the host plant＇ s selectivity strong is ser