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油松林分遭受日本松干蚧(简称松干蚧)为害后,植株个体间的表型特征差异很大。可以依据侧枝下垂、主干弯曲等受害症状,明显地划分为4个等级,其具体划分标准见“油松对日本松干蚧的抗性与树木生长的关系”(《辽宁林业科技》1988.1)。松干蚧以很小的虫体,寄生于油松等寄主枝干的皮缝中,靠口针刺入韧皮内部,吸收营养。以3龄枝段的寄生数量最多。一年2代,每年4月下旬至6月上旬,7月下旬至9月上旬两次显露。
Pinus tabulaeformis sinensis suffer from Japan pine dry scale (referred to as pine dry scale) damage, the phenotypic characteristics of individuals vary widely. It can be clearly divided into four grades according to the symptom such as collateral drooping and trunk bending. The specific criteria for the classification can be found in the relation between the resistance of Pinus tabulaeformis and the growth of tree in Japan (Liaoning Forestry Science and Technology, 1988.1). Matsubara to a small insect body, parasitic in Pinus tabulaeformis and other host branch of the stitching, piercing the phloem inside needle to absorb nutrients. To 3-year-old branches of the largest number of parasites. Two generations a year, from the end of April each year to early June, late July to early September twice revealed.