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油松(Pinus tabulaefofmis Carr.)林分遭受日本松干蚧(Matsucoccus matsumurae Kuwana)(以下简称松干蚧)为害后,侧枝下垂,甚者树干弯曲而倒伏.依据其
After Pinus tabulaefofmis Carr. Is damaged by Matsucoccus matsumurae Kuwana (hereinafter referred to as Pinus tabulaeformis), its branches drooped and its trunk bent and lumbered, according to which