赤松毛虫在辽宁省主要分布于辽南及辽西，与落叶松毛虫和油松毛虫混合发生，辽东、辽北等地虽有分布但数量较少，为油松、赤松、黑松及樟子松的主要害虫之一。本文利用多年累积的观察资料，对其幼虫的龄期、取食量、蛹重与产卵量的关系、卵的孵化规律等生物学特性进行了较详细地报道，为进一步深入研究及制定防治决策，提供科学依据。 Caterpillar of Dendrolimus spectabilis mainly distributed in Liaonan and Liaoxi in Liaoning Province, which mixed with Dendrolimus tabulaeformis and Dendrolimus tabulaeformis. Although there were some distributions in Liaodong and Liao Bei but less in quantity, Pinus tabulaeformis was Pinus tabulaeformis, Pinus koraiensis, Pinus thunbergii and Pinus sylvestris One of the major pests. In this paper, the accumulated observations over many years, the larval age, feeding amount, the relationship between pupal weight and fecundity, egg hatching and other biological characteristics were reported in more detail, in order to further study and formulate prevention and treatment Decision-making, to provide a scientific basis.