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主梢顶芽枯死或失去是导致杈干的前提条件。本研究重点探讨了松梢象甲危害主梢的发生规律与条件，基本排除了人工林现阶段结实、冻害导致主梢顶芽凋萎枯死的可能性，并对不同类型杈干形成特征进行了研究，为人工红松杈干类型识别与控制提供了依据。
Main shoots buds dead or lost is the prerequisite for dry stems. In this study, we focused on the rules and conditions of the damage of the main shoots of Phyllischia mucronatus, and basically ruled out the possibility of firmness and withering of the apical buds of the shoots at the present stage of the plantation. The stem formation characteristics of different types of twigs were also studied Research, provide a basis for the identification and control of the type of dry red stem.