根据作者在“国外松枯梢病综合防治技术研究”过程中的观察和调查，并参阅有关文献，将湿地松和火炬松枯梢病的发病症状归纳为三大类型：干枯型枯梢病、流脂型枯梢病和综合型枯梢病。并对各大类型枯梢病发生特点作简单阐述。 According to the author’s observation and investigation in the process of “research on the comprehensive prevention and control of pine blight in foreign countries”, and referring to the relevant literature, the symptom of the pine shoot disease of Pinus elliottii and Pinus taeda were summarized into three types: dry blight, Flow fat blight and integrated blight. The characteristics of each type of blight are briefly described.