由松色二孢菌(Diplodia pinia(Desm.)Kickx)引起的松梢枯病在我国广东省首次发现。已知分布地区有广州近郊,新会县圭峰山,肇庆鼎湖山,清远县艮盏林场,病害有继续扩展蔓延之势。马尾松梢枯病的主要症状有梢枯、嫩梢弯曲、溃疡、流脂、叶枯,甚至全株死亡。病原菌的特征是分生孢子双胞,褐色,大小为28.5～39.9×14—24微米(图1、2)。松色二孢菌能侵染马尾松、湿地松、加勒比松和火炬松。病原菌在受病的针叶、枝 Shoot blight caused by Diplodia pinia (Desm.) Kickx was first detected in Guangdong Province, China. Known distribution areas in Guangzhou suburbs, Xinhui County, Gui Fengshan, Zhaoqing Dinghushan, Qingyuan County Gen light forest, the disease has continued to spread the trend. The main symptoms of Pinus massoniana Blight are shoot dry, tender shoots, ulcers, fats, leaf blight, and even whole plant death. Pathogenic bacteria are characterized by twin conidia, brown, size 28.5 ~ 39.9 × 14-24 microns (Figure 1,2). Pinus sylvestris can infect Pinus massoniana, Pinus elliottii, Caribbean pine and loblolly pine. Pathogen in sick coniferous, branches