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由松壳色单隔孢(Diplodia pinea(Desm.)Kickx)引起的马尾松梢枯病在我国广东省首次发现。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孢,褐色,大小为28.5～39.9×14～17微米。松壳色单隔孢能侵染马尾松(Pinus massoniana)、湿地松(P.elliotii)、加勒比松(P.caribaea)和火炬松(P.taeda)。病原菌在受病的针叶、枝条和球果上越冬。每年3～5月第一次发病,7～8月第二次发病。当年生嫩梢未老化之前,病原菌能从伤口侵入或从嫩叶、嫩梢直接侵入。嫩梢老化以后,只能从伤口侵入。在自然条件下,病害主要发生在嫩梢伸长的后期,很少发生在嫩梢伸长的前期。在病树枯枝、枯叶上,松壳色单隔孢和多毛孢菌(Pestalotia sp.)之间存在生存竞争的关系,经接种试验证明后者对马尾松没有侵染能力,可利用它进行生物防治的研究。
Masson pine blight caused by Diplodia pinea (Desm.) Kickx was first detected in Guangdong Province, China. 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 conidia spore, brown, the size of 28.5 ~ 39.9 × 14 ~ 17 microns. Pinus massoniana can infect Pinus massoniana, P. elliotii, P. caribaea and P. taeda. Pathogens overwinter on sick needles, branches and cones. March to May each year the first incidence, 7 to August the second incidence. Before the young shoots are not aging, the pathogen can invade from the wound or from the young leaves, young shoots directly invade. Tender aging, only from the wound invade. In natural conditions, the disease occurs mainly in the late tip of young shoots, rarely occurs in the early stage of young shoot elongation. In the diseased tree branches, dead leaves, Monkshood and Pestalotia spores (Pestalotia sp.) Competition exists between the survival of the vaccination test proved that the latter does not have invasive capacity of the massoniana, it can be used Conduct biological control research.