宁明县桐棉马尾松是受区内外欢迎的一种优良松树。1987年区森防站在检疫调查中发现大面积的桐棉松(马尾松桐棉种源)林产生了松针褐斑病,病原菌与国家规定的检疫对象lecanosticta acicola相似。为了了解该病害的情况,我们对林地进行了调查并从林区采回感病针叶进行分离培养和人工接种试验,现把结果报告如下: Ningming County Tong cotton Masson is a pine welcomed by the region and outside. In the quarantine survey in 1987, the district defense station found that a large area of ​​cottonwood (Pinus massoniana) forest had pine needle brown spot which was similar to the state-quarantined lecanosticta acicola. In order to understand the situation of the disease, we carried out a survey on the forest land and collected the infected leaves from the forest area for isolation, culture and artificial inoculation test. The results are reported as follows: