大青山地区油松枯梢病发生规律研究

Study on Tip Blight of Pinus tabulaeformis Carr. in Daqing Mountains

对内蒙古大青山阳坡油松枯梢病的发生规律进行了研究,结果表明:油松枯梢病病原菌为松球壳孢菌。油松枯梢病各个发生阶段症状明显,每年5~6月,油松枝条自下部、外部向上部、中部逐渐枯黄,少数针叶尖端枯死变灰或针叶段枯死。8月下旬,枝干皮下生长子实体、分生孢子器,10月中下旬,分生孢子器成熟后突破寄主表皮而外露。油松枯梢病的发病与立地条件有一定关系。

Abstract：Based on the study on occurrence regularity of tip blight of Pinus tabulaeformis Carr. in sunny slope of Daqing Mountains in Inner Mongolia, the results show that the pathogen is Sphaeropsis sapinea （Fr.） Dyko ＆ Sut- ton. There are significant symptoms of tip blight of Pinus tabulaeformis Carr. in different period. In May and June,the branches of Pinus tabulaeformis Cart. turn yellow from the lower and external part to the upper and central part, the tip of a few needle leaves die and turn grey. In last ten - day of August, fruit body and pycnidium grow. In middle to late October, pycnidium ripe and exert from the epidermal of host. There is a regular relation between tip blight of Pinus tabulaeformis Carr. and site condition.