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咸丰县国营坪坝营林场的杉木人工林分布在海拔1100-1700米.气候特点是夏凉冬寒,潮湿多雨,年平均气温9.3℃,相对湿度85%,年降雨量约2000毫米,寒冷期160天左右,雨日占50%.杉木发生黄叶病已有十多年.面积达3000余亩.经多年防治,累积了经验,取得了一些效果.历年防治面积2000亩,病情未继续发展,而略有好转的1500亩.现对坪坝营林场杉木黄叶病的致病原因,提出一些看法.
The plantation of Chinese fir plantation in Pingba Forest Farm of Xianfeng County is distributed in the altitude of 1100-1700 meters above sea level. The climate is cold in summer and cold in summer, wet and rainy. The annual average temperature is 9.3 ℃ and the relative humidity is 85%. The annual rainfall is about 2000mm and the cold period is about 160 days , Rain accounted for 50% of the yellow leaf disease has been fir for more than 10 years. An area of 3,000 acres. After years of prevention and control, accumulated experience and achieved some results over the years prevention and treatment area of 2000 mu, the disease did not continue to develop, and slightly There is a turnaround of 1,500 acres.Currently Pingbaying forest Fir yellow leaf disease causes, put forward some views.