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洋县汉王山林场位于秦岭南麓浅山丘陵地区,总面积6.4万多亩。从1960年建场到1983年底,全场80%以上的荒山荒坡已绿化成林,其中侧柏纯林面积达4700多亩(10年生以上的幼林占80%,10年生以下的幼树占20%)。1980年前侧柏幼林生长良好,1981年冬,在两角山工区樟绵湾发现侧柏叶枯病,轻者枝叶失绿发黄,重者枝叶枯死。1982年春即发展到500多亩,1983年5月又蔓延到1000多亩。而以海拔600～950米之间最为严重。当年冬整个侧柏林均有感染,感病率达90%以上,枯死率也随之剧增,严重地影响了侧柏林的正常生长发育。目前,侧柏叶枯病国内外尚未见有报道资料可资借鉴。为了摸清该病的发生发展规
Yangxian Hanwangshan Forest Farm is located in the Qinling Mountains foothills hills, with a total area of 64,000 mu. From the establishment in 1960 to the end of 1983, more than 80% of the barren hills and slopes of the audience have become afforested forests, of which the arborvitae pure forest covers an area of 4,700 mu (80% of young trees over 10 years old, less than 10 years old 20%). Before 1980, Platycladus orientalis young forest grew well. In winter 1981, Platycladus orientalis leaf blight was found in Zhangmian bay of Liangjiao mountain work area. In the spring of 1982, it developed to 500 mu and in May 1983 it spread to more than 1,000 mu. And the most serious between 600 to 950 meters above sea level. In the winter, the whole Platycladus orientalis was infected with the infection rate of more than 90%, the mortality rate also increased sharply, seriously affecting the normal growth and development of the Platycladus orientalis. At present, there are no reported data available for reference to oriental leaf blight at home and abroad. In order to find out the occurrence and development of the disease rules