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1974年至1975年初,我们在广东省平原丘陵地区,进行了杉木病害的观察和防治试验。一、病原分析 1.主梢或侧梢顶部退绿,颜色由橙黄至红褐色,严重株梢头干枯下垂,轻病株则梢头未完全枯死,生长季节又抽出细小顶芽,成长的针叶细小质硬,整枝新梢至节下一段枯褐色,针叶上病斑边缘明显,在潮湿天气或在保湿培养后,出现粉红色的分生孢子堆,经镜检或组织分离,多见毛盘孢菌(Colletotrichum sp),称炭疽病。 2.树冠基部针叶枯黄,由针叶尖端开始逐渐扩展至整片针叶以至整个冠基侧
From 1974 to the beginning of 1975, we conducted experiments on the observation and control of Chinese fir in the hilly plain of Guangdong Province. First, the pathogen analysis 1. The top of the shoot or side shoots back to the top of the green, the color from yellow to reddish brown, severe plant shoot dry head drooping, light plant is not completely dead shoots, growing season and out of small buds, the growth of small needle Hard, prickly branches to a section of section under the dry brown, stains on the edge of the needle obvious, in wet weather or after moisturizing culture, pink conidia pile, microscopic examination or tissue separation, more common fur Colletotrichum sp, called anthrax. 2 canopy base yellowish yellow, starting from the tip of the needle gradually expanded to the entire needle and even the whole coronary crown side