论文部分内容阅读
数年的广泛调查结果表明 ,板栗疫病在浙江发生普遍 ,但危害轻度的地方多 ,严重的地方少。危害稍重和严重的地方 ,多半是由于管理差 ,其他病虫弱枝多 ,特别是板栗吉丁虫危害重等原因诱发的。接种观察的结果是无伤接菌的发病率为 0 ,轻伤接种 (削皮接 )的发病率为 2 0 %,重伤接种 (撬皮接 )的发病率 1 0 0 %,1a之后 ,发病株死亡率为 33%和 80 %,表明栗疫菌对无伤或轻伤的板栗枝干难以侵染 ,对有较重伤口的板栗枝干则能造成较大危害。在浙江杭州地区 ,板栗疫病的过冬病斑 ,2月下旬即开始扩展 ,4～ 6月扩展较快 ,7月以后扩展缓慢。表 2参 4
Extensive investigations over the years have shown that chestnut blight is common in Zhejiang but less harmful and less serious. Mostly due to poor management and other pests and weaker branches, especially those caused by the serious damage of the chestnut and the jejuni. The results of the inoculation observation were that the incidence of non-invasive bacteria was 0, the incidence of minor wound vaccination (peeing) was 20%, the incidence of serious wound inoculation (pricking skin) was 100%, and after 1 year The mortality rate of strains was 33% and 80% respectively, which showed that Chestnut blight could not infect chestnut branches without injury or slight injury, and chestnut branches with heavier wounds could cause greater harm. In Hangzhou, Zhejiang Province, chestnut blight winter lesions, began to expand in late February, 4 to 6 months to expand faster, after July, the slow expansion. Table 2 Participation 4