论文部分内容阅读
长江中下游梨黑星病病菌多于病芽鳞片内越冬,从芽萌动至鳞片脱落是初侵染的主要时期。至5月中旬(前期)的病叶率与上年7月的降雨量呈极显著的正相关(r=0.9765,n=16),从而建立直线回归方程(?)=-3.575+0.0586X,以此方程依据7月的降雨量(X)预测次年前期的病叶率((?))。因此,花序露出期喷洒铲除剂和花期雨后(尤其流行年份)及花谢80％喷洒保护剂是控制前期发病与全年为害的关键。
Middle and lower reaches of the Yangtze River pear powdery mildew pathogenic bacteria in the winter than the scales within the bud, bud sprouting to scale shedding is the main period of the initial infection. There was a significant positive correlation between the disease leaf rate and the rainfall in July last year (r = 0.9765, n = 16), and the linear regression equation (-) = -3.575 + 0.0586X was established by mid- This equation predicts the rate of diseased leaves in the second year from the July rainfall (X). Therefore, the spruce revetment spray period and flowering after the rain (especially popular year) and spend 80% spraying protective agent is to control the incidence of early and full year the key to damage.