Relationship betweenValsa sordidaand abnormal coldness in spring
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摘要:对辽宁省1997－2010年倒春寒分为轻度、中度偏轻、中度和重度等4级，并对不同等级倒春寒与辽宁省杨树烂皮病Valsa sordida发病的关系进行了分析。结果表明：倒春寒与杨树烂皮病年发生总面积呈正相关（P＜0.05），与中、重度发病面积呈正相关（P＜0.01），与轻度发病面积关系未达到显著水平（P＞0.05）；与轻度病害所占比率呈负相关（P＜0.01），与中、重度病害所占比率呈正相关（P＜0.01）。倒春寒发生越严重的年份，相应的杨树烂皮病发病面积越大。倒春寒发生程度越重，中、重度病害发生的面积和比率增加越明显。表4参10Abstract:Abnormal coldness in spring from 1997 to 2010 in Liaoning was classified into four levels of low-grade，secondary-grade，third-grade and serious in this paper. The relationship between the incidence of Valsa sordida and the different level of abnormal coldness in spring was also analyzed. The results showed that there was positive correlation between the total area of disease and abnormal coldness in spring （P＜0.05），the same positive correlation with the moderate and serious disease area （P＜0.01），and no significant level was achieved with the mild disease area （P＞0.05）. There was negative correlation between abnormal coldness in spring and the mild disease incidence rate （P＜0.01） and positive correlation with the moderate and severe disease incidence rate （P＜0.01）. The year of severe abnormal coldness in spring matched with large acreage disease incidence of Valsa sordida and the more severe the coldness，the more obviously the acreage and incidence of moderate and serious disease increased. ［Ch，4 tab. 10 ref.］
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https://zlxb.zafu.edu.cn/article/doi/10.11833/j.issn.2095-0756.2011.06.015
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