摘要
通过典型调查和统计分析,油菜千粒重随着菌核病病级的增加而下降,产量损失率随着茎病株率、病情指数的增加而加大。在此基础上建立了千粒重与病情指数、产量损失率与最终病情指数、产量损失率与最终茎病株率回归方程。根据当地近3年油菜平均产量水平、市场价格等推算经济危害允许水平(EIL),确定油菜菌核病的化防指标为中等偏轻以下发生年不需防治、中等发生年份防治1次、中等偏重以上发生年份防治2次。
Through typical investigation and statistic analysis, the results indicated that the 1000-grain weight decreased with the increase of disease level; yield loss rate increased when the stem disease rate and the disease index increased. Based on the results, three regression equations （the regression equation of 1000-grain weight and disease index; the regression equation of yield loss rate and ultimate disease index; the regression equation of yield loss rate and ultimate stem disease rate） were formed. The chemical control index of S.sclerotiorum （S.selerotiorum should not be controlled if it occurred less than mediumly; and should be controlled only once if it occurred mediumly; and should be controlled twice if occurred more than mediumly） were ascertained by EIL, which is caculated by average yield for nearly 3 years, market price and etc.
出处
《河北农业科学》
2008年第6期27-28,31,共3页
Journal of Hebei Agricultural Sciences
关键词
油菜菌核病
千粒重
产量损失率
病情指数
茎病株率
EIL
防治指标
Sclerotinia sclerotiorum
1 000-grain weight
Yield loss rate
Disease index
Stem disease rate
EIL
Control index
