油菜感染菌核病后,组织腐烂、营养物质转送受阻,病斑以上茎杆枯萎、籽粒干疵、粒重减轻、产量下降。本文就对菌核病引起油菜产量损失的估计方法进行了研究。1 病级测定法 在油菜成熟收获前,选有代表性的油菜田,按病害分级标准,每个病级(含健株为0级)取样20～30株,分级脱粒计产,计算各级平均单株产量(g/株),按下述公式计算各病级单株产量的损失率。 After sclerotinia sclerotiorum infection, the tissue decay, the transfer of nutrients was blocked, the stem above the lesion blight, grain defects, grain weight, yield decline. In this paper, the method of estimating the yield loss of sclerotinia sclerotiorum was studied. 1 Disease Determination Rape rape mature harvest before the election of a representative rape fields, according to the disease grading standards, each disease level (including healthy 0) sampling 20 to 30, thresholding production, calculate the level The average yield per plant (g / plant), according to the following formula to calculate the rate of loss of each yield per plant.