【摘要】 本文在红三叶白粉(Erysiphe Polygoni DC.)病情田间调查的基础上,分析了发病率、严重度、病情指数与产量损失之间线性关系,并由此建立了红三叶白粉病防治的经济阈值模型。这一模型可为当地红三叶白粉病的防治提供参考。更多还原

【Abstract】 Based on a field investigation of red clover powdery mildew (Erysiphe polygoni DC.), the linear relationship between the dry matter yield and disease incidence, disease severity and damage index were established by the path coefficient analysis, and a model of economic threshold for the disease control was developed. The model would be helpful to make decision on the disease control.更多还原