油菜的生育期长,生理性病害种类繁多,造成危害的原因比较复杂。因此,正确判断病害类型,对症采取防治措施,在生产实践中具有现实意义。 1 油菜生理性病害及致病原因 根据致病原因,油菜生理性病害可分为三类:一、灾害型生理性病害。它包括由灾害性天气所引起的旱、冷、冻、渍(涝)等生理性病害;二、缺素型生理性病 Rape long period of growth, a wide range of physiological diseases, the causes of the more complicated. Therefore, to correctly determine the type of disease, symptomatic prevention and control measures taken in practice has practical significance. 1 Rape Physiological Diseases and Pathogenic Causes According to the cause of the disease, physiological rape disease can be divided into three categories: First, the disaster-based physiological diseases. It includes physiological diseases such as drought, cold, freezing, stains (waterlogging) caused by disastrous weather;