常德市黄瓜疫病的发生规律研究

Study on Occurrence Regularity of Phytophthora melonis katsura in Changde City

黄瓜疫病是常德市黄瓜病害之一,严重制约黄瓜产量。通过田间定点系统调查和气象分析,证明常德市黄瓜疫病的始发期为5月,伴随雨季的到来,黄瓜疫病呈现逐渐加重的趋势。气温在22～26℃,伴随连续降雨,黄瓜疫病流行蔓延速度快,病情加重。疫病与日照存在一定的线性关系,轮作能够减轻病害的发生。

Phytophthora melonis katsura has become one of the most serious yield-limiting foliar diseases of cucumber in Changde City. According to the field survey and artificial inoculation ,Phytophthora melonis katsura initially occurred in May and became rapidly aggravated epidemic as the rainy season came.Phytophthora melonis katsura spread quickly when the temperature was from 22℃to 26℃,and accompanied continuous rain. The disease and sunshine there existed certain linear relationship.Crop rotation could reduce the disease severity.