连续半个多月受低温寡照天气影响,部分大棚番茄疫霉根腐病开始发生。该病一直是棚室蔬菜病害防治的难点,发病速度快,毁灭性强,必须加以重视。番茄疫霉根腐病发生初期于茎基部或根的上部产生褐斑,逐渐扩大后凹陷,严重时病斑绕茎基部或根都一周,地上部逐渐枯萎。纵剖茎基部或根部,导管变为深褐色,后根茎腐烂,不长新根,植株枯萎而死。该病属真菌性病害,发病与天气有 For more than half a month, affected by the weather of low-temperature and low-temperature, part of the greenhouse tomato Phytophthora root rot began to occur. The disease has always been a vegetable greenhouse disease prevention and control difficulties, the incidence of fast, devastating, we must pay attention. Phytophthora capsici at the initial occurrence of the base of the stem or root of the upper part of the brown spots, gradually expanded after the depression, severe lesions around the base of the stem or root all week, aboveground gradually wilt. Longitudinal section of the root or root, the catheter becomes dark brown, after the root rot, not long new roots, plants withered and died. The disease is a fungal disease, disease and the weather there