黄瓜黑星病是由半知菌类枝孢霉属的瓜疮痂枝孢霉菌侵染致病的。病菌发育的适宜温度为20℃～22℃。病菌以菌丝体随病残组织在土壤或架材、棚架上越冬,成为第二年的初侵染病源,也可以分生孢子附着种子表面或以菌丝潜伏种皮内越冬,并成为远距离传播的主要途径。田间植株发病后靠雨水、气流、农事作业重复浸染。 病害发生与温度、湿度十分密切。田间温度9℃～30℃,相对湿度85％以上,病害就会流行。温室大棚中,除温度、湿 Cucumber scab is caused by the half-known bacteria Mycoplasma cucurbitacum Cladosporium Cladosporium infection pathogenic. The optimum temperature for pathogen development is 20 ℃ ~ 22 ℃. Mycotoxins with disease residual tissue in the soil or frame material, shelter overwinter, becoming the second year of the initial source of infection, you can also conidia attached to the surface of seed or hyphae hypocotyl winter, and become The main way to spread long distances. After the onset of field plants by rain, air flow, agricultural operations repeated dip. Disease occurs with the temperature, humidity is very close. Field temperature 9 ℃ ~ 30 ℃, relative humidity above 85%, the disease will be prevalent. Greenhouses, in addition to temperature and humidity