黄瓜黑斑病的防治黄瓜黑斑病是由格链孢属的瓜格链孢菌引起的一种真菌病害，温棚及霜地黄瓜均可发生，以温棚黄瓜受害较重。如条件适宜，此病在短期内即能造成流行，严重影响黄瓜产量。１症状：病株多从下部叶片发病逐渐向上部叶片扩展。叶片上病斑不规则，中央淡黄白色... Control of cucumber black spot cucumber black spot disease is a fungal disease caused by Alternaria Alternaria of the Geosporium, greenhouse and frost cucumber can occur, to greenhouse cucumber damage. If the conditions are right, the disease can cause epidemics in the short term, seriously affecting the yield of cucumber. 1  symptoms: diseased plants and more from the lower leaves of the disease gradually expanded to the upper leaves. Irregular lesions on the leaves, the central yellowish white ...