黄瓜霜霉病和角斑病是两种常发性黄瓜病害。发病初期症状均呈退绿水浸状斑点,扩大后受叶脉限制出现多角形病斑;但有时也混合发生。由于症状相近,常给防治造成混乱,下面介绍两种病害的主要区别及防治方法。 角斑病叶上病斑初期较小,淡黄至黄褐色,中央呈油纸状,后期常开裂成孔,果 Cucumber downy mildew and angular leaf spot are two common cucumber diseases. Symptoms of early onset were retreat green flooding-like spots, enlarged by the limitations of the emergence of polygonal lobulation; but sometimes mixed. As the symptoms are similar, often cause confusion prevention and treatment, the following describes the two main differences between diseases and prevention methods. Lesions of leaf spot lesion early small, light yellow to brown, the central was oily paper, the late cracking often into holes, fruit