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黄瓜黑星病主要危害叶片、茎、卷须及瓜条,幼嫩部分受害严重。幼苗期发病,真叶较子叶敏感,子叶产生黄白色圆形斑,严重时植株停止生长,叶片枯萎,以至全株枯死。叶片受害时,叶上出现淡黄色近圆形的病斑,后期病斑呈星状开裂。叶脉受害后,组织坏死,由于周围健状部组织继续生长,致使病叶扭皱。卷须、叶柄、果柄受害后,病斑呈梭形,大小不等,淡黄褐色,中间开裂,下陷,病部可见分泌物。瓜条被害,初期生
Cucumber scab disease main hazards leaves, stems, tendrils and melon, young part of the serious damage. Seedling incidence, true leaves more sensitive to cotyledons, cotyledons produce yellowish white round spots, severe plants stop growing, withered leaves, and the whole plant died. Leaf damage, the leaves appear pale yellow near the lesion, star-shaped lesion was later cracked. After the vein damage, tissue necrosis, due to the surrounding body parts to continue to grow, causing sick leaves twisted wrinkles. Tendrils, petioles, stalks victims, the lesions were spindle-shaped, ranging in size, light brown, the middle of the crack, sag, visible secretions of the disease. Guar strips were killed, early students