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青苗是西瓜栽培中一个非常重要的环节,人常说:“西瓜高产看苗期”。在培育壮苗过程中,防治猝倒病、立枯病、炭疽病又是确保壮苗的关键。一、病害主要症状。(一)猝倒病:四瓜幼苗被病菌侵害后,最初在幼苗接近地面出现水渍状病斑,后来病斑迅速绕茎一周,变为褐色,病部软化明显缢缩,病株容易突然倒伏。(二)立枯病:西瓜幼苗患病基部产生椭圆形暗褐色病斑,早期病菌白天萎蔫,夜晚恢复正常。病斑逐渐凹陷,环绕株茎,最后收缩干枯、死亡。(三)炭疽病:西瓜幼苗期发病,茎基部病斑黑褐色,缢缩,致使幼苗猝倒
Young watermelon cultivation is a very important part of cultivation, often say: “Watermelon high yield seedling look.” In nurturing strong seedlings, the prevention and treatment of damping-off disease, blight, anthrax is the key to ensure strong seedlings. First, the main symptoms of disease. (A) damping-off disease: Four melon seedlings were attacked by bacteria, the first seedling near the ground water stain-like lesions appeared, and later lesions quickly around the stem a week, turned brown, significantly softening of the diseased part of the diseased plants easily sudden Lodging (B) blight: Watermelon seedling disease at the base of oval dark brown lesions, early wilt during the day and night, back to normal at night. Lesions gradually concave, around the stems, and finally shrink dry, dead. (C) anthracnose: watermelon seedling stage disease, the base of the stem spot dark brown, shrinking, resulting in seedling cataplexy