论文部分内容阅读
大棚栽培西瓜的苗期病害主要有猝倒病、立枯病、炭疽病、沤根等,防治苗期病害是培育壮苗的关键。一、苗期病害的危害症状 (一)猝倒病幼苗接近地面处出现淡褐色水渍状病斑,扩大后迅速绕茎1周,逐渐变为褐色,病部软化,明显干枯萎缩,子叶尚未凋萎,幼苗便容易突然倒伏死亡。土壤湿度大,遇有寒流、低温及连阴雨天气容易引起猝倒病的发生。
Greenhouse cultivation of watermelon seedling disease mainly damping-off disease, blight, anthracnose, scabies root, etc., prevention and treatment of seedling disease is the key to nurturing strong seedlings. First, the seedling disease damage symptoms (a) damping-off disease seedlings near the ground light brown stain-like spot, expand rapidly around the stem 1 week, gradually turned brown, the disease softens, significantly withered and withered, cotyledons not yet Withered, seedlings are prone to sudden lodging death. Soil moisture, in case of cold, cold and even the rainy weather can easily lead to the occurrence of damping off disease.