红腐病是一种分布广、为害较重的棉花苗期病害,在我国各棉区广泛发生,是棉花苗期的主要病害之一。常在出苗15天后逐渐取代炭疽病成为幼苗后期的首要病害,严重威胁棉花全苗、壮苗。症状:幼茎被害时,导管变成暗褐色,近上面的幼茎基部先产生黄褐色的条状病斑,后变成黑褐色腐烂, Red rot is a widely distributed and heavily damaged cotton seedling disease, which occurs widely in every cotton area in China. It is one of the major diseases of cotton seedling. Often 15 days after emergence gradually replace anthracnose become the most important disease late seedlings, a serious threat to cotton seedlings, strong seedlings. Symptoms: when the young stems are killed, the catheter becomes dark brown, young stems above the base of the first to produce brown stripes of the disease, after turning into dark brown decay,