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一、根腐病。该病为杜种幼苗的主要病害。发病幼苗的根部皮层和侧根逐渐腐烂,上部枯死,但病株不倒。此病多发生于高温高湿的6～8月份。防治方法:①下种前每亩用1公斤70％的五氯硝基苯进行土壤消毒灭菌;移栽前打窝后,可用此药(亩用药量为0.3公斤)与干细土拌匀后撤施对土壤进行消毒。②发病后应立即拔除病株,并用50％退菌特600倍液全部喷洒病区,防止蔓延。
First, the root rot. The disease is the main disease Du seedlings. The seedling root cortex and lateral roots gradually decay, the upper part of the dead, but the diseased strains do not fall. The disease occurred in high temperature and humidity of 6 to August. Prevention and treatment methods: ① Before planting seed with 1 kg per acre of 70% of the pentachloronitrobenzene soil disinfection sterilization; playing nest before transplanting, the drug can be used (mu dose of 0.3 kg) and dry fine soil mix well After the withdrawal of the soil disinfection. ② after the onset of diseased plants should be immediately removed, and with 50% of the bacteria back to 600 times all spraying the ward to prevent the spread.