论文部分内容阅读
——软腐病。细菌性病菌在土壤、粪肥和块茎上越冬，在潮湿、高温条件下易发病。发病初期块茎呈水渍状条斑，接着由块茎沿叶柄分枝处溢出灰色液，从上至下引起腐烂。 ——白绢病。真菌性病菌先从高出土壤 3厘米处的伤口入侵，发病初期呈水溃状，老病部则在逐渐腐烂下引起倒
- Soft rot. Bacterial germs overwinter in soils, manure and tubers and are susceptible to disease under humid, high temperature conditions. In the early stages of tubercle tubercle was water-streak-like plaque, then by the tubers along the petiole branches overflowing gray liquid, causing decay from top to bottom. - Sclerotium. Fungal pathogens invaded the wounds at a height of 3 cm above the soil. The early stages of the disease were watery and the old ones were gradually decayed and caused to fall