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通过分析甘薯苦丝病田间症状以及病原分离和流行因子试验，表明甘薯苦丝病是属甘薯黑斑病菌侵染与土壤缺硼所致复合症状，其发生流行与耕作制度没有明显相关性，而与品种、土壤质地、肥料种类、供水丰缺密切相关：７－３品种最感病，病薯率为５９５％，岩高粉、岩齿红抗性最好，病薯率小于２％；含硼量较高的紫色土病薯率明显比含硼量相对较低的沙壤土、壤土发病轻；施农家粪肥、菜籽饼肥比纯施化肥发病轻；灌溉条件好的比灌溉条件差的发病轻。
Through analyzing the field symptoms of sweetpotato diseased and the pathogen separation and epidemic factor test, it showed that the sweetpotato diseased was a complex symptom caused by the infection of Alternanthera philoxeroides and boron deficiency in soil, and its prevalence was not significantly correlated with the tillage system It is closely related to variety, soil texture, fertilizer type and water supply abundance. The most susceptible variety is 7-3, the disease rate is 595%, rock high powder and rock dent red are the best, the disease rate is less than 2% ; The rate of purple soil with higher boron content was significantly lower than that of sandy loam with relatively low content of boron and less incidence of loam soil; that of manure and rapeseed with fertilizer was lower than that with pure fertilizers; irrigation conditions were worse than those with irrigation The incidence of light.