玉米丝黑穗病的主要传染途径是土壤。在土壤带菌的情况下,播种后的土壤温度和湿度影响其发病程度。在春玉米区,播种时间不同,造成土壤温、湿度的差异,发病率有所轻重。但在对具体播期的确定上,目前尚有不同意见:有的认为,早播发病重,因为出苗期拖长,而带来了侵染机会;而有的认为,早、晚播都发病轻,以玉米适期播的发病率最高,因为病菌侵染所要求的土壤 Maize head smut is the main route of infection is the soil. In the case of soil-borne diseases, the temperature and humidity of the soil after sowing influence the degree of its occurrence. In the spring corn area, sowing time is different, resulting in differences in soil temperature and humidity, the incidence of severity. However, there are different opinions on the specific sowing date. Some believe that early sowing is a serious problem because of the prolonged emergence and the chance of infection. Some people think that both early and late sowing Light, the highest incidence of maize sowing the best, because the bacteria invade the soil required