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通过温室和田间试验,鉴定品种资源对玉米北方炭疽病的抗病性,研究生育期、播期和种植密度等与病害发生程度之间的关系,并根据田间防治效果筛选化学药剂。结果表明,供试56个自交系在苗期对玉米北方炭疽病抗性分为5个类型,2个自交系表现为免疫,8个自交系表现为高抗,19个自交系表现为抗病,18种自交系表现为中抗,9个自交系表现为感病。成熟期抗性分为4个类型,6个自交系为高抗,25个表现为抗病,23个自交系表现为中抗,2个自交系为感病。抽雄期是发病的关键时期,发病最重;播期对该病害的发生无明显影响,种植密度增加会加重该病害的发生,差异不显著。供试6种药剂均对玉米北方炭疽病有一定的防治效果,扬彩防效最高,甲基托布津次之。
Through greenhouse and field experiments, the resistance of cultivars to anthracnose in northern maize was identified, and the relationship between the developmental stages, sowing dates, planting densities and disease occurrence was studied. Chemical agents were screened according to the field control effect. The results showed that there were five types of resistance to anthracnose in maize at the seedling stage in 56 inbred lines, two inbred lines showed immunity, eight inbred lines showed high resistance, 19 inbred lines The results showed that the resistances of the 18 inbred lines were moderately resistant and the 9 inbred lines showed susceptible disease. There were four types of resistance in maturity, six inbred lines were highly resistant, 25 were resistant to disease, 23 inbred lines showed resistance, and two inbred lines were susceptible. The tasseling stage is the critical stage of the disease, the most serious disease; sowing no significant impact on the occurrence of the disease, planting density will increase the incidence of the disease, the difference was not significant. Test 6 kinds of agents have a certain degree of control of corn Northern anthracnose control effect, Yang Cai highest anti-efficacy, followed by thiophanate-methyl.