辽宁省玉米北方炭疽病发生条件与药剂防治

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。

Occurrence Condition and Chemical Control of Maize Eyespot in Liaoning Province

Resistant germplasm resources to maize eyespot were identified by greenhouse and field trial. Relationship between stage, sowing date, planting density and severity degree of maize eyespot were studied. Fungicides were screened according to field trail. The results indicated 56 inbred lines were divide into five resistant types to maize inbred lines in seeding stage, two inbred lines were immune type; eight inbred lines were high-resistant type; nineteen inbred lines were resistant type; eighteen inbred lines were moderate resistant type; nine inbred lines were susceptible type. At maturation stage, fifty-six inbred lines were divided into four resistant types to maize eyespot, six inbred lines were high-resistant type; twenty five inbred lines were resistant type; twenty-three inbred lines were moderate resistant type; two inbred lines were susceptible type. Tasselling stage was the most susceptible stage to maize eyespot in 3 maize stages. It was not significant severity change of maize eyespot on 3 planting dates. Planting density could aggravate severity of maize eyespot, but had no significant difference; six fungicides could control maize eyespot to a certain degree, control efficiency of azoxystrobin-propiconazole was the highest, second was thiophanate-methy.