玉米青枯病发生规律及影响因子的研究

通过对玉米青枯病发生规律及影响因子的研究 ,结果表明 :青枯病始发期一般在 8月下旬 ,盛期在 9月上中旬 ,不论何时播种 ,开始发病都是在玉米灌浆末至乳熟初期 ,高峰在乳熟后至蜡熟期。玉米灌浆乳熟期多雨高湿的条件有利发病 ;品种的抗病性与病害的发生流行关系密切 ;早播或早熟玉米发病重于晚播或中晚熟玉米 ;连作、密植、缺钾等条件下发病偏重。大面积种植感病品种是导致青枯病浒的重要因素。

Research on the Rule of Occurrence and Effectual Factors of Corn Bacterial wilt

The results of the research on the rule of occurrence and effectual factors of corn bacterial wilt show that the wilt starts in late August, and widely develops in early or middle September. Whenever maize is sown, it is infected with the wilt at the end of the seed filling stage to the beginning of the milk ripe stage. The wilt reaches the peak after the milk ripe stage to the wax ripe stage. The conditions of raininess and high moisture at the milk ripe stage are favourable for the wilt. The breed resistance against the disease has close relation to the occurrence and development. The early sown or early riped breeds get worse infected than the late sown or late riped ones, and planting the infected breeds in large areas is one of the important factors which foster the development. Also, maize is affliced with a worse wilt under the conditions either of continuous cropping, or of concentrated growth, or of potassium deficiency. The research supplies a certain scientific rule for the direct use of the disease tolerant variety in maize production.