出苗后干旱对玉米丝黑穗病发病的影响

The Influence of Drought After Seedling Stage on Head Smut in Maize

选取2个不同抗性的玉米杂交种,播种期接种玉米丝黑穗病菌,出苗后(约6～7片叶)进行干旱处理,开花期调查发病率。结果发现,同一玉米品种干旱处理比对照的发病率高。说明苗后干旱增加了玉米丝黑穗病发病率。经分析发现存在携带病菌而不发病的植株,出苗后期保持适宜的水分可以减少玉米丝黑穗病的发生。

Two corn varieties with different resistance were inoculated by spore ot maize head smut when planting. Keeping drought during seedling stage（about 6 - 7 leaves） and investigating disease incidence at blooming stage, the result showed that the disease incidence of drought keeping part is much higher than that of check and some plants without symptom with head smut fungi were discovered. So we can draw a conclusion that the disease incidence of head smut can be reduced if we keep suitable water after seedling stage.