小麦品种间感染纹枯病的差异及普遍率与严重度的关系

通过人工接菌方法比较了６个小麦主栽品种间感染纹枯病的差异，结果表明，高感类型有阜阳８６１、温麦４号和皖麦１９，中感类型有扬麦１５８、豫麦１８和豫麦２１．各品种苗期病株率反映不出品种感病程度的差异，以灌浆后期的病情指数为标准比较品种间抗感染程度较为适宜．认为寄主生育阶段影响小麦纹枯病的ＩＳ关系．回归分析表明，按内茎和外茎发病程度分级可减少田间调查误差，且省时省工．

Infection difference of wheat varieties to Rhizoctonia cerealis and relationship between incidence and severity.

By means of artificial inoculation, the infection difference of 6 wheat varieties to wheat sharp eyespot disease ( Rhizoctonia cerealis ) was compared. The disease incidence of varieties at their seedling stage could not reflect the difference of infection among them, and it was available to use disease index to compare the infection difference at their late milking stage. It was considered that the growth stage of host affected the relationship between incidence and severity. The regression analysis shows that the classification based on disease index in internal and external stems could decrease the errors of field investigation, and save time and manpower.