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近年来,小麦发生白粉病日趋严重。由于存在着比较复杂的生理小种,品种抗性不能稳定。从我们多年积累品种资源资料中,选择高抗秆、叶锈病的小麦品种27个,经过温室和田间苗期和成株鉴定,分成四类作为试材。沈阳地区小麦白粉病菌株属于 Pm/Pmx,4/1,2,3a,3b,3c,5型。试验结果表明,小麦白粉病慢发抗性的品种,具有:(1)普遍率和严重率低和上升速度缓慢;(2)菌落小而少;(3)分生孢子发生少,菌落再生力弱;(4)菌落扩展缓慢;(5)产量上影响不显著。利用严重率指数可以作为选择慢发抗病性的指标。
In recent years, the occurrence of wheat powdery mildew is worsening. Due to the existence of more complex races, variety resistance can not be stabilized. From our accumulated resources for many years, 27 wheat cultivars with high resistance to culm and leaf rust were selected and divided into four types as test materials after greenhouse and field seedling stage and adult plant identification. Shenyang powdery mildew strains belonging to Pm / Pmx, 4 / 1,2,3a, 3b, 3c, 5 type. The test results showed that the varieties with slow-onset resistance to wheat powdery mildew were as follows: (1) the prevalence rate and the serious rate were low and the rate of increase was slow; (2) the number of colonies was small and few; (3) the number of conidia was small and the colony regeneration Weak; (4) colony expansion is slow; (5) the yield is not significant. The use of severity index can be used as an indicator of slow disease resistance.