【摘要】 研究表明,随着小麦白粉病流行频率的提高,该病对小麦穗部的危害几乎与其对叶部的危害同等重要。供试的119个品种中,穗叶发病情况呈四种类型:I、穗叶均不发病;Ⅱ、穗病叶不病;Ⅲ、叶病穗不病;Ⅳ、穗叶均发病。以表现第Ⅳ类型的品种数最多,占95.8％。对表现第Ⅳ类型的品种穗叶病情资料所做的统计分析表明,穗部抗性与叶部抗性呈极显著的正相关(r=0.625)。更多还原

【Abstract】 Investigation indicated that the occurrence of powdery mildew on the ears of wheat was very common. The powdery mildew on the ears is as important as that on the leaves.Status of occurrence of powdery mildew on the ears and leaves of 119 wheat cultivars were divided into four types: 1 .Neither ears nor leaves were infected by the powdery mildew, 2. Ears were infected but any of the leaves was not infected, 3 .Leaves were infected but any of the ears was not infected: 4. Both ears and leaves were infected.Type 4 is the major type, its frequency is 95.8%. The statistical datum of status of occurr ofpowdery mildew of 114 wheat cultivars show that a significant posit- ive correlation exists between resistance of ears and resistance of leaves ( r = 0.4625**) .更多还原