Disease occurrence and resistance evaluation of different wheat cultivars （lines） to wheat leaf blotch | 不同小麦品种（系）叶枯病田间发病情况及抗性评价

Chinese. 在自然发病条件下,系统调查了河南省主栽小麦叶枯病在2005年-2007年的田间发病情况,并采用自然病圃法鉴定了49个小麦品种对叶枯病的抗性.结果表明：供试小麦品种（系）叶枯病都有不同程度的发生,多数供试品种田间发病相对较轻,但在不同年份间,发病程度存在差异,2006年度所有供试品种均发病轻,而2005年和2007年则发病较重.抗性评价结果表明,49个小麦品种（系）中,没有对叶枯病的免疫品种;表现抗病的品种有40个,占供试品种的81.63%,其中高度抗病品种11个,中度抗病品种29个;表现感病的品种有9个,占供试品种的18.37%,其中,中度感病品种6个,高度感病品种3个.综合3年试验数据表明,河南主栽或新选育小麦品种（系）中,多数品种对叶枯病表现抗病,但也有少数品种表现高度感病.[著者文摘]

English. In order to master the occurrence of wheat leaf blotch and evaluate resistance of wheat cultivars （lines） in Henan Province from 2005 to 2007, 49 wheat cultivars（lines） were selected and their resistance to wheat leaf blotch were identified. The results showed that all the tested materials were infected by pathogen, but the infection degree was obvious different among the tested materials in different years, the disease ratios and indexes of 2005 and 2007 were both higher than those of 2006. Among 49 tested materials, no immune cultivar （line） was found; 40 wheat cultivars （lines） showed resistance to the wheat leaf blotch, account for 81.63 % of the total materials,among which 11 wheat cultivars （lines） showed highresistance and 29 wheat cultivars （lines） showed moderate resistance. 9 eultivars （lines） were susceptive to wheat leaf blotch, account for 18. 37 % of the total materials, among which 6 wheat eultivars （lines） showed moderate susceptivity and 3 wheat cultivars （lines） showed high-susceptibility. The results indicated that most of the tested materials were resistant to wheat leaf blotch, a few were highly susceptive to the wheat leaf blotch.