关键词: 麦红吸浆虫, 小麦品种（系）, 鉴定指标, 估计损失率, 抗性评价

Abstract: 【Aim】 Our study aims to screen more accurate resistance indicators and to evaluate the resistance of wheat varieties to the orange wheat blossom midge, Sitodiplosis mosellana (Diptera: Cecidomyiidae), so as to provide a scientific basis for screening and application of resistant wheat varieties. 【Methods】 During 2012 and 2013, 2013 and 2014, 85 and 83 wheat varieties were planted in the field in Zhouzhi County, Shaanxi province, respectively, and the number of larvae in wheat kernel per variety whose ear emergence growth stage was consistent with adult emergence period of insect was counted in the next year. The correlation between four resistance indicators including the estimated loss rate, percentage of infested grains, percentage of infested ears and insect number per ear, as well as the relationship between each indictor and the yield loss rate, were analyzed. According to the more accurate indicators screened, resistance of the planted wheat varieties to S. mosellana was evaluated.【Results】 The estimated loss rate not only exhibited the highest correlation but also was highly significantly correlative with other three indicators and the yield loss rate in both years. The total number of resistant varieties among the total evaluated wheat varieties was 25 during 2012-2013 and 40 during 2013-2014, respectively. Among the 16 wheat varieties planted repeatedly, 14 varieties exhibited resistance in both years, of which Kenong 1006 and Jinmai 47 were continuously highly resistant. 【Conclusion】 The estimated loss rate is a representative and better resistance indicator of wheat varieties to S. mosellana. Resistant wheat varieties screened can be used as the main extension varieties or reserved varieties in the occurrence areas of S. mosellana or as the parent material for breeding of resistant varieties.

Key words:  Sitodiplosis mosellana, wheat varieties, resistance indicator, estimated loss rate, resistance evaluation