Resistance identification of 52 spring maize varieties to Rhopalosiphum maidis and Ostrinia furnacalis in Jiangxi Province
[Objective]Pests are one of the important factors affecting the yield and quality of maize.Evaluating the resistance level of different maize varieties to major pests has important guiding significance for the selection of insect-resistant varieties.[Method]In this study,we first observed the population dynamics of different pests for spring maize in Jiangxi Province,and identified the resistance to Ostrinia furnacalis and Rhopalosiphum maidis of 52 maize varieties via aphid quantity ratio method and stem hole number comparasions.Finally,insect-resistant maize varieties suitable for planting in the province were obtained through the investigation of maize yield and ear damage rate.[Result]we found that Mythimna loreyi,O.furnacalis,Mythimna loreyi,Spodoptera frugiperda,and R.maidis were the main pests of spring maize in Nanchang City,Jiangxi Province.Among them,the populations of corn aphid and Asian corn borer are relatively large.According to the ratio of aphid number,there were 17 high aphid-resistant varieties,5 aphid-resistant varieties,5 medium aphid-resistant varieties,6 susceptible varieties and 17 high susceptible varieties in 52 popularized varieties..According to the number of holes in the stem,there were 12 varieties with high resistance to Asian corn borer,14 varieties with resistance to Asian corn borer,12 varieties with moderate resistance,5 varieties with sensitivity and 9 varieties with high sensitivity.While the aphid resistance of some popularized maize varieties was poor,their resistance to borers was strong,while the resistance to borers was poor,their resistance to aphids was strong.However,there were three varieties(Jingke968,Shuangtian726,and Wanxiantian6188)showed highly resistance to both R.maidis and O.furnacalis.The yield of 52 varieties for 10 plants fluctuated from 0.90 kg to 4.24 kg.Wanxiantian6188,Daimuda,Weitian999,Meiyushuangtiannuo502,Jingke968 had a higher yield than other varieties.Most of the maize varieties had more than 50%of ear damage rate,except Shangmandi,Guitiannuo 108,Taitan,Baimuda and Guinuo 530.[Conclusion]The 52 maize varieties popularized in Jiangxi Province have different degrees of resistance to pests,and their yields under natural infection are also quite different.We found that Wanxiantian 6188 and Jingke 968 had strong resistance to aphid and O.furnacalis and higher yield in the natural insect-sensitive state.Therefore,it was recommended to plant Wanxiantian 6188 and Jingke 968 for spring maize in Jiangxi Province.These resistant varieties screened in this study provided materials and theoretical basis for breeding and popularizing maize insect-resistant varieties.
万方数据
维普
