Screening of Maize Genotypes against Maize Stem borer, Chilo partellus(swinhoe)

摘要

A total of 55 maize genotypes obtained from Regional Maize Research Center (RMRC) Dharwad, Karnataka including with a resistant check, DHM 117 and a susceptible check, 30v92 were screened against stem borer, Chilo partellus during kharif '2013 under natural field conditions. Among these, 22 genotypes including checks were selected for further screening during rabi 2013-14 & 2014-15. Among the 20 maize genotypes, fifteen exhibited a damage score of 1.2 to 2.2, where ST X BM 254-1 (1.2), Dhk 12 X 5321(1.3), ST X BM 32 (1.3), ST X 5422 (1.3), ST X BM 258-1 (1.4) and ST X BM 59-3(1.4) were designated as resistant. The remaining genotypes P3596, Dhk 12 X CM 1504, DHM 117, Dhk 12 X CM 142, ST X 5311, ST X 5416, ST X BM 254-3 and Dhk 12 X CM 151 were moderately resistant ranging from 1.6 to 1.8. The genotypes ST X BM 59-1 (1.9) and P3396 (2.2) are designated as intermediate resistant. The highest intensity of damage was recorded in susceptible check 30v92 (3.5) which was followed by DhkXCM 135 (3.0), STXRNBL 4611 (2.8), Dhk 12 X CM213, Dhk 12 X CM 138 (2.5) andDhk 12 X 5304 (2.3) which were designated as susceptible to stem borer, C. partellus.