Reaction of maize germplasm to maize stem borer, Chilo partellus Swinhoe Chavan B.P., Sr. Res. Asstt., Khot R.B., I/C Asstt. Maize Entomologist, Harer P.N., Maize Breeder All India Coordinated Maize Improvement Project, NARP, Kolhapur - 416 012, Maharashtra, India Abstract Seventy-seven maize germplasm lines belonging to full season maturity (16 entries), medium maturity (31 entries) and extra early maturity group (30 entries) were evaluated for resistance to stem borer, Chilo partellus Swinhoe under artificial infestation. The leaf injury rating due to C. partellus damage ranged from 2.4 to 6.4 on a 1–9 rating scale in different maturity groups. The least susceptible germplasms (< 3.0 rating) included PARBHAT, BIO 9681 and KMH-22202 (Full season maturity); HKH-1191, L-166, CM-500 and KMH-22205 (medium maturity) and JH-31053, CHH-215 and CM-500 (medium maturity). NECH-129, SEEDTEC-2324 (Full season maturity); CHH-219, X-85, KH-510 (medium maturity) and FH-3277, VL-108, DEH-10103, HIM-129 (extra early maturity) were found highly susceptible (> 6.0 rating) to C. partellus. Top |