All India Co-ordinated Shorghum Improvement Project, IARI Regional Research Station, Hyderabad, 500 030
Online published on 25 January, 2012.
Differences between shoot fly susceptible and resistant progenies get established from F3 generation. Heritability estimate for shoot fly resistance is about 25%. Selection of progenies exhibiting 6-7-20% (15°-26°) mortality when mortalities range between 6.7–67% (15°-55°) results in isolation of resistant progenies. Selection intensities below 10% may not result in increased gains.
Exotic, Indian and derived lines when grown in their respective groups exhibit significant group differences indicating non-perference for oviposition to be the primary mechanism for shoot fly resistance. Resistant lines of economic worth have been isolated through selection in exotic × Indian crosses. 36A among male steriles and its B-line, 36A × 148 among commercial hybrids, 148, 168, 329, 604 and R-16 among the derivatives combine resistance to shoot fly with agronomic attributes and are being recommended for general cultivation.
