Construction of life tables to establish antibiosis resistance to the gram pod borer, Heliothis armigera (Hub) among chickpea genotypes

摘要

Life tables for Heliothis armigera (Hubner) on ten chickpea genotypes were constructed. The net reproductive ratio (Ro), mean length of generation (Tc), intrinsic rate of daily increase (rm), finite rate of daily increase(#lambda#), and weekly multiplication rate (e~(rm)~7 ranged from 142.14 to 268.63, 39.12 to 45.22, 0.1180 to 0.1385, 1.125 to 1.148 and 2.565 to 3.016, respectively on different chickpea genotypes. Based on weekly multiplication rate of H. armigera, these genotypes could be arranged as NDG-90-27, BG-1027, BG-267, IPCK-94-4, BDG-80, IPCK-94-2, H-89-96, C-235, L-550 and P-256, in the increasing order of their suitability for or decreasing order of their antibiosis in relation to this pest. Among the ten genotypes, net reproductive rate was higher on BG-1027, while the mean length of generation was shorter on C.235 in comparison to the standard check i.e., P-256. None of the genotypes was found more suitable than P-256 for H. armigera, with respect to any of the three population growth parameters, viz, intrinsic rate of increase, finite rate of increase and weekly multiplication rate.