Evaluation of Chickpea Genotypes for Resistance to Beet Army worm, Spodoptera exigua

摘要

Chickpea genotypes were evaluated for resistance to Spodoptera exigua pest under field and laboratory conditions. In the detached leaf assay, the genotypes RIL 20 and ICC 12475 at the vegetative stage, and ECS83264, ICC 12475 and RIL 25 at the flowering stage suffered lower leaf damage (DR 1.0- 1.8) as compared to ICCL 86111 (DR 6.8). There were no significant differences in larval survival among the genotypes tested. However, only 22.4% larvae survived on ICC 12475 as compared to 60.0% on ICCL 86111at the vegetative stage, and 23.3% larvae survived on KAK 2 as compared to 73.3% on ICC 10393 at the flowering stage. Larval weights were significantly lower on RIL 20, ICC 10393 and EC583264 (5.6 - 7.1 mg per larva) as compared to the larvae reared onthe susceptible check, ICC 3137 (21.8 mg per larva) at the vegetative stage. There were no significant differences in larval weights at the flowering stage. Percentage pupation was significantly lower on KAK 2, RIL 20 and ICC 12475 (10.0-11.4%) as compared to that of ICC 10393 (35.0%) at vegetative stage, and on ICCV10, EC583264, ICCL 86111, ICC 3137, ICC 12475 and KAK 2 (10.1 - 15.6%) at the flowering stage as compared to 34.3% pupation on ICC 10393. There were no significant differences in larval period and pupal weights of the insects reared on different chickpea genotypes. Under field conditions, there were no significant differences in Helicoverpa armigera and S. exigua eggs and larvae ofS. exigua on different genotypes at the vegetative, flowering and maturity stages. However, significant differences were observed in H. armigera larvae on different genotypes at all the three stages. The lowest H. armigera larval density and leaf and pod damage were recorded on ICC 12475. Grain yield was significantly greater in ICCV 10 (1732.0 kg/ha), ICCL 86111 (1248.3 kg/ha), ICC 10393 (1132.1 kg/ha) and ICC 12475 (1127.8 kg/ha) than in the susceptible check, ICC 3137 (73.3 kg/ha). The genotypes suffering lower damage and with high grain yield potential can be used in chickpea improvement for resistance to S. exigua.