Screening of Cowpea Germplasm against Cowpea Aphid (Aphis craccivora Koch, 1854) under Artificial Conditions

The study was carried out during 2022-23 at the glasshouse complex in ICAR-National Bureau of Plant Genetic Resources, Regional Station, Rajendranagar, Hyderabad, to evaluate the resistance or susceptibility of cowpea genotypes against cowpea aphid, A. craccivora in artificial conditions. 109 genotypes categorized as resistant (R) or moderately resistant (MR) (selected from field experiments) and along with a check C-152 were subjected to artificially controlled aphid infestation in a glass house complex. None exhibited resistance based on aphid damage scores 1 to 5 after 21 days of infestation. Nevertheless, nine genotypes (IC372724, IC401381, IC372726, IC399000, IC400103, IC415590, IC420467, IC426812, and NBGP8/03(C-715) were considered moderately resistant, 61 genotypes and check C 152 were susceptible and thirty-nine genotypes were classified highly susceptible.