Evaluation of okra germplasm for their reaction to whitefly, Bemisia tabaci and Okra yellow vein mosaic virus (OYVMV)

Abstract

Field screening studies for the whitefly and OYVMV resistance were conducted with 25 okra germplasm accessions during summer season of 2015 and 2016 at National Bureau of Plant Genetic Resources (NBPGR) Regional Station, Rajendranagar, Hyderabad. Lowest mean population of whiteflies was recorded in PSRJ-12952 (2.24), IC344598 (2.49) and RJR-124 (2.99), while PSRJ-13040 and RJR-193 recorded the highest number of whiteflies with a mean population of 10.79 and 9.67 whiteflies per 3 leaves. Among the okra accessions screened, one wild accession IC344598 and two cultivated accessions viz., PSRJ-12952 and RJR-124 did not show any signs of OYVMV infection throughout the crop period and exhibited immune reaction (0%) and recorded maximum yield. Okra accessions, PSRJ-13040 and RJR-193 exhibited a highly susceptible reaction, recording 84.16 and 83.33 per cent OYVMV incidence, respectively and also recorded lowest yield.