Vol. 12, Issue 9 (2023)

Author(s):
Sinu Juneja, AP Bhagat, Mohammad Ansar, Matlooba Naseem, Sangeeta Shree

Abstract:
An experiment was conducted at Bihar Agricultural University, Sabour, Bhagalpur, Bihar during 2020-21 to evaluate the effect of yellow dwarf disease in different genotypes of onion. Thirty genotypes were screened against the yellow dwarf disease inducing symptoms like dwarfing, bending, streaking, curling, leaf flattening and abnormal bulb growth etc. Incidence of disease ranges between 0-27.86% and disease index >50% was found in seven genotypes e.g. W-364, W-464, W-182, ALR, B. Shweta, B. Dark Red, R-1606. Maximum genotypes were observed in category of moderately susceptible whereby none of them were found under highly susceptible category. For confirmation, molecular detection of plant samples of all genotypes was done using RT-PCR. Most of genotypes were confirmed for the OYDV where maximum number of samples were found positive (70%) in genotype W-500. This study will be beneficial for farmers to choose less susceptible varieties of crop and acquiring crop protection strategies based on field response of disease.