Department of Plant Pathology, CCS Haryana Agricultural University, Hisar-125004
National Symposium on Strategic Issues in Plant Pathological Research held at Department of Plant Pathology, CSK HP Krishi Vishvavidayalaya, Palampur on November 24–25, 2011
Onion yellow dwarf virus (OYDV) belonging to family potyviridae, caused crinkling, curling and faint chlorotic stripes on the leaves of the bulb as well as seed crop. Some plants showed prominent yellow stripes on leaves and scapes of seed crop followed by twisting and bending The disease incidence of about 68 percent was recorded in seed crop. The mechanical transmission of OYDV on onion seedlings was upto 68.88 percent. It was also transmitted by nymphs of different aphid species such as Aphis craccivora (46.87%), A. gossypii (53.31%) and Myzus persicae (62.5%). The OYDV had very narrow host range & restricted only to Allium cepa and Allium satium. Double antibody sandwitch enzyme-linked immunosorbent assay (DAS-ELISA) studies demonstrated that the OD ranged from 1.24 to 2.82 after the first hour and increased further at 1.86 to 3.10 after 2 hours at 405 nm.
