Prevalence and Incidence of Onion Yellow Dwarf Virus (OYDV) Infecting Onion (Allium cepa L.) Crop in Indian Punjab

摘要

Onion showed flattening of leaves, mosaic, curling, yellow stripes, twisting of scape, stunted growth and dwarfing type of symptoms during survey in 2014-15 under Punjab conditions. Mean disease incidence of O YD V was maximum in S AS Nagar (23.57%) followed by Patiala (19.13%), Ludhiana (12.21%), Amritsar (7.95%), Bhathinda (6.94%), Sangrur (6.3%) and Barnala (3.31 %). Highest disease incidence was recorded in bulb to seed crop (30.17%) followed by table purpose (9.23%) and seed to seed crop (8.42%). In table purpose onion incidence washigh in kharif season (10.91%) as compare to rabi (5.87%). Growth and yield parameters such as plant height, bulb size, seed weight were also affected by OYDV.