Vol. 10, Issue 11 (2021)

Author(s):
Ram Pal Verma, Ved Ratan, Prashant Singh and Vikram Singh

Abstract:
Potato (Solanum tuberosum L.) is one of the most important annual, herbaceous dicotyledonous and vegetatively propagated crop belong to family Solanaceae. Black scurf reduce tuber quality, marketability and cause a serious disease of potato worldwide. In India responsible for 10-25% yield loss, yield losses may reached up to 50% in severely affecting potato crops. The most appropriate symptoms of the black scurf were observed as sclerotial masses on tubers after harvesting of crop. Surveyed results indicated in the prevalence of disease at all the surveyed area viz., Karmullapur, Prempur, Tilyani, Shivpuri, Dheerpur, Badanpur, Saidpur, Nagla, Budrai, Hazratpur, Sawai, Dandaniyapur, Bibapur and Mugnisapur. The maximum percent disease incidence and disease severity was recorded in Firozabad district (36.50 and 17.07% respectively), followed by Agra (28.50 and 15.52% respectively), while minimum percent disease incidence and disease severity was recorded in Etawah district (17.00 and 8.97% respectively). Among the villages, maximum percent disease incidence and disease severity was recorded in Budrai village of Firozabad district (37.00 and 17.30% respectively) followed by Hazratpur village of Firozabad district (36.00 and 16.85% respectively) while minimum percent disease incidence and disease severity was recorded in Nagla village of Etawah district (15.00 and 8.80% respectively). The data pertaining to disease incidence and disease severity of seven isolates, RS-5 showed high disease incidence and disease severity (93.10 and 44.68% respectively) followed by RS-3 (92.30 and 42.46% respectively) while RS-13 showed least virulence and recorded minimum disease incidence and severity (82.14 and 33.53% respectively) followed by RS-7 (85.18 and 35.72% respectively) hence, the most virulent isolate (RS-5).