Occurrence and Intensity of Major Diseases of Blackgram (Vigna mungo L.) in SPSR Nellore District, Andhra Pradesh, India

Abstract

Roving survey was conducted during rabi 2022-23 to know the severity of diseases in blackgram growing mandals namely., A.S Peta, Kondapuram, Kaligiri, Vinjamuru, Podalakur and Kandukuru and covers 33 villages. The highest Mungbean Yellow Mosaic Virus (MYMV) per cent disease index of 36.4% was recorded in Bommaraju cheruvu village of kaligiri mandal. Necrosis Disease or leaf curl disease in blackgram crop is becoming key viral disease next to MYMV. However, the highest incidence of 19.76 % was recorded in Nekunnampeta village of Kondapuram mandal. Whereas lowest leaf venial necrosis incidence of 2.5 % was observed in Amancherla village of podalakur mandal. The severity of Alternaria leaf spot ranged from 2.3-37.4 Per cent Disease Index. Of all the mandals surveyed, the highest mean incidence (21.8%) was recorded in Kaligiri mandal followed by 18.3% in Vinjamuru mandal. In the surveyed villages average per cent disease severity ranged from 4.2 to 43.7%. The highest (43.7%) disease incidence was observed on variety PU-31 in Magadevapuram village of Kandukur mandal. Of all the surveyed mandals, highest disease incidence was recorded in kandukur mandal with 18.4 % and lowest with 0.0 per cent disease incidence was observed in Vinjamuru mandal. The severity of Bacterial leaf spot ranged from 3.8 to 43.2 Per cent Disease Index observed on TBG 104 variety. Overall, our survey study provides information on the status of disease severity with cultivars adopted by farmers, which are helpful in development of resistant varieties and suitable management practices.