Status and evaluation of soybean varieties against Mungbean Yellow Mosaic (MYMV) disease under changing climatic conditions of Kaymore plateau zone, Madhya Pradesh, India

For the first time in central India, an epidemic of Mungbean Yellow Mosaic Virus disease transmitted through white flies in soybean at R1-R3 stage was noticed as scattered yellow specks were noticed on upper leaves of soybean variety JS 335 during first week of August 2015 at Research Experimental Fields, JNKVV, Jabalpur. During 31st week (July, 2015), the rainfall (149.40mm, average temperature 26.70C, and average relative humidity 80%, rainfall of 149.0mm) enhanced dramatically the population of whiteflies (from 2-25 flies/leaf) that resulted in the epidemic. At farmer’s field covering 8 villages; the overall incidence was in the range of 53-70%. In seed production units, incidence was in the range of 63.0-70.0% in JS 335, JS 95-60, JS 93-05 and JS 90-41. During first week of August to Ist week of September, the average temperature was 27.77 0 C and relative humidity was 76.5%. Evaluation studies of 28 varieties, under Seed multiplication chain, indicate that most of the varieties exhibited the infection of MYMV (in the range of 40-70%), however, PS 1225 did not exhibit any infection among the same set of environment. Jawahar Soybean (JS 20-69) exhibited infection up to 5% only. Other variety of soybean JS 20-34 exhibited infection upto 40%.