Epidemic of Mungbean Yellow Mosaic Virus (MYMV) Disease of Soybean: A Potential Threat in Changing Weather under Agro-climatic Conditions of Jabalpur, Madhya Pradesh

In all 11 major diseases were observed at VC-V3, R1-R3 and R5-R6 stage at pre-selected farmer's field of 8 villages covering 24 locations employing fixed plot monitoring method. An epidemic of MYMV was experienced which had never been major disease problem-threat under Jabalpur (22°49’ and 20°80’ N latitude and 70°21’ and 80°58’ East longitude at an altitude of 411.78 MSL) conditions. In the changing weather conditions, the congenial temperature and humidity during first and second fortnight of August, 2015 boosted up the population of virus vector whitefly and epidemic of MYMV. In the first week of August, MYMV appeared as scattered specks on few top leaves in JS 335. Within a short period of 10–12 days the disease spread rapidly and covered more than 90% plant population. In the first week of August, at initial stage, presence of whiteflies (2 flies/leaf) was noticed. During 31^st standard week (July, 2015), the rainfall was149.40 mm and maximum temperature 29.8 and minimum 23.6°C (av. 26.7°C) with average relative humidity 80% was noticed.