Lethal soil temperature impedes tuber formation, enhances respiration and depletes the tuber’s reserves and reduced size and viability. Attempts were made to increase soil temperature to lethal level by clear plastic mulch (PM), with hot water irrigation (HW), and its effect was assessed on growth of C. rotundus. During June 2010, quantity and frequency of hot water irrigation required to maximize the soil temperature was standardized using rain out shelter, load cell–digital weighing device by gravimetric method (40 liter/m2 and once in 4 days). During September 2011, effect of randomly stitched varied thickness 50, 75, 125 and 175 micron plastic mulch of size 1.25 x 1.25 m2 was spread over C. rotundus infected micro-plot and HW irrigated on soil temperature was assessed. Increased soil temperature under different thickness PM was at par with 175 micron. Further, the mean soil temperature and day/night fluctuation in plastic mulch with hot water (PM + HW) plot was congenial for C. rotundus growth, enhanced spouting and development of new tubers during September. During April 2012, hot water irrigated during 2.00-3.00 PM, soil temperature reached lethal level. Further, woolen blanket cover (WBC) between 4.0 PM to next day 9.0AM, retained warm temperature during night and maintained higher initial soil temperature next day. Thus during April, led soil temperature (58º C) to lethal level during 30 days of integrating PM + HW + WBC and caused drastically reduction of biomass (87%), number of tubers (62%) per 0.025m2 with loss of tuber viability.