Fortyfive-year-old Modugumudi Pullamma and her son M. Suresh (20) died when a tractor overturned at Kothapadu village in the district on Sunday. According to the villagers, the accident took place when the tractor on which Pullamma, her husband Pullaiah, and Suresh boarded, overturned at Komati Cheruvu. Pullaiah and he escaped unhurt.