The Wragg Fire, a 6,500-acre blaze burning near Lake Berryessa in Solano and Napa counties for nearly a week, was thought to be mostly under control. But it flared up Tuesday, forcing more evacuations. An additional 150 acres burned within previously established containment lines, said officials from the California Department of Forestry and Fire Prevention, as the blaze intensified on its southern flank in the Wildhorse Canyon area. Roughly 136 homes and 200 residents on Mix Canyon, Sky Ranch and Blue Ridge roads were under mandatory evacuation orders just a day after all evacuations had been lifted.