BOISE, Idaho — The federal government’s 5-year, $67 million rehabilitation effort following a 2015 wildfire in southwest Idaho and southeast Oregon is entering its second year with another round of herbicide applications combined with plantings of native species. The U.S. Bureau of Land Management has started applying the herbicide Imazapic on federal lands to knock out invasive weeds in Oregon and will begin in Idaho in October, officials said this week. The rehabilitation is part of the federal government’s plan to develop new strategies to combat increasingly destructive rangeland wildfires, mainly in Great Basin states that contain significant habitat for greater sage grouse, a bird found in 11 Western states.