Bureau of Land Management and partners use weevil to combat invasive weed First release of the yellow starthistle rosette weevil on BLM-managed public lands EL DORADO HILLS, Calif. — The Bureau of Land Management, U.S. Department of Agriculture’s Agricultural Research Service and University of California Cooperative Extension have released yellow starthistle rosette weevils to combat the invasive weed, yellow starthistle, at the Magnolia Ranch day-use recreation area in El Dorado County. This is the first time the weevils have been released for biological control on BLM-managed public lands and only the second time the insect has been used in the United States.