CORVALLIS, Ore. — On a recent summer morning in a bright green meadow off a winding country road, Devon and Landon Prescott were prying open beehives. They moved quickly among the 1,400 wooden boxes, eyeing each brood and locating its queen. Landon, 19, spoke up after finding four hives with missing queens. "That's pretty bad," said Devon, 21, peering over his brother's shoulder to search the bee-covered screen. A hive without a queen is likely doomed. "That's really high."