LEWISBURG, Pa. - Scientists investigating a mysterious ailment that killed many of the nation's honeybees are concentrating on pesticides and a new pathogen as possible culprits, and some beekeepers are already trying to keep their colonies away from pesticide-exposed fields.
After months of study, researchers are finding it difficult to tie the die-off to any single factor, said Maryann Frazier, a senior extension associate in Penn State University's entomology department.
"Two things right now ... that are really keeping us focused are the pathogen and the role of pesticides," Frazier said.
Scientists from Penn State and the U.S. Department of Agriculture are …
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