Hybrid California Honeybees Show Natural Edge Against Varroa Mites

UC Riverside tracked 236 colonies from 2019–2022 and found locally adapted hybrid California honeybees maintain lower Varroa mite loads—about 68% fewer mites and five times less likelihood of needing chemical treatments—than commercial queens. Lab tests also showed Varroa mites are less attracted to larvae from hybrid bees, especially around seven days old, hinting at a genetic defense formed early in development. The bees aren’t fully resistant, and researchers aim to identify the traits for future breeding to reduce chemical reliance and bolster global pollinator health.