Hybrid California Bees Develop Natural Resistance Against Varroa Mites

A hybrid bee in Southern California has developed a natural ability to combat ‘Varroa mites.’ According to a study conducted between 2019 and 2022, these hybrid bees exhibited 68 percent fewer parasites compared to commercial bee populations. The Varroa mite infestations during their larval phase were significantly reduced, and the need for chemical treatments dropped fivefold. April 21, Kathmandu.

While beekeepers worldwide continue to lose hives due to this deadly parasite, a particular hybrid bee in Southern California offers new hope. Scientists at the University of California, Riverside report that this bee has naturally developed resistance against the Varroa mite, deemed the most dangerous enemy in the global beekeeping community. In 2025 alone, approximately 62 percent of commercial hives across the United States were destroyed due to these mites.

Study Findings: 68 Percent Fewer Parasites
Published in the journal Scientific Reports, the research involved detailed microscopic examination of 236 hives from 2019 to 2022. It revealed that these hybrid bees in California harbored on average 68 percent fewer parasites than commercial bees. Moreover, the requirement for chemical treatments was reduced by a factor of five.

Lead researcher Genesis Chong-Echavez explained that these bees were not developed through commercial breeding programs but arose naturally from a mix of wild bees of diverse lineages, including African, Eastern European, Middle Eastern, and Western European genes. The resistance observed from the larval stage is among the study’s most remarkable findings. Laboratory tests showed that Varroa mites are less attracted to the larvae of these hybrids.

Future Opportunities:
Bees play an essential role in pollination, critical for agricultural production worldwide, with an economic value measured in billions of dollars. The discovery of this natural resistance could significantly benefit global apiculture and food security. According to entomology professor Boris Berka, the next challenge lies in identifying the specific genetic traits responsible for this resistance and spreading them to other bee species, thereby reducing reliance on chemical pesticides.