Pesticide-Resistant Ticks Better Able to Survive Cold, Study Finds

Ticks that survive exposure to pesticides may become more tolerant of cold weather, potentially allowing them to spread tick-borne diseases to colder regions, according to a new study. Researchers from the University of Cincinnati and the U.S. Department of Agriculture tested the effects of a common pesticide on two species of dog ticks. They found that ticks that survived a non-lethal dose of the chemical were significantly more likely to survive freezing temperatures compared to ticks that had never been exposed to the pesticide. This increased cold tolerance could help ticks expand their range northward, where winters are harsh. Tick-borne illnesses such as Lyme disease and Rocky Mountain spotted fever are already a growing concern in parts of North America. The study suggests that overuse of pesticides might inadvertently make ticks hardier, not just against chemicals but also against environmental stress. The researchers caution that this could complicate efforts to control tick populations and the diseases they carry. Further research is needed to understand the mechanisms behind this adaptation and to develop better strategies for tick management.