Deformed wing virus complicates stress impact prediction in honey bees

Honey bee health is influenced by multiple stressors including pesticides, parasites, pathogens like deformed wing virus (DWV), temperature, and food availability. A model shows DWV suppresses immunity, creating two stable states—healthy or declining—depending on initial colony conditions. This explains why pesticide effects vary in field studies: small initial differences lead to divergent outcomes, making real-world results contradictory. The study highlights the complexity of system interactions in colony health.