WHAT THE EVIDENCE SAYS
A Nature Ecology & Evolution study fit Bayesian hierarchical models to insect- and pathogen-incidence records from more than one million trees across North America. The climate response was strongly context dependent: warming and drought jointly increased incidence in historically colder and wetter regions, while incidence tended to decline in warmer and drier regions. The authors then mapped how those relationships may shift under future climate scenarios.
WHY IT MATTERS / OUR READ
The useful management signal is that 'warmer means more forest pests' is too simple. Historical climate, host context and the identity of insects and pathogens shape where pressure is likely to intensify. Forest-risk planning therefore needs spatially explicit forecasts rather than one continental assumption.
CAVEATS / UNCERTAINTY
These are model-based incidence forecasts, not direct forecasts of tree mortality or ecosystem collapse. Responses differ among hosts and natural enemies, and future outcomes will also depend on disturbance interactions, host movement, management and climate trajectories.
SOURCE
Nature Ecology & Evolution
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