Fire has direct and indirect effects on insects, but our understanding of these effects is confounded by several factors identified in this review. Direct effects are expressed through insect mortality due to exposure to fire, with few studies published on this topic. Indirect effects are expressed through changes in insect hosts and forest conditions, with bark beetle responses to fire-injured trees following prescribed fires and low-severity wildfires being the most studied. Although fire effects on pollinators are an emerging field of research, it is clear that fire can benefit pollinators by creating more open forest conditions, which, in turn, enhance floral resource availability. Bark beetle and defoliator epidemics can exert large effects on fuels, but their effects on wildfires are mixed. Differences in the severity, extent, and timing of epidemics, fire regimes, fire weather, topography, and the metrics and models used to assess wildfires, among other factors, confound our understanding of the effects of bark beetle and defoliator epidemics on wildfires.
