Abstract
Abstract Refining the process of selecting specialist herbivores that are used as biological control agents to maximise effects on the targets can diminish the risk to non‐target species. While biotic factors (e.g. plant demography and agent–host interactions) have been explored for clues to improve the way we make agent selection decisions, recent ecological research indicates that abiotic factors related to the habitat (e.g. plant and soil nutrient composition, and soil characteristics) are important predictors of insect herbivore community composition. In this paper we explore the relevance of plant nutrient composition to aid in selecting agents for the invasive Eurasian perennial Euphorbia esula (leafy spurge) in Illinois, USA. We propose that an approach that compares such abiotic factors across the native and invaded ranges of plants in conjunction with the community composition of specialist herbivores in the native range may yield valuable clues in selecting agents that are most likely to establish and regulate populations of the target weed.
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