Abstract
Several examples are known of utilisation of non-target native species by biological control agents for invertebrate pests and weeds, but analyses of the consequences for the species are lacking. Four scenarios are considered, depending on the extent of co-occurrence of agent and nontarget and the agent’s relative preference for non-target and target species. Together with examination of some field examples, this suggests that in most cases impacts are limited, but the potential exists for serious impacts. A risk analysis approach is advocated to proposals for release with some examples. Lack of relevant research data is a major problem.
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