Comments by de Jong et al ., Solter et al ., and Sloggett question the ecological relevance of the abundant microsporidia found in the invasive ladybird Harmonia axyridis . We contend that there is abundant evidence that native ladybirds feed on H. axyridis eggs and that interspecific microsporidial transfer is a common phenomenon, supporting the proposed role of these parasites as biological weapons.