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While enhancing the searching ability of a natural enemy can give a major improvement in host population suppression, it is important to demonstrate selectivity in favor of the third trophic level when changes, such as added floral resources, are made to agro-ecosystems to enhance biological control efficacy. To explore this question, a pea-aphid endoparasitoid, Aphidius ervi, and its hyperparasitoid,...
Adding floral resources to agro-ecosystems to improve biological control can enhance the survival, egg load, and parasitism rate of insect parasitoids. However, this may not always be the case because the herbivore may benefit from the added resource as much as, or more than the third-trophic level. In addition, the natural enemies of those in the third-trophic level may also derive improved fitness...
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