We hypothesize that herbivory by predators is affected by the complexity of their diet. Coleomegilla maculata larvae fed prey - Acyrthosiphon pisum or Ostrinia nubilalis eggs - consumed two to three times more plant tissue (pinto beans) than those fed a mixed diet (containing pollen substitute and prey-based components). Simple, prey-only diets appear to lack plant-based nutrients important to this predator.
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Jonathan G. Lundgren, Susan E. Moser, Richard L. Hellmich and Michael P. Seagraves. "The effects of diet on herbivory by a predaceous lady beetle" Biocontrol Science and Technology
Vol. 21 Iss. 1 (2011) p. 71 - 74
Available at: http://works.bepress.com/richard_hellmich/86/