Abstract
The potential for intraguild predation (IGP) between larval and adult life stages of twopolyphagous arthropod predators common in NorthAmerican agroecosystems was studied in thelaboratory. Predators examined were the spinedsoldier bug, Podisus maculiventris Say,and the twelve-spotted ladybeetle, Coleomegilla maculata Lengi. A shared preyitem, eggs of the Colorado potato beetle (CPB),Leptinotarsa decemlineata Say, was alsoprovided to the predators, both to provide analternate food source and to quantify theimpact of IGP on the potential for pestsuppression by these two predators. Experimentswere conducted on single potato leaves inplastic cup arenas, and, subsequently, in cagesenclosing whole potato plants. IGP occurredasymmetrically, with P. maculiventrisadults and nymphs only attacking C. maculata larvae. Even though ladybeetle adultswere generally smaller than soldier bug adults,they were never preyed upon. This appears to bethe first documented case of a coccinellidshowing differential larval and adult immunityto attack by a larger invertebrate predator.The impact of IGP, when it did occur, on CPBegg consumption was equivocal. IGP did notconsistently influence levels of predation onthe eggs. Conversely, even when IGP did notoccur, predation on CPB eggs by both predatorstogether did not increase significantly overlevels inflicted by either predator alone. Theimplications for biological control of CPB bythese predators, which are being considered foraugmentative release in potato and tomato cropsin the United States, are discussed.
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Mallampalli, N., Castellanos, I. & Barbosa, P. Evidence for intraguild predation by Podisus maculiventris on a ladybeetle, Coleomegilla maculata: Implications for biological control of Colorado potato beetle, Leptinotarsa decemlineata . BioControl 47, 387–398 (2002). https://doi.org/10.1023/A:1015667004364
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DOI: https://doi.org/10.1023/A:1015667004364