Combined effects of host-plant resistance and intraguild predation on the soybean aphid parasitoid Binodoxys communis in the field

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Soybean varieties that exhibit resistance to the soybean aphid Aphis glycines have been developed for use in North America. In principle, host-plant resistance to soybean aphid can influence the interactions between the soybean aphid and its natural enemies. Resistance could change the quality of soybean aphids as a food source, the availability of soybean aphids, or resistance traits could directly affect aphid predators and parasitoids. Here, we focus on the effect of soybean aphid resistance on the interactions between soybean aphids, the parasitoid Binodoxys communis (Hymenoptera: Braconidae), and predators of these two species. We determined whether host-plant resistance affected within-season persistence of B. communis by releasing parasitoids into resistant and susceptible soybean plots. We observed higher B. communis densities in susceptible soybean plots than in resistant plots. There were also higher overall levels of intraguild predation of B. communis in susceptible plots, although the per-capita risk of intraguild predation of B. communis was affected neither by plant genotype nor by aphid density. We discuss these effects and whether they were caused by direct effects of the resistant plants on B. communis or indirect effects through soybean aphid or predators.

Original languageEnglish (US)
Pages (from-to)16-25
Number of pages10
JournalBiological Control
Issue number1
StatePublished - Jan 2012

Bibliographical note

Funding Information:
We thank Patrick Day, Logan Fees, Sarah Gunderson and Stefanie Wolf for help with field work, Aaron Rendahl and Zeynep Sezen for statistical advice, Jason Harmon for help with literature, and David Ragsdale for providing seed. We also thank two anonymous reviewers for remarks that improved this manuscript. This work was funded in part with a grant from the Minnesota Soybean Research and Promotion Council to GEH, an EPA STAR fellowship to JMC, a fellowship from the University of Minnesota Graduate School to JMC, and the Minnesota Agricultural Experiment Station.


  • Aphis glycines
  • Binodoxys communis
  • Biological control
  • Host-plant resistance
  • Intraguild predation
  • Parasitoid


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