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Effects of a simple plant morphological mutation on the arthropod community and the impacts of predators on a principal insect herbivore

  • Plant Animal Interactions
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Abstract

Plant features that enhance predator effectiveness can be considered extrinsic-resistance factors because they result in reduced insect herbivory. In this paper we test the hypothesis that reduced epicuticular wax (EW) in Pisum sativum L. is an extrinsic-resistance factor contributing to field resistance to Acyrthosiphon pisum (Harris). We monitored pea aphid populations in the field on reduced EW and normal EW near isolines of peas for two seasons and confirmed that aphid populations are lower on reduced EW peas than on normal EW peas. We also monitored predators within the canopies of the two pea lines to discover community level patterns in response to differences in EW. We found that while predator numbers were similar between the two lines, there were more syrphids on the normal EW peas, and a trend towards more coccinellids on reduced EW peas. We tested the impact of predators on pea aphids on the two EW lines by monitoring their population levels in cages that excluded predators, and in cages that allowed predators to enter. We found that pea aphid populations were similar on the two EW lines when predators were excluded. When predators were allowed access to the plants, pea aphid populations were reduced more on reduced EW peas than on normal EW peas. We also examined the intrinsic resistance to aphids in reduced EW peas with laboratory dual-choice tests comparing aphid response to reduced EW and normal EW peas, and found that walking, apterous aphids displayed no preference for one pea line over the other. Bioassays to measure growth and fecundity of the pea aphid on the two EW types in the greenhouse and in the field showed that intrinsic rate of increase, and other life table parameters, were not different for aphids on the two lines. Together these results support the hypothesis that reduced EW in peas is a predator-dependent extrinsic resistance factor. Genetically reducing EW bloom in peas and other waxy crop plants might improve the effectiveness of arthropod natural enemies of insect pests. More generally, the results show that a subtle change in plant morphology can substantially influence the impact of predators on insect herbivore populations. The benefit of extrinsic resistance to herbivory conferred by reduced EW may balance any benefits of a prominent EW bloom, thereby sustaining EW polymorphisms in some natural plant populations.

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Acknowledgements

Research was supported by grants from the USDA CSREES Cool Season Food Legume Research Program and USDA/NRI competitive grant IDA09704-CG0175672 to SDE. Thanks to P. Duetting, S. Plumb, J. Neufeld, J. Rooker, and R. Kitt for their help in collecting data and thanks to B. Price for statistical advice. The manuscript was improved by critical reviews of G. Chang, P. Duetting, S. Emmert, H.J. Ding and E. Bechinski. This is paper #02710 of the Idaho Agricultural Experiment Station.

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  1. Claire E. Rutledge

    Present address: Department of Entomology, W. Lafayette, IN 47907, USA

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  1. Plant Soil and Entomological Sciences, University of Idaho, Moscow, ID 83844–2339, USA

    Claire E. Rutledge & Sanford D. Eigenbrode

  2. Department of Forestry, University of Idaho, Moscow, ID 83844–2339, USA

    Andrew P. Robinson

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  1. Claire E. Rutledge
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Rutledge, C.E., Robinson, A.P. & Eigenbrode, S.D. Effects of a simple plant morphological mutation on the arthropod community and the impacts of predators on a principal insect herbivore. Oecologia 135, 39–50 (2003). https://doi.org/10.1007/s00442-002-1114-2

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