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Plant effects on prey choice by a vespid wasp, Polistes arizonensis

Abstract. 1 The effects of sunflower, Helianthus annuus, and groundcherry, Physalis pubescens, eaten by the tobacco budworm (Heliothis virescens), on predation by paper wasps (Polistes arizonensis) were examined. 2 Polistes arizonensis foragers took more caterpillars from H. annuus plants than P. pubescens in paired‐choice tests. 3 They took longer to locate prey and apparently gave up searching faster on artificial plants mimicking P. pubescens than on artificial plants mimicking H. annuus. 4 In paired‐choice tests for chemical effects, wasps chose more caterpillars within H. annuus odour than in P. pubescens odour. 5 They also chose more H. annuus‐reared larvae than P. pubescens‐reared larvae when they were presented without plants. Handling time was not affected.