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Location of Helicoverpa zea (Lepidoptera: Noctuidae) larvae on different plant parts of determinate and indeterminate soybean

Published online by Cambridge University Press:  02 June 2020

Dominic D. Reisig*
Affiliation:
Department of Entomology and Plant Pathology, North Carolina State University, Vernon G. James Research and Extension Center, 207 Research Station Rd., Plymouth, NC27962, USA
Don Cook
Affiliation:
Delta Research & Extension Center, Mississippi State University, P.O. Box 197, Stoneville, MS38776, USA
Jeremy Greene
Affiliation:
Department of Plant and Environmental Sciences, Clemson University, Edisto Research and Education Center, 64 Research Road, Blackville, SC29817, USA
Michael Caprio
Affiliation:
Department of Biochemistry, Molecular Biology, Entomology and Plant Pathology, Mississippi State University, Box 9775, Mississippi State, MS 39762, USA
Jeff Gore
Affiliation:
Delta Research & Extension Center, Mississippi State University, P.O. Box 197, Stoneville, MS38776, USA
Fred Musser
Affiliation:
Department of Biochemistry, Molecular Biology, Entomology and Plant Pathology, Mississippi State University, Box 9775, Mississippi State, MS 39762, USA
Francis Reay-Jones
Affiliation:
Department of Plant and Environmental Sciences, Clemson University, Pee Dee Research and Education Center, 2200 Pocket Road, Florence, SC29506-9727, USA
*
Author for correspondence: Dominic D. Reisig, Email: [email protected]

Abstract

Helicoverpa zea (Boddie) is a damaging pest of many crops including soybean, Glycine max (L.), especially in the southern United States. Previous studies have concluded that oviposition and development of H. zea larvae mirror the phenology of soybean, with oviposition occurring during full bloom, younger larvae developing on blooms and leaves, intermediate aged larvae developing on varying tissue types, and older larvae developing on flowers and pods. In a field trial, we investigated the presence of natural infestations of H. zea larvae by instar in determinate and indeterminate soybean varieties. In complementary experiments, we artificially infested H. zea and allowed them to oviposit on plants within replicated cages (one with a determinate variety and two with an indeterminate variety). Plants were sampled weekly during the time larvae were present. In the natural infestation experiment, most larvae were found on blooms during R3 and were early to middle instars; by R4, most larvae were found on leaves and were middle to late instars. In contrast, in the cage study, most larvae were found on leaves regardless of soybean growth stage or larval stage. Determinate and indeterminate growth habit did not impact larval preference for different soybean tissue types. Our studies suggest H. zea larvae prefer specific tissue types, but also provide evidence that experimental design can influence the results. Finally, our finding of larval preference for leaves contrasts with findings from previous studies.

Type
Research Paper
Copyright
Copyright © The Author(s), 2020. Published by Cambridge University Press

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