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Competition between Prostephanus truncatus and Sitophilus oryzae on maize: the species that gets there first matters

Published online by Cambridge University Press:  06 May 2022

G. V. Baliota
Affiliation:
Laboratory of Entomology and Agricultural Zoology, Department of Agriculture Crop Production and Rural Environment, University of Thessaly, Nea Ionia, Magnesia 38446, Greece
D. S. Scheff
Affiliation:
United States Department of Agriculture, Agricultural Research Service, Center for Grain and Animal Health Research, 1515 College Ave., Manhattan, KS 66502, USA
W. R. Morrison III
Affiliation:
United States Department of Agriculture, Agricultural Research Service, Center for Grain and Animal Health Research, 1515 College Ave., Manhattan, KS 66502, USA
C. G. Athanassiou*
Affiliation:
Laboratory of Entomology and Agricultural Zoology, Department of Agriculture Crop Production and Rural Environment, University of Thessaly, Nea Ionia, Magnesia 38446, Greece
*
Author for correspondence: C. G. Athanassiou, Email: athanassiou@agr.uth.gr

Abstract

Laboratory tests were carried out in order to examine the population growth of Prostephanus truncatus (Horn) (Coleoptera: Bostrychidae) and Sitophilus oryzae (L.) (Coleoptera: Curculionidae) on maize. These two species were placed either simultaneously or one species was allowed to colonize the kernels 7 days earlier than the other, at two temperatures, 26 and 30 °C for 65 days. Apart from progeny production, grain quality parameters, such as insect-damaged kernels (IDK) and undamaged kernels (NDK), the weight of frass and kernel weight were measured. Our data confirms that temperature plays a key role in the competition of these two species; P. truncatus seems to perform better at the higher temperature (30 °C), regardless of the presence of an additional species. Moreover, the results of the present study demonstrates that P. truncatus outcompetes S. oryzae. Sitophilus oryzae produced fewer progeny than P. truncatus in all combinations. Given the outcome of a competition, we hypothesize that most of the kernel damage was due to feeding by P. truncatus. Based on these data, we surmise that P. truncatus has a competitive advantage as an invasive species in new areas with stored maize, even in the presence of S. oryzae.

Type
Research Paper
Copyright
Copyright © The Author(s), 2022. Published by Cambridge University Press

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Competition between Prostephanus truncatus and Sitophilus oryzae on maize: the species that gets there first matters
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