Evaluation of plant quality by Corythucha marmorata (Hemiptera: Tingidae) mothers: relationship between oviposition pref
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ORIGINAL PAPER
Evaluation of plant quality by Corythucha marmorata (Hemiptera: Tingidae) mothers: relationship between oviposition preference and nymphal performance on four sweet potato cultivars and goldenrod Vina Rizkawati1 · Morio Tsukada1 Received: 7 March 2019 / Accepted: 4 July 2020 © Springer Nature B.V. 2020
Abstract In novel plant–insect relationships, oviposition preference and nymphal performance determine host range evolution. Corythucha marmorata, native to North America and specialist on asteraceous plants, has been reported to exploit sweet potato (Convolvulaceae) in Japan. Here we examined the capability of females to oviposit and of nymphs to grow on both a conventional host (goldenrod, Solidago altissima) and novel hosts (four sweet potato cultivars), of which the test insects had virtually no experience of contact at the population level. We then tested whether female preference and offspring performance were correlated. Nymphal survival and development time were always significantly greater on goldenrod, followed by sweet potato cultivars Caroline Lea, Benisengan, Narutokintoki, and Beniazuma in that order. Female oviposition preferences showed a similar order. On higher-ranked plants, the females accepted the plant faster and had higher fecundity. When goldenrod was included in the analysis, nymphal development time and survival rate were significantly related to preoviposition period. When goldenrod was excluded, nymphal survival rate was still significantly related to preoviposition period. These results support the theory that females lay their eggs on the most suitable host to maximize offspring fitness, even though C. marmorata had no experience with sweet potato cultivars. As C. marmorata is a hemimetabolous insect, in which adults and nymphs have a similar feeding habit and exploit the same habitat, this relationship seems plausible. Keywords Plant–insect relationship · Nymphal survival · Development time · Tingidae · Chrysanthemum lace bug
Introduction In novel interactions between herbivorous insects and new host plants, both oviposition preference and offspring performance are important, as they determine the evolution of the host range and host–plant utilization (Thompson 1988; Pearse 2011). Plant choice by adult females can greatly influence offspring survivorship (Shikano et al. 2010) as the offspring need to eat as soon as possible after hatching and usually cannot move far to another host plant. Therefore, mothers are expected to lay their eggs on the most Handling Editor: Heikki Hokkanen. * Morio Tsukada [email protected]‑u.ac.jp 1
Insect Ecology Laboratory, Graduate School of Bioresources, Mie University, Tsu, Mie 514‑8507, Japan
suitable host to maximize offspring fitness (Jaenike 1978). However, the degree of correlation is still unclear. Some studies of oviposition preference and nymphal performance showed no relationship or even a negative one (Gratton and Welter 1998; Keeler and Chew 2008; Forister et al. 2009), whereas others showed a strong positive relationship
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