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Neonicotinoid insecticides disrupt predation on the eggs of turf-infesting scarab beetles

Published online by Cambridge University Press:  19 May 2010

D.C. Peck  and
D. Olmstead
D.C. Peck*
Affiliation:
Department of Entomology, New York State Agricultural Experiment Station, Cornell University, 630 W. North St, Geneva, NY 14456, USA
D. Olmstead
Affiliation:
Department of Entomology, New York State Agricultural Experiment Station, Cornell University, 630 W. North St, Geneva, NY 14456, USA
*
*Author for correspondence Fax: +1-315-787-2326 E-mail: dp25@cornell.edu
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Abstract

Turfgrass applications of imidacloprid were previously shown to suppress the abundance of certain soil arthropods. To ascertain whether those impacts harbor functional consequences, the effect of neonicotinoids on Japanese beetle (Popillia japonica Newman) predation was examined in three experiments that measured removal of eggs implanted into non-irrigated field plots. A first experiment confirmed that a single imidacloprid application reduced the abundance of nontarget fauna and the rate of egg removal. A second experiment compared the impacts of imidacloprid with those of three other neonicotinoids, while a third measured the impact of imidacloprid when applied in July, August or September. Egg removal declined 28.3–76.1% in imidacloprid-treated plots across all studies. Effects were detected as early as one week after treatment (WAT) and persisted as long as four WAT. The extent of suppression did not vary across month of application. Clothianidin, dinotefuran and thiamethoxam also suppressed egg removal, and the effects were similar among them and with imidacloprid. There was no discernible association between variation in rainfall and treatment effects, but this was not explicitly tested. Results support the hypotheses that a single neonicotinoid application can suppress predation on pest populations and that the effect does not vary with respect to active ingredient or season of application. Neonicotinoid application at the time of beetle oviposition puts intended effects (mortality of neonates) in conflict with unintended effects (disruption of egg predation). The conservation of predation on early life stages might buffer the reduced efficacy of late season applications that target more advanced instars. As application timing and post-application irrigation affect insecticide performance, they might also be manipulated to reduce nontarget effects.

Keywords

imidaclopridnontarget effectsPopillia japonicasoil insect peststurfgrasswhite grubs
Type
Research Paper
Information
Bulletin of Entomological Research , Volume 100 , Issue 6 , December 2010 , pp. 689 - 700
Copyright
Copyright © Cambridge University Press 2010

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