External rostral characters for differentiation of sexes in the biological control agent Mecinus janthinus (Coleoptera: Curculionidae)

Marjolein Schat; Sharlene E. Sing; Robert K. D. Peterson

doi:10.4039/n06-033

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Marjolein Schat,^1,* Sharlene E. Sing,¹ Robert K. D. Peterson¹

¹Department of Land Resources and Environmental Sciences, Montana State University, Bozeman, Montana

^*Corresponding author (e-mail: mschat@montana.edu).

Abstract

The stem-boring weevil, Mecinus janthinus (Germar), is a promising, well established classical biological control agent for the exotic invasive weed Dalmatian toadflax (Linaria dalmatica (L.) Mill.) (Scrophulariaceae). In this paper we present readily apparent rostral characters that can be used for sex differentiation of live stem-boring weevils at low magnification. These characters can be used by workers with little training to accurately sex weevils and can be used to rapidly determine sex ratios of field populations to improve timing of collection for redistribution.

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Marjolein Schat, Sharlene E. Sing, and Robert K. D. Peterson "External rostral characters for differentiation of sexes in the biological control agent Mecinus janthinus (Coleoptera: Curculionidae)," The Canadian Entomologist 139(3), 354-357, (1 May 2007). https://doi.org/10.4039/n06-033

Received: 10 April 2006; Accepted: 1 February 2007; Published: 1 May 2007

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