Free Access
Volume 23, Number 1, 1992
Page(s) 1 - 9
Apidologie 23 (1992) 1-9
DOI: 10.1051/apido:19920101

Effects of temperature and host developmental stage on Ascosphaera torchioi Youssef and McManus prevalence in Osmia lignaria propinqua Cresson (Hymenoptera: Megachilidae)

R. Rusta and P. Torchiob

a  University of Nevada, Department of Biology, Reno, NV 89557-0015, USA
b  Utah State University, USDA ARS Bee Biology and Systematics Laboratory, Logan, UT 84322-5310, USA

Abstract - Eggs and fifth instar larvae of Osmia lignaria propinqua were inoculated with known concentrations of Ascosphaera torchioi spores and reared at 3 different temperatures. Chalk-brood prevalence was highest following inoculation of bees in the egg stage and when reared at lower temperatures (21 °C).

Key words: Osmia / chalk brood / mycosis / etiology