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Survivorship patterns of larvae of Pieris rapae (L.) (Lepidoptera: Pieridae) in Massachusetts kale, with special reference to mortality due to Apanteles glomeratus (L.) (Hymenoptera: Braconidae)

Published online by Cambridge University Press:  10 July 2009

R. G. Van Driesche
R. G. Van Driesche
Affiliation:
Department of Entomology, Fernald Hall, University of Massachusetts, Amherst, MA 01003, USA
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Abstract

Survivorship curves for the pre-adult stages of Pieris rapae (L.) on kale in Massachusetts exhibited two patterns. Early season generations showed a linear decline with mortality in all stages, whereas late season generations showed reduced losses in larval instars 2-4 and a concentration of mortality in the fifth instar. Ratios of direct measurement of recruitment of P. rapae and its parasitoid Apanteles glomeratus (L.) to their first larval and egg-plus-larval stages, respectively, indicated that losses to parasitism for five host generations were 86·1, 9·1, 58·O, 71·7 and 40·3% for the 1985 third generation and the 1986 first to fourth generations. Patterns of percentage parasitism within single generations were determined by higher rates of mortality in parasitized than healthy older larvae (instars 3-5) and, in some cases, by higher rates of host than parasitoid recruitment towards the end of the generation.

Type
Original Article
Information
Bulletin of Entomological Research , Volume 78 , Issue 3 , September 1988 , pp. 397 - 405
Copyright
Copyright © Cambridge University Press 1988

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