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ORIENTATION AND DISPERSAL OF LATE-STAGE LARVAE OF PORTHETRIA DISPAR (LEPIDOPTERA: LYMANTRIIDAE)

Published online by Cambridge University Press:  31 May 2012

Charles C. Doane  and
David E. Leonard
Charles C. Doane
Affiliation:
Department of Entomology, The Connecticut Agricultural Experiment Station, New Haven
David E. Leonard
Affiliation:
Department of Entomology, University of Maine, Orono
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Abstract

Late-stage gypsy moth larvae, Porthetria dispar (L.), orient by polarized light in woodland openings. Activity of larvae was greatest before 1030 h and after 1400 h Eastern Standard Time, when plane-polarized sky-light was stronger and ground surface temperatures more moderate than during midday. Larvae in the opening were attracted to vertical objects up to 3 m distant at cardinal points closest to their path of orientation but much less to the cardinal points furthest away. Most larvae move in a north to northeast or south to southwest direction at abroad angle to the direction of the sun’s rays.

Type
Articles
Information
The Canadian Entomologist , Volume 107 , Issue 12 , December 1975 , pp. 1333 - 1338
Copyright
Copyright © Entomological Society of Canada 1975

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