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Phenology and Dormancy in the Milkweed Leaf Beetle Labidomera clivicollis (Kirby)

James O. Palmer
The American Midland Naturalist
Vol. 114, No. 1 (Jul., 1985), pp. 13-18
DOI: 10.2307/2425235
Stable URL: http://www.jstor.org/stable/2425235
Page Count: 6
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Phenology and Dormancy in the Milkweed Leaf Beetle Labidomera clivicollis (Kirby)
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Abstract

Central Texas milkweed leaf beetles Labidomera clivicollis (Kirby) have a predominantly nonoverlapping, bivoltine life history. Reproduction coincides with spring and autumn seasons of host plant growth as determined by the bimodal pattern of annual rainfall in the region. Spring and autumn generations are normally separated by summer or winter seasons unfavorable to beetle reproduction. Most beetles which have reproduced under the influence of long daylengths in the laboratory fail to survive these unfavorable seasons when transferred to field cages, whereas those which have not reproduced in the laboratory due to exposure to short day-lengths exhibit high survival. Adults cannot reproduce or survive an unfavorable season without some feeding after eclosion.

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