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THE BIOLOGY OF NEODIPRION NIGROSCUTUM (HYMENOPTERA: DIPRIONIDAE) IN WISCONSIN1

Published online by Cambridge University Press:  31 May 2012

G. C. Becker  and
D. M. Benjamin
D. M. Benjamin
Affiliation:
Assistant Professor of Biology, Metropolitan State College, Denver, Colorado; Professor, Department of Entomology, University of Wisconsin, Madison.
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Abstract

The specific status of Neodiprion nigroscutum Middleton is firmly established by new data. The adult female is mostly black and brown. The second annulus of the lancet is generally weakly developed ventrally. The larvae have black head capsules in the first instar, but this coloration usually changes to reddish brown in the later instars. The third, fourth, and fifth feeding-instar larvae have unbroken subdorsal and supraspiracular lines, and broken postepipleural lines, but lack an epiproctal spot. The nonfeeding-instar larvae often have a pink body color. The egg mass of most females is green. Jack pine is the preferred host. The fecundity is approximately 100 eggs, but they are typically distributed over many branches, usually in one needle on each branch. Larval colonies composed of first- through fourth-instar larvae usually contain 3–10 larvae, while colonies of fifth-instar larvae usually contain 1–6 larvae. There are two generations per year in southern Wisconsin. Feeding-instar larvae are present in late May and June, and again (second generation) in August and September. The species is distributed throughout the jack pine stands of Wisconsin. Phenological data and notes on parasites are presented.

Type
Articles
Information
The Canadian Entomologist , Volume 99 , Issue 2 , February 1967 , pp. 146 - 159
Copyright
Copyright © Entomological Society of Canada 1967

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