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TIP DAMAGE AS AN INDEX OF NANTUCKET PINE TIP MOTH POPULATION DENSITY (LEPIDOPTERA: TORTRICIDAE)1

Published online by Cambridge University Press:  31 May 2012

F. M. Stephen  and
G. W. Wallis
F. M. Stephen
Affiliation:
Department of Entomology, University of Arkansas, Fayetteville, Arkansas 72701
G. W. Wallis
Affiliation:
Department of Entomology, University of Arkansas, Fayetteville, Arkansas 72701
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Abstract

In order to establish a functional relationship between damaged pine tips apparently infested with Nantucket pine tip moth, Rhyacionia frustrana (Comstock), and within-tip larval and pupal population, X-ray techniques were used to determine numbers of actually infested tips and the numbers of tip moth immatures contained therein. Linear relationships existed between these variables and changes in tip moth density. The effect of different plantations, tip moth generations, season, and tree age did not significantly alter the observed relationships. Approximately 40% of the damaged (i.e. apparently infested) tips were actually infested, and these tips contained an average of 1.4 tip moth immatures per tip. The equation Y = −.509 +.57X estimates the number of tip moth immatures, given the number of apparently damaged tips per tree (r2 =.71).

Type
Articles
Information
The Canadian Entomologist , Volume 110 , Issue 9 , September 1978 , pp. 917 - 920
Copyright
Copyright © Entomological Society of Canada 1978

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References

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