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FUNCTIONAL DESCRIPTION OF WITHIN-TREE LARVAL AND PROGENY ADULT POPULATIONS OF DENDROCTONUS FRONTALIS (COLEOPTERA: SCOLYTIDAE)1

Published online by Cambridge University Press:  31 May 2012

Adil M. Mayyasi ,
Robert N. Coulson ,
John L. Foltz ,
Fred P. Hain  and
William C. Martin
Adil M. Mayyasi
Affiliation:
Texas A&M University, College Station, Texas
Robert N. Coulson
Affiliation:
Texas A&M University, College Station, Texas
John L. Foltz
Affiliation:
Texas A&M University, College Station, Texas
Fred P. Hain
Affiliation:
Texas A&M University, College Station, Texas
William C. Martin
Affiliation:
Texas A&M University, College Station, Texas
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Abstract

Within-tree larval and progeny adult populations of Dendroctonus frontalis Zimm. attacking loblolly pine, Pinus taeda L., were investigated in order to define the distribution of larvae within sample units (100 cm2 disks of bark) and to describe the functional relationship of both larvae and progeny adults to the infested portion of the tree bole.

Larvae and progeny adults were sampled over the infested bole of the 50 trees. Two separate measures of progeny adults were obtained. The first measure was taken just prior to emergence from the tree and the second measure was obtained by rearing the insect until emergence from the sample disks was completed.

Larvae were found to be uniformly distributed within the total disk. The functional relationship of the larvae and the two measures of progeny adults to the normalized height on the infested bole was described by the two parameter nonlinear model y = Ax(1−x)eBx.

Highest larval density along the infested portion of the tree bole occurred just below the center and tapered abruptly towards the base and gradually towards the top of the tree. The density of progeny adults on the other hand was greatest just above the center portion of the infested bole and tapered abruptly towards the top and gradually towards the base of the tree. Both measures of progeny adults produced curves of virtually the same shape. However, the density of progeny adults was substantially less in the samples which were reared indicating that mortality agents continued to act on the population until emergence from the tree.

Type
Articles
Information
The Canadian Entomologist , Volume 108 , Issue 4 , April 1976 , pp. 363 - 372
Copyright
Copyright © Entomological Society of Canada 1976

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References

Coulson, R. N., Mayyasi, A. M., Foltz, J. L., and Hain, F. P.. Interspecific competition between Monochamus titillator (Fab.) and Dendroctonus frontalis Zimm. Environ. Ent. (in press).Google Scholar
Coulson, R. N., Hain, F. P., Foltz, J. L., and Mayyasi, A. M.. 1975. Procedures for sampling southern pine beetle populations. Misc. Publ. Texas agric. Exp. Stn. 1184. 20 pp.Google Scholar
Coulson, R. N., Mayyasi, A. M., Foltz, J. L., Hain, F. P., and Martin, W. C.. 1976. Resource utilization by the southern pine beetle, Dendroctonus frontalis (Coleoptera: Scolytidae). Can. Ent. 108: 353–362.CrossRefGoogle Scholar
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