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Published online by Cambridge University Press:  31 May 2012

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


The within-sample distributions of gallery length (GL) and egg (E) density as well as their functional relationships to the infested bole were studied in an epidemic population of the southern pine beetle in southeast Texas.

A least-squares linear regression analysis through the origin showed an average of 1.59 eggs per centimeter of gallery. GL accounted for 81% of the variation in E and thus is useful for estimating egg numbers. The density of attacking adults is unsatisfactory for predicting E.

GL and E are uniformly distributed within but not among the 100-cm2 sample disks at a given height. The functional relationship of both variables to the infested bole is adequately described by the model y = (A+Bx)exp(Cln(x−x2)), where y = GL or E per 100 cm2, x = the normalized height on the infested bole, and A, B, and C are parameters to be estimated for each set of data.

Copyright © Entomological Society of Canada 1976

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