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CHANGES IN THE SEX RATIO OF DENDROCTONUS FRONTALIS (COLEOPTERA: SCOLYTIDAE) ON PINUS TAEDA DURING THE ATTACK PROCESS

Published online by Cambridge University Press:  31 May 2012

Barry G. Hynum
Barry G. Hynum
Affiliation:
Texas Forest Service, Pest Control Section, Lufkin, Texas 75901
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Extract

In studies of the southern pine beetle, Dendroctonus frontalis Zimm., on loblolly pine, Pinus taeda L., one of the theories about the mechanism of attack is a shift in sex ratio from 100% to 25% females (Renwick and Vité 1970). This paper reports a test of this theory using trees that were naturally infested.

Thirty-one naturally infested loblolly pine trees were observed in July 1978, near Cut-and-Shoot, 19 km east of Conroe, Montgomery County, Texas. A 0.66 m quadrat was marked off on the bole of each tree at heights of 3 m and 3.66 m. Gallery starts in the quadrat were counted and marked every 24 h on each tree. The quadrat was reduced to a 0.33 m section on the bole at heights of 3.33 to 3.66 m on a tree after the attack density reached 1 gallery/100 cm2 and to a 0.16 m section at heights of 3.50 and 3.66 m on the bole after the attack density reached 2 gallerys/100 cm2; this facilitated timely counting and stabilized error due to observer fatigue.

Type
Articles
Information
The Canadian Entomologist , Volume 112 , Issue 12 , 01 December 1980 , pp. 1317 - 1318
Copyright
Copyright © Entomological Society of Canada 1980

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References

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