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SAMPLING POPULATIONS OF PINE LEAF CHERMID PINEUS PINIFOLIAE (HOMOPTERA: CHERMIDAE): III. NEOSISTENTES ON WHITE PINE1

Published online by Cambridge University Press:  31 May 2012

John B. Dimond  and
Douglas C. Allen
John B. Dimond
Affiliation:
Department of Entomology, University of Maine, Orono
Douglas C. Allen
Affiliation:
Department of Entomology, University of Maine, Orono
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Abstract

A population index for the estimation of the neosistens stage of pine leaf chermid on white pine is described. This is based on the observation that increasing numbers of the chermid produce increased stunting of length of pine needles. A regression relating chermid population density to needle length produced a correlation coefficient of −0.88, suggesting that measurements of needle length alone adequately estimate chermid populations under most conditions. The numbers and distribution of needles that must be measured to estimate length with reasonable precision are calculated. The total sampling plan for the four cyclic generations of the chermid is reviewed.

Type
Articles
Information
The Canadian Entomologist , Volume 106 , Issue 5 , May 1974 , pp. 509 - 518
Copyright
Copyright © Entomological Society of Canada 1974

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References

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