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A METHOD OF SAMPLING THE BALSAM WOOLLY APHID ON FRASER FIR IN NORTH CAROLINA1

Published online by Cambridge University Press:  31 May 2012

Gene D. Amman
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Abstract

Populations of the balsam woolly aphid on Fraser fir trees were sampled without replacement. Sampling frequency was based on the embryological period of the aphid at mean monthly temperatures in the field. The sample for each date consisted of 16 pieces of bark, 1/2 in. diameter, from each of 10 trees. Precision of the method was usually within ±10% of the mean. The largest proportion of variance was within trees. Stratification of samples by levels within trees decreased variance estimates.Frequency distributions of counts of most stages of the aphid approximated the negative binomial distribution. Therefore, data were transformed to logarithms in order to approximate the normal distribution.

Type
Research Article
Information
The Canadian Entomologist , Volume 101 , Issue 8 , August 1969 , pp. 883 - 889
Copyright
Copyright © Entomological Society of Canada 1969

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Footnotes

2

Present address: Intermountain Forest and Range Experiment Station, Forest Service, U.S.D.A., Ogden, Utah.

References

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