rapid method of sampling for aphids on strawberries

A rapid system of sampling for strawberry aphids, Chaetosiphon fragaefolii (Cockerell) was developed for use by pest management scouts. Regression equations relating mean numbers of aphids/leaf, variances of those means and the proportion of unifested leaves (P sub(0)) were developed from samples of...

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Bibliographic Details
Published in:Journal of the Entomological Society of British Columbia 1990, Vol.87, p.50-55
Main Authors: Frazer, B.D, McGregor, R.R
Format: Article
Language:English
Subjects:
Aphididae
Chaetosiphon fragaefolii
computer programming
Fragaria
Homoptera
leaves
population dynamics
regression analysis
sampling
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Summary:A rapid system of sampling for strawberry aphids, Chaetosiphon fragaefolii (Cockerell) was developed for use by pest management scouts. Regression equations relating mean numbers of aphids/leaf, variances of those means and the proportion of unifested leaves (P sub(0)) were developed from samples of aphids from single leaves. The accuracy of the estimations were tested on data from 155 samples from commercial strawberry fields sampled by a professional pest management company. Means estimated from P sub(0) were sufficiently accurate for the intended purpose and only 2 hours were required to sample 300 leaves compared to 16 hours when all aphids on all leaves were counted from only 80 leaves. An electronic recorder was programmed to prompt an IPM scout for data entry, allow correction of errors and permit sampling from different subplots within a field.
ISSN:0071-0733
1929-7890