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Biological Control
Volume 8, Issue 1, January 1997, Pages 43-51

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doi:10.1006/bcon.1996.0493

Regular Article

Estimating Aphidophagous Coccinellid Populations in Alfalfa

This article is not included in your organization's subscription. However, you may be able to access this article under your organization's agreement with Elsevier.

N. C. Elliott and G. J. Michels, Jr. ¹

USDA, ARS Plant Science and Water Conservation Research Laboratory, 1301 North Western Street, Stillwater, Oklahoma, 74075

Received 15 February 1996;

accepted 30 September 1996. ;

Available online 22 April 2002.

Abstract

Precise yet time-efficient sampling methods for coccinellids would be useful in integrated pest management (IPM) research and decision-making in alfalfa. We compared quadrat sampling, removal sampling, counting coccinellids for a constant amount of time while walking slowly through a field (timed counts), and sweepnet sampling for estimating adult and larval coccinellid density in alfalfa. Removal sampling gave biased estimates of density of adultColeomegilla maculataDegeer, but gave acceptable estimates of density of adults of other species. Regression models were developed to convert relative population estimates of adult and larval coccinellids obtained by sweepnet and timed count sampling to absolute population estimates (number per m²). For adults, plant height was included in the best regression models for converting sweepnet catch and timed counts to population density. For larvae, plant growth stage was included in the best regression model for converting sweepnet catch to density. The number of aphids per 10 sweeps was included in the model for converting timed counts of larvae to density; however, this model was of little value because it explained only 13% of the variation in the relationship between timed counts and population density. Coefficients of determination of regression models for estimating adult density from timed count and sweepnet sampling were 0.90 and 0.93, respectively. The model for converting sweepnet catch of larvae had a coefficient of determination of 0.71. In terms of statistical precision achieved per unit time spent sampling, a 25-sweep sample was the most efficient sample unit for estimating adult density. A double 12-min removal sample was most efficient for sampling larvae, but this method gave biased estimates of larval density, and overall, sweepnet sampling was better.

Author Keywords: Insecta; Coleoptera; Coccinellidae; sampling; sweepnet; alfalfa IPM

¹ Current address: Texas A&M Agricultural Experiment Station, P.O. Drawer 10, Bushland, TX 79012.

Biological Control
Volume 8, Issue 1, January 1997, Pages 43-51

Result list | previous < 117 of 166 > next

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