Three sampling methods for estimating abundance of alfalfa weevil larvae (Hypera postica Gyllenhal) were evaluated for both accuracy and precision. A plastic bag/Tullgren funnel method collected significantly fewer second, third, fourth instar and total larvae than did the bucket-shake method. Calibration equations were developed to convert intensity estimates (alfalfa weevil larvae per alfalfa stem) obtained from the plastic bag/Tullgren funnel method to bucket-shake estimates. Sweep-net sampling produced significantly lower coefficients of variation than both bucket-shake and plastic bag/Tullgren funnel sampling methods, however mean estimates of larval abundance obtained from sweep-net sampling could be reliably converted to bucket-shake estimates for only fourth instar larvae.
Evaluation and Calibration of Sampling Methods Used to Estimate Abundance of Alfalfa Weevil Larvae (Coleoptera: Curculionidae)
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John M. Luna, F. William Ravlin; Evaluation and Calibration of Sampling Methods Used to Estimate Abundance of Alfalfa Weevil Larvae (Coleoptera: Curculionidae). Journal of Entomological Science 1 July 1992; 27 (3): 202–208. doi: https://doi.org/10.18474/0749-8004-27.3.202
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