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Economic injury levels for pea aphids (Hemiptera: Aphididae) as direct pests of commercial dry peas (Fabaceae) during reproductive growth stages in the Pacific Northwest of North America

Published online by Cambridge University Press:  29 March 2019

Bradley S. Stokes ,
Edward J. Bechinski  and
Sanford D. Eigenbrode
Bradley S. Stokes*
Affiliation:
Department of Entomology, Plant Pathology and Nematology, College of Agricultural and Life Sciences, University of Idaho, 875 Perimeter Drive M.S. 2339, Moscow, Idaho, 83844-2339, United States of America
Edward J. Bechinski
Affiliation:
Department of Entomology, Plant Pathology and Nematology, College of Agricultural and Life Sciences, University of Idaho, 875 Perimeter Drive M.S. 2339, Moscow, Idaho, 83844-2339, United States of America
Sanford D. Eigenbrode
Affiliation:
Department of Entomology, Plant Pathology and Nematology, College of Agricultural and Life Sciences, University of Idaho, 875 Perimeter Drive M.S. 2339, Moscow, Idaho, 83844-2339, United States of America
*
1Corresponding author (e-mail: bstokes@uidaho.edu)
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Abstract

Empirically-based economic injury levels are lacking for pea aphid, Acyrthosiphon pisum Harris (Hemiptera: Aphididae), as a direct pest of dry peas, Pisum sativum Linnaeus (Fabaceae). To address this need, the relationship between pea aphid density and yield of dry pea (cultivar Aragorn) were quantified by encaging pea aphids at varying densities for 17-day infestation periods during 2009 and 2010 in Moscow, Idaho, United States of America. Pea aphid density after infestation at the early reproductive stage of the crop (x) significantly reduced dry pea seed yield (relative weight of US #1 dry peas, y): y = 0.7733 − 0.00998x + 0.000037x2. Economic injury levels were computed based on this relationship and incorporating the cost of control, crop market value, insecticide efficacy, and crop yield potential. The resulting economic injury levels ranged from five to 19 pea aphids per plant at the start of early reproductive growth stages of dry peas. For usability these were converted to sweep net sample size equivalents of 86–307 pea aphids per twenty-five 180-degree sweeps with a standard sweep net. These economic injury levels are applicable in the inland Pacific Northwest, United States of America, where they were developed and likely in other regions with similar climatic and agronomic conditions.

Type
Insect Management
Information
The Canadian Entomologist , Volume 151 , Issue 3 , June 2019 , pp. 365 - 377
Copyright
© Entomological Society of Canada 2019 

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Footnotes

Subject editor: Julia Mlynarek

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