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Probability of Cost-Effective Management of Soybean Aphid (Hemiptera: Aphididae) in North America
Journal of Economic Entomology
  • Kevin D Johnson, Iowa State University
  • Matthew E. O'Neal, Iowa State University
  • D. W. Ragsdale, University of Minnesota - Twin Cities
  • C D Difonzo, Michigan State University
  • Scott M Swinton, Michigan State University
  • Philip M. Dixon, Iowa State University
  • Bruce Potter, University of Minnesota - Extension
  • Alejandro C Costamagna, Iowa State University
  • Erin W. Hodgson, Iowa State University
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Soybean aphid, Aphis glycines Matsumura (Hemiptera: Aphididae), is one of the most damaging pests of soybean, Glycine max (L.) Merrill, in the midwestern United States and Canada. We compared three soybean aphid management techniques in three midwestern states (Iowa, Michigan, and Minnesota) for a 3-yr period (2005–2007). Management techniques included an untreated control, an insecticidal seed treatment, an insecticide fungicide tank-mix applied at flowering (i.e., a prophylactic treatment), and an integrated pest management (IPM) treatment (i.e., an insecticide applied based on a weekly scouting and an economic threshold). In 2005 and 2007, multiple locations experienced aphid population levels that exceeded the economic threshold, resulting in the application of the IPM treatment. Regardless of the timing of the application, all insecticide treatments reduced aphid populations compared with the untreated, and all treatments protected yield as compared with the untreated. Treatment efficacy and cost data were combined to compute the probability of a positive economic return. The IPM treatment had the highest probability of cost effectiveness, compared with the prophylactic tank-mix of fungicide and insecticide. The probability of surpassing the gain threshold was highest in the IPM treatment, regardless of the scouting cost assigned to the treatment (ranging from $0.00 to $19.76/ha). Our study further confirms that a single insecticide application can enhance the profitability of soybean production at risk of a soybean aphid outbreak if used within an IPM based system.


This article is from Journal of Economic Entomology 102(6):2101-2108. 2009
doi: 10.1603/029.102.0613

This article is the copyright property of the Entomological Society of America and may not be used for any commercial or other private purpose without specific written permission of the Entomological Society of America.
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Entomological Society of America
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Kevin D Johnson, Matthew E. O'Neal, D. W. Ragsdale, C D Difonzo, et al.. "Probability of Cost-Effective Management of Soybean Aphid (Hemiptera: Aphididae) in North America" Journal of Economic Entomology Vol. 102 Iss. 6 (2009) p. 2101 - 2108
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