Journal of Economic Entomology (2009) 102, 2101-2108

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Kevin D. Johnson, Matthew E. O'Neal, David W. Ragsdale, Christina D. Difonzo, Scott M. Swinton, Philip M. Dixon, Bruce D. Potter, Erin W. Hodgson and Alejandro C. Costamagna (2009)
Probability of cost-effective management of soybean aphid (Hemiptera: Aphididae) in North America
Journal of Economic Entomology 102 (6), 2101-2108
Abstract: 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.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Matthew E. O'Neal, Scott M. Swinton, Alejandro C. Costamagna, Erin W. Hodgson, David W. Ragsdale

Research topic(s) for pests/diseases/weeds:
control - general

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Aphis glycines Soybean (Glycine max) U.S.A. (mid N)
Aphis glycines Soybean (Glycine max) U.S.A. (NE)