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Genetic analysis saves major apple-producing region of Washington state
Date:3/22/2013

In August 2011, researchers from the U.S. Department of Agriculture were presented with a serious, and potentially very costly, puzzle in Kennewick, Wash. Since Kennewick lies within a region near the heart of Washington state's $1.5 billion apple-growing region, an annual survey of fruit trees is performed by the Washington State Department of Agriculture (WSDA) to look for any invading insects. This time the surveyors discovered a crabapple tree that had been infested by a fruit fly that they couldn't identify.

It was possible that the fly's larvae, eating away inside the crabapples as they grew toward adulthood, belonged to a relatively harmless species that had simply expanded its traditional diet. In that case, they posed little threat to the surrounding apple orchards in central Washington.

But the real fear was that they represented an expansion in the range of the invasive apple maggot fly, known to biologists as Rhagoletis pomonella. If so, then this would trigger a costly quarantine process affecting three counties in the state.

"In one of the world's leading apple-growing regions, a great deal of produce and economic livelihood rested on quickly and accurately figuring out which one of the flies was in that tree," says Jeffrey Feder, professor of biological sciences and a member of the Advanced Diagnostics & Therapeutics initiative (AD&T) at the University of Notre Dame. "And for these flies, it can sometime turn out to be a difficult thing to do."

As Feder and his team, including graduate student Gilbert St. Jean and AD&T research assistant professor Scott Egan, discuss in a new study in the Journal of Economic Entomology, the WSDA sent larvae samples to Wee Yee, research entomologist at the USDA's Yakima Agricultural Research Laboratory in Wapato, Wash. One larva was sent to Notre Dame for genetic analysis. The study sought to compare Notre Dame's genetic analysis to Yee's visual identification after th
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Contact: Kirk Reinbold
Kirk.Reinbold.2@nd.edu
574-631-1470
University of Notre Dame
Source:Eurekalert

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