Economic Impact of a Potential Expansion of Pest Infestation: Apple Maggot in Washington State

Apple maggot ( Rhagoletis pomonella ) is an insect pest of apple ( Malus domestica ) that is currently limited in extent in the commercial production areas of Washington State thanks to a quarantine program. We estimate the costs to the Washington economy if this pest were to spread more widely. Apple maggot control costs are related to the pressure of codling moth ( Cydia pomonella ), the most prevalent insect pest in commercial apple production in Washington State. It was found that the losses for the Washington apple industry’s range from $510 million to $557 million, depending on the codling moth pressure. Our findings underscore the importance of an efficient quarantine program that minimized the risk of spreading the pest along with additional costs associated with quarantined areas.