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Susceptibility of cranberries to Drosophila suzukii (Diptera: Drosophilidae)

Steffan, Shawn A., Lee, Jana C., Singleton, Merritt E., Vilaire, Auriel, Walsh, Doug B., Lavine, Laura S., Patten, Kim
Journal of economic entomology 2013 v.106 no.6 pp. 2424
Drosophila, Vaccinium macrocarpon, adulthood, adults, cranberries, eggs, fruit growing, hosts, introduced species, larvae, larval development, marshes, mechanical damage, pests, puparium, wilting
Drosophila suzukii Mastsumura (Diptera: Drosophilidae), commonly referred to as the spotted-wing drosophila, is an exotic species that has proven a troublesome pest of fruit production in the U.S. The fly targets small fruit and thus represents a concern for the U.S. cranberry industry. Two studies were conducted to assess whether cranberries may serve as hosts for D. suzukii. In the first study, the suitability of ripe, unripe, and over-ripe cranberries were assayed by examining oviposition and larval development in no-choice trials. In a second study, wounded and unwounded fruit were examined as potential hosts in choice trials. The first study showed that ripe, unripe, and over-ripe cranberries were unsuitable hosts (very few eggs were laid, with no surviving puparia). In the wounded/unwounded berry trials, no larvae survived to adulthood among unwounded berries. Among wounded fruit, however, adult flies emerged. Together, these results suggest that unwounded cranberries—even previous-year fruit—are unsuitable as hosts for D. suzukii. Conversely, wounded ripe fruit can serve as hosts. Fortunately for cranberry growers, wounded fruit tend to rot and wilt in the field, so are unlikely to be harvested. Across the landscape, cranberry marshes with rotting fruit may contribute to D. suzukii source-sink dynamics.