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Phenology and spatial distribution of adult and larval spotted wing drosophila in small fruit, stone fruit, and wild hosts in New York 2012

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Project Leaders: Greg Loeb, Dept. of Entomology, Cornell University, and Juliet Carroll, NYS IPM Program, Cornell University

Cooperators: Art Agnello and Peter Jentsch, Dept. of Entomology, Cornell University

Abstract:

Spotted wing drosophila (SWD) Drosophila suzukii, originally from Asia, is a new invasive fruit pest that became established in NY and surrounding states in 2011. Unlike other fruit flies that typically only infest overripe and rotten fruit, female SWD oviposit in ripe fruit thereby making them unmarketable. Soft-skinned fruit are at greatest risk. We monitored adult SWD and larval infestations for small fruit and stone fruit crops, and potential wild hosts through the season to determine crops at most risk, timing of infestation, spatial variability, relationship between adult captures and larval infestations, and role of wild hosts. Crops at most risk include fall raspberries, blackberries, and blueberries. Peaches and day-neutral strawberries appear to support SWD infestation, though damage was not as great as was found for raspberries and blueberries. Data for cherries was incomplete due to the spring freeze that destroyed crops on all but two of the cooperator's farms. By mid-August severe infestations were found and were reported across NY with timing of infestation development being rapid. Additional farms with raspberry and grape were added to the survey at this point. Across most farms, traps located in the wooded perimeter consistently captured the most adult SWD throughout the season. Traps within crops did not indicate an edge effect, or a noticeable shift from one crop to another. Trap captures did not provide an early indication for fruit infestation in time for spray intervention. Wild hosts including dogwood, bush honeysuckle, pokeweed and buckthorn supported large populations of SWD.