Spotted wing drosophila
Spotted wing drosophila (SWD), Drosophila suzukii, is an Asian fruit fly reported to have reached the mainland U.S. by 2008 and Montana in 2011. SWD has become a major economic threat to thin-skinned berry and stone fruit crops, particularly cherries. Females deposit eggs in fruit and the growing maggots feed and defecate in the fruit, making it unmarketable. SWD has a high reproduction rate and can produce over a dozen generations per season (CABI 2020).
MSU-WARC Monitoring Updates
WARC is monitoring first trapping dates for SWD. In 2020, the orchard at MSU Bozeman Horticultural Farm monitored from 8/6 - 10/20 with an incidence of one female and one male collected on 8/19 and 8/25, respectively. WARC in Corvallis monitored from 7/1 - 10/14 and recorded one male on 8/26/20 and one female on 10/7/20.
CABI. 2020. Drosophila suzukii (spotted wing drosophila). Invasive Species Compendium. Wallingford, UK: CAB International. https://www.cabi.org/isc/datasheet/109283.