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Title Phenology of spotted wing drosophila in the San Joaquin Valley varies by season, crop and nearby vegetation
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The spotted wing drosophila, first detected in California in 2008, has become a major insect pest in caneberries and sweet cherries, causing commercial crop losses. Managing it is challenging because it has many other hosts, including riparian and backyard fruit plantings, and it increases rapidly, with generations overlapping one another. In our study we monitored trap captures in two parts of the San Joaquin Valley, within sweet cherry orchards and in nearby locations. Captures of adult flies showed two main periods of activity — spring and fall — and low captures in the winter (except for citrus and evergreen riparian areas) and summer. On many occasions during the year, trap captures were higher outside of the cherry orchards than within them. Additionally, early in the season, when decisions about control programs are being made, the sex ratio of captured flies in cherries was strongly female-biased. The results suggest that during the weeks leading up to harvest growers should experiment by placing traps in different environments surrounding their orchards to determine SWD activity and potential pest pressure locally, and monitor for both male and female flies.

Haviland, David Robert
Farm Advisor
Entomologist and Pest Management. Advise in identification and control of Pest.
Caprile - Emeritus, Janet
Farm Advisor
Commercial fruit, nut, vine, vegetable, field, specialty crops
Rill, Stephanie
Staff Research Associate II
Hamby, Kelly
PhD Student
Grant, Joseph A
Farm Advisor, Emeritus
walnuts, cherries, olives, miscellaneous fruits; fruit crops, integrated pest management
Publication Date Jan 1, 2016
Date Added Feb 19, 2016
Copyright © The Regents of the University of California
Copyright Year 2016

Cherry growers are advised to monitor outside their orchards as well as within them, and to count both male and female flies in the traps.

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