CAPS Update: Spotted Wing Drosophila new

CAPS Update: Spotted Wing Drosophila Detected at More Sites During 2011 Orchard Survey

Orchard Commodity Survey sites for 2011. Star indicates
area where spotted wing drosophila was detected.
(Map by K. Watson, UDAF)

Spotted wing drosophila is a newly detected pest that could
severely impact Utah’s fruit industries.

Eight different tree fruits and six different berries are grown by at least 370 operations on approximately 7,000 acres in the state of Utah (NASS, 2006). There is a substantial risk that invasive insects will be introduced that could have a severe impact on Utah’s fruit industries, which yield over $14 million annually (NASS, 2006). The risk is amplified because many pests have multiple hosts that are present in Utah. If any of the pests were to become established, it would severely impact our fruit industries, which yield over $14 million annually (NASS, 2006).

In 2011, a survey for eight exotic species was conducted at 37 orchards and fruit stands. Spotted wing drosophila (Drosophila suzukii), a vinegar fly which was first detected in Kaysville in 2010, was targeted. Seven moth species were also targeted: European grapevine moth (Lobesia botrana), plum fruit moth (Cydia funebrana), light brown apple moth (Epiphyas postvittana), false codling moth (Thaumatotibia leucotreta), summer fruit tortrix moth (Adoxophyes orana), Egyptian cottonworm (Spodoptera littoralis), and old world bollworm (Helicoverpa armigera).

None of the target moth species were detected in any of the 2,043 samples. However, the traps yielded 51 spotted wing drosophila from three sites in Davis County. Unlike other vinegar flies, spotted wing drosophila is able to attack unripe fruit. Its repeated detection is of great concern and emphasizes the need for increased monitoring by those who grow fruit. More information on monitoring can be found on the USU fact sheet.

-Cory Stanley, USU CAPS Coordinator

CAPS (Cooperative Agricultural Pest Survey) is a federal program, administered jointly by USDA-APHIS-PPQ and each state, whose purpose is early detection of invasive species that could threaten U.S. agriculture. In Utah, the program is co-coordinated by Cory Stanley (USU) and Clint Burfitt (UDAF).


National Agricultural Statistics Service (NASS). 2006. Utah Fruit and Berry Survey. NASS, USDA, Salt Lake City, Utah. 35 pp.