One male spotted wing drosophila (circled) and 3 non SWD. Trap from Davidson County, NC. Photo: HJB |
Site | Date of first capture | Total flies to date |
Davidson County, NC | 8/24/2010 | 19 |
Edgecombe County, NC | 7/30/2010 | 1 |
Lexington County, SC (Site 1) | 7/30/2010 | 6 |
Lexington County, SC (Site 2) | 8/6/2010 | 19 |
Spartanburg County, SC | 8/13/2010 | 4 |
Saluda County, SC | 7/2/2010 | 5 |
Randolph County, NC | 7/27/2010 | 9 |
Montgomery County, NC | 8/11/2010 | 17 |
In addition to SWD, several other flies have been caught in the traps, many of which can be confused with SWD. The image above includes 1 male SWD with clearly visible wing spots (circled) and 3 other flies which could be confused with SWD. The image below notes the key characters to distinguish between these 3 flies.
Also found in yellow sticky traps have been flies with 3 spots on each wing (below).
Drosophilid fly with 3 wing spots (indicated by blue boxes). Photo: HJB |
In addition to flies which may potentially be confused with male SWD, there are also flies which may be difficult to distinguish from female SWD. The most important female feature is the prominent ovipositor (below). The ovipositor can be hard to distinguish when insects are on yellow sticky traps, but can be teased out and still appears different than that of any other female fly.
SWD ovipositor. Fly captured in Edgecombe County, NC. Photo: HJB |
Female SWD on yellow sticky trap, ovipositor indicated by blue box. Photo: HJB |
Non SWD females. Note much smaller ovipositors that lack dark marginal teeth (click to enlarge). Photo: HJB |
More information
Washington State University SWD ID Guide
Sponsored by the Southern Region Small Fruit Consortium, Project 2010 E-01.
Sponsored by the Southern Region Small Fruit Consortium, Project 2010 E-01.
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