Male SWD marked blue
For a study of trapping invasive fruit flies in cherry orchards, researchers at Michigan State University marked thousands of spotted-wing drosophila (Drosophila suzukii) fruit flies with fluorescent dust, such as this male marked in blue. The flies were released in an orchard with a monitoring trap, and the recaptured flies were then examined and counted under ultraviolet light. (Photo credit: Danielle Kirkpatrick)