07/17/2025
The dreaded Japanese beetles have been having a feast on my zinnias. 😡 Here is what you should do if you see a beetle with white eggs on their back!
Japanese beetles, an invasive species in Minnesota, become more active from late July through August. These beetles are destructive to plant life, feeding on the leaves, flowers, and fruit of over 300 plant species.
As you spot them in your garden or neighborhood, take a closer look - some may have tiny, white eggs stuck to their backs. These are the eggs of the winsome fly, a parasitoid insect introduced as a biocontrol for Japanese beetles. When the eggs hatch, the larvae enter the beetle and eventually kill it, helping to reduce beetle numbers over time.
See a beetle with eggs? Take a photo and report it to iNaturalist to support research and monitoring! For more information, visit: https://z.umn.edu/ParSciTIPS
© Brett Ortler, CC BY 4.0