Turfgrass - Masked Chafer Grubs

grub image adult beetle grubs in soil


Annual white grubs, Cyclocephala spp., complete their life cycle in one year. Adults are tan, about 5/8 inch long, and have a dark, mask-like marking over the eyes. Adults are normally present from late June through July. They are highly attracted to lights, and are frequently observed around windows or porch lights. Adult masked chafers do not injure turf or other vegetation.

Masked chafer beetles deposit eggs in the top 2 inches of soil, often in small clusters. Small grubs hatch during late July and early August and immediately begin feeding on grass roots. Most damage occurs in late summer and early fall after the grubs have reached the second and third larval stages. With the onset of cold weather, grubs move deeper in the soil to overwinter. As soil temperatures warm in the spring, they return to the root zone, feed for a brief period, pupate, and emerge as adults to begin a new cycle. Spring feeding is not as destructive to turf as late summer and fall feeding. Consequently, spring treatments are rarely required.


Breaking Entomological News...

  • Congratulations to all of our student winners at the ESA National Meeting - Andrea Rilaković, 1st Place Undergrad Virtual Poster, Sajjan Grover, 2nd Place Grad Infographic, Jeffrey Cluever, 2nd Place Grad Infographic, Earl Agpawa, 2nd Place Undergrad Poster, Timothy Dang, 2nd Place Grad Poster, Annie Krueger, 1st Place Grad Poster and 1st Place 3-Minute Competition, Jordy Reinders, 1st Place Oral paper, Gabriela Carmona, 2nd Place Oral paper, Molly Darlington, 1st Place Oral paper, and Kelly Willemssens (SNR student), 2nd Place 3-Minute Competition. The group came in second in the number of awards won by one department.
  • Dr. Joe Louis receives the Early Career Innovation award from the Entomological Society of America
  • Congratulations to Dr. Troy Anderson on being elected Vice President Elect for the Physiology, Biochemistry, and Toxicology Section of the Entomological Society of America!
  • Scott O’Neal (NIFA Postdoctoral Fellow with Troy Anderson) was recognized as the 2019 New Investigator of the Year by the American Chemical Society AGRO Division. Congratulations, Scott!
  • Dr. Kyle Koch named new insect diagnostician
  • Check out the Emerald Ash Borer Resource Center, and our Emerald Ash Borer Look-Alike Insects Sheet - Be Sure Before You Treat!