Turfgrass - May/June Beetle Grubs

grub image maybeetle image grub damage image


Phyllophaga (May beetle or June beetle) grubs require three years to complete their life cycle. Adult May/June beetles are larger than masked chafers (5/8 to 7/8 inches) and range in color from tan to brown to almost black. Adults emerge from the soil in May and June and fly around lights at night. While adults do not attack turf, they do feed on foliage of a wide range of trees, shrubs, and other plants. Eggs are deposited in the soil and hatch in 3 to 4 weeks. Small grubs feed on grass roots during the first summer, moving down in the soil profile with the onset of cooler fall temperatures. Grubs return to the upper root zone in April or May, actively feed throughout the second growing season, then again move deeper in the soil to overwinter. In the third year, Phyllophaga grubs return to the root zone and feed until May or June, when they enter the pupal stage. Adults develop from the pupae late in the summer, but remain in the soil until the following May or June, which completes their life cycle.



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!