Click on thumbnail to see larger view. The majority of images in this site are from the Key Gray collection at Oregon State University. The remainder are from the UI slide archives unless noted by individual photos. Beetles Caterpillars Mites Flies Leafhoppers Beetles and Grubs Bluegrass billbug Adults emerge in April and May and can be seen crawling along sidewalks. They are about 10mm long.
Adults feed on stems but cause no major damage.
Sprays can be applied to kill the adults before they lay adult their eggs. Billbug larva Larvae are c-shaped legless grubs that feed in the crowns during May and June and below ground in July and August. July to early August are the times of most damage. Damaged grass turns brown and dies. Wilted grass does not respond to watering.