Well maybe they are few days early. We (Michael Brownbridge and his gang and my summer student Emily Hartwig) finished off a grub trial yesterday and found some June beetle adults wandering around aimlessly in the turf. I also have received a few phone calls reporting lots of adult June beetle in flight in the Greater Toronto Area on golf courses. They are providing a good food source for the birds on the golf courses. Follow the link to the OMAF “Grubs in Lawns” factsheet to review their 3 year life cycle http://www.omafra.gov.on.ca/english/crops/facts/08-023w.htm
Peak damage from June beetles flying around now and laying eggs will be evident in June and July 2015, so be on the watch. Unfortunately, there are no insecticides registered for use on June beetle grubs in Ontario.