Saturday, May 31, 2014
European chafer larvae can easily be identified using a 10X hand lens to inspect the raster pattern (shown above). Once established these insects may require some special attention going forward as they tend to be more damaging and somewhat less susceptible to traditional insecticide treatments. The best control is achieved using a preventive approach with applications of imidacloprid, thiamethoxam, clothianidin or chlorantraniliprole applied June through mid-July. Keep records of any European chafer infestation so you can identify areas to watch down the road.
Doug Richmond, Turf Entomologist