Site: European chafer tends to prefer dry or well drained soils. They feed through late summer and fall, not stopping until the ground freezes. Distant: Turf thins in patches in lawns or golf course roughs.
Photo by MSU Department of Entomology. Most European chafer grubs complete development in one year, but a small proportion of the population may require two years to complete development. Surviving grubs return to the surface as soon as the ground thaws, feeding on grass roots again in late winter and spring. Home lawns, golf courses, and turf growers have the potential to be most significantly impacted if the European chafer beetle were to become established in … By Sept. 1, nearly all grubs are second instar (0.5 inch long), and by Oct. 1, most of the larvae are mature, third instar grubs (0.75 to 1 inch long). Using insecticides: Use insecticides judiciously, temporarily, and only in response to unacceptable turf injury. The immature stage, or grub/larva, lives in the soil and eats grass roots. Chlorantraniliprole is a relatively new compound for grub control. Beetles emerge at dusk each evening and tend to congregate in trees for several hours. Larvae hatch from eggs in 10 days and begin to feed on the roots of turf.
This means that large numbers of them may be in an area and they would not be detected unless someone was looking for them. As they grow throughout the fall the damage will become more apparent. European chafer overwinters as a mature larva. - Eggs are deposited 2 to 4 inches below the soil surface on non-irrigated turf. Earlier this summer, many homeowners around the city of Sturgeon Bay noticed extensive damage to their lawn. The imago, or adult beetle, stage is quite short, lasting 1–2 weeks. The preventive grub compounds are systemic and are absorbed by the roots and moved throughout the grass plant. Turf damage caused by grub feeding injury to roots is most severe under drought conditions, when water-stressed grass plants cannot grow new roots to replace injured ones. Third instar grub. Michigan State University Extension programs and materials are open to all without regard to race, color, national origin, gender, gender identity, religion, age, height, weight, disability, political beliefs, sexual orientation, marital status, family status or veteran status.
By late May, almost all of the grubs move down to a depth of 2 to 10 inches to pupate. Mow lawns before spraying an insecticide for grubs to avoid leaving spray residue on the open flowers of weeds which are visited by bees. The battle has begun, but the outcome is not decided. European chafer overwinters as a mature larva. Eggs are laid from late June through July. Natural control of European chafer by predators, parasites and pathogens is excellent in Europe but poor in the United States. European chafer grubs may not be as susceptible to some insecticides as Japanese beetle grubs. There are a myriad of trade names that these active ingredients are in. The immature stage, or grub/larva, lives in the soil and eats grass roots. Of the products that are effective for grub control, they are either preventive (Chlorantraniliprole and Imidacloprid) or curative (Carbaryl and Trichlorfon).
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