European chafer beetles and lawn damage

the beetle

wikimedia commons

wikimedia commons

the damage

Storm/CreativeCommons

Storm/CreativeCommons

Storm/CreativeCommons

^^replace larger pieces of turf and rake up the rest. Best approach is to let the birds and other predators clean out the larvae, then rake, add top dressing and sow grass seed.
Nematode treatments are only mildly successful and chemical insecticides are undesirable .
Vancouver Sun article
BC Gov/Ministry of Agriculture info page