I have seen a lot of turf lately that has absolutely no root system left. Last fall these lawns were fine, no grubs, chinch or sodwebworm but over the winter something happened. Any one else seeing this? The problem is more pronounced in partial shade lawns. the turf peels right off and there are no roots. I can not find any insects or even dead bodies of insects. No bird actvity in the spots either. These lawns are wrecked.