Clumps of grass (or bad roots over winter?)
I have noticed areas of my lawn up to 3 sq ft where my grass is being pulled up very easily, even by a strong leaf blower. It looks like the roots have been eaten away, sort of like you might get with grubs in the summer. I did not have this problem at the end of the fall, I'm only seeing it now.
Are grubs active over the winter? Is there some other pest that can explain this loose grass? This is my 5th spring in this house and I never had this problem before, so it's hard to think that it is a natural part of getting over the winter. The winter in my area was milder than usual--not sure if that could be a factor.
I think I will have to reseed these areas, but I want to avoid the problem in the future.