One of my customers next door neighbours has patches all over his lawn of three quarter inch long grey/black worms, they are about 2mm round. There are thousands of them and the birds don't seem to be eating them. They're not leatherjackets as they are too small. Does anyone have any ideas - have Googled problem but most chemical controls for worms seem to be banned now and I wouldn't want to be putting stuff down as he has a dog and a young grandchild. Any pointers in the right direction would be great.