I have a property with a permanent grub problem. Since I am against pesticides I am trying to determine the best way to solve the grub problem. The "lawn" is full of potholes, weeds and st augustine. Grubs are everywhere and eat almost the whole lawn in the summer. The last time I had grub issues at another lawn I bulldozed the whole lawn and screened it, leaving grubs to bake in the sun and be eaten by birds. I did this once a week all summer, spraying vinegar everywhere to kill weeds. At the end of the summer and many siftings I no longer had grubs and added compost and mulch from the chipper throughout the winter. In February I planted the bermudagrass and had a great lawn for years. After about 7 years the grubs returned so I gave it the same treatment. One more trick that seemed to work was making a grub killer out of tobacco leaves. As far as I know the grubs are of june beetles, and I am not sure of there is a biological control for them.