Grub-Ex-when to treat lawn/garden?
I am not sure when to put grub treatment down on the lawn/garden areas(hopefully to eventually cut down numbers of Japanese beetles). I did so last fall in our own gardens, but now wish I had done so with our church garden, where I cannot be, in order to hand-pick JBs! They have made the 12 rose bushes there look horrendous! I don't want to go the trap route, as I know about the traps almost doing the opposite (calling JBs in).
If I put Grub-Ex down now, will it kill existing grubs, and will it have any effect on this summer's population?
Any other suggestions? I am so upset that the one place where I want the roses to look great...looks horrible!