happ - We did put down milky spore a couple of years in a row but haven't for a few years. If I remember correctly, I think you put the stuff down in late summer. Theoretically, once it's in the soil, you shouldn't have to put it down again. I wonder how far the JBs fly after mating to lay eggs. Bet it wouldn't be too far. Maybe chose a few areas - not the whole 5 acres - where they've concentrated their destruction?