An industry leader recommends this product to be applied in April/May for "season long control" of grubworms. But the 'fine print' explains this grubworm product is only good for 90 days or so. (We get their regular updates via email). Now they sent me another update saying that now is the best time to apply grubex (again???). We apply Merit in late June through early August with very fine results (got burned with Mach I the first year it was available -- many "breakthroughs"). Suggesting in early spring & "season-long control" -- then saying "summer" is the best time??? Any logical answers or opinions? (I have my own). Thanks!