Underground, grubs feed on the roots and from above, a variety of insects can cause additional damage. TURF LINE Arthroban with Mallet effectively controls grubs all season long. Arthroban with Mallet also controls European Crane Fly larvae, mole crickets, cutworms and chinch bugs. Best time to treat for grubs is Mid July to Late August, for European Crane Fly best time to treat is late September or early October.