DESCRIPTION: Dow AgroSciences' Trellis herbicide contains the active ingredient isoxaben and is the only herbicide used in grapes with a cellulose biosynthesis inhibitor mode of action. It provides pre-emergent control of 92 broadleaf weeds, including fleabane, marestail, malva, clover, morningglory and willowherb. It is labeled for bearing and non-bearing grapes. Isoxaben has been used in non-bearing grapes since 1998 and has proven to be one of the safest herbicides available in non-bearing grapes and tree crops.