BT and Spinoside are the two best organic solutions. But this late in the year it's very difficult to spray since the worms are already deep within the buds, eating (and shitting up a storm, leading to mold). Depending on the size of your crop you have to inspect ever bud you can. Look for ANY sign of dying/wilted sugar leaf, and almost assuredly you'll find a worm. It's amazing how heathy a bud will look on the outside, only to be completed rotted out by worm shit. It can really be strain dependent, with some plants just getting completely decimated while neighboring strains less effected. And to really break your heart, the highest colas are the most effective. So spend as much time as you can inspecting the top buds, cut out the effective buds (if you don't remove the areas with the round turds, it'll just mold and spead, so don't skip on the removal). I know it's a real bummer, but it's a big problem that plagues a lot of outdoor growers and unless you have your plants covered, the worms are going to get their share.
