Keith from Valrico writes
QuickSilver T&O Herbicide is not labeled for control alligator weed. This invasive plant is best controlled using triclopyr, glyphosate, or a few other select herbicides that can be very expensive. Unfortunately, we do not know of any herbicide that is labeled to control this plant that would not also harm St. Augustine turfgrass. Alligator weed is most often found in marsh areas or along waterways, so you generally will need to use an herbicide that is safe for use in aquatic areas.
Hi-Yield Killzall Aquatic is a good choice for smaller areas. AquaStar Herbicide would be good for larger areas. You should apply when most plants are flowering, and keep in mind that multiple applications may be required. You should also use a non-ionic surfactant with either of those herbicides for best results.
You can also read more about alligator weed in this article.
Answer last updated on: 05/12/2021
