Tag Archives: dithiopyr


OHP Fortress herbicide – Now registered in California!

OHP, Inc. is pleased to announce the California state registration of Fortress┬« Ornamental Herbicide. Fortress is now available for sale through authorized OHP distributors in California as well as in other states. Fortress is a unique combination of the active ingredients isoxaben and dithiopyr formulated on a user-friendly engineered granule that provides virtually no dust  Continue Reading »