ArborSystems Terrier is a ready-to-use systemic antibiotic for palms, non-crop bearing ornamental trees and large woody shrubs providing seasonal suppression of a variety of diseases including bacterial leaf scorch, fire blight, yellows diseases, phloem necrosis, mycoplasmas, xylem-limited bacteria (Xylella fastidiosa, BLS) and some bacterial blight diseases. Preventative application is more effective than therapeutic treatment in trees showing disease symptoms. Late summer or early fall applications provide disease suppression the following season. Some diseases may require repeated yearly application. The active ingredient is Oxytetracycline hydrochloride. For more information, click here.