Abstract
Plants of ten woody shrub species, euonymus, winter jasmine, spirea, golden privet, crape myrtle, forsythia, hydrangea, redbud, viburnum, and weigela, and two bedding plant species, marigold (annual) and dianthus (perennial), were sprayed over the top with sulfosulfuron, trifloxysulfuron-sodium, or halosulfuron-methyl at two times the label rate or sulfosulfuron was sprayed over the top with the label rate and then sprayed with the label rate 30 days later to determine phytotoxic effects of the herbicides. All of the sulfonyl urea herbicides tested were safe to use on euonymus, but none should be used on redbud, weigela, spirea, or crape myrtle. Trifloxysulfuron-sodium typically caused more phytotoxicity on all species tested except euonymus, while halosulfuron-methyl was least likely. Sulfosulfuron also should not be used on privet, hydrangea, or winter jasmine.
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