Flumioxazin has been registered in the United States since 2003 for uses in and around ornamental plants in production nurseries and in landscapes. Between 2000 and 2013, the IR-4 Project has conducted 618 trials using three granular formulations (BroadStar 0.17G, BroadStar 0.25G and BroadStar 0.25G VC1604) and a wettable dry granular formulation (SureGuard 51WDG). This is the first summary across all the available data for these 4 formulations generated through the IR-4 Project.
Sixty-three plant species or genera exhibited no or minimal transitory phytotoxicity to applications of BroadStar G formulations. Of these, nine are not currently listed on the current BroadStar 0.25G label. It is recommended that these be added to the label. Sixteen crops exhibited significant damage after over the top applications of BroadStar G formulations at all tested rates. Of these, thirteen are not currently in the list of ‘Sensitive Species’ on the current BroadStar 0.25G label. It is recommended that these be added to the label.
Eleven plant species or genera exhibited no or minimal, transitory phytotoxicity to over the top applications of SureGuard 51WDG formulation; all these are already in the current label. Thirty-three crops demonstrated significant phytotoxicity at all tested rates of SureGuard 51WDG. If a list of ‘Sensitive Species’ is added to the current label, these crops could be included.