Flumioxazin + Pyroxasulfone Crop Safety – 2018

Evergreen conifer with short tight needle-like leaves on twigs

Research Summary Abstract

IR-4 conducted fifty-one (51) trials evaluating two formulations of flumioxazin + pyroxasulfone: V-10233 76WG (37 trials) and V-10336 61.5WG (14 trials) for crop safety. The data contained in this report was generated to register the use of this active ingredient combination with directed spray applications around ornamental horticulture plants. The rates tested were 0.35, 0.71 and 1.42 pounds active ingredient per acre (lb ai per A) as the 1X, 2X and 4X rates.

V-10336 and V-10233 were applied to 31 plant species or genera. Six species or genera (Juglans nigra, Cornus spp., Pinus spp., Prunus spp., Quercus spp. and Salix spp.) exhibited no or minimal transient injury in 3 trials across both formulations. One species Cercis canadensis exhibited moderate injury at all rates and stunting at 2X in a trial with V-10336 61.5WG. One genera (Rhododendron sp.) exhibited variable injury (none, minor or significant) at all rates with good recovery. Further testing is required before a conclusion can be made confirming crop safety on these crops.

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