From 2007 to 2021, IR-4 completed 594 trials on Tower EC (dimethenamid-p). The data contained in this report was generated to register uses of dimethenamid-p on and around environmental horticulture plants with over-the-top applications. The dimethenamid-p rates in the testing program were 0.97, 1.94 and 3.88 pounds active ingredient per acre (lb ai per A) as the 1X, 2X and 4X rates. Tower EC had been applied to 154 plant genera or species. Of these, 74 plant species exhibited no or minimal transient injury after application at all three rates. Thirty (30) crops exhibited no phytotoxicity at 0.97 lb ai per acre but did have some injury at 1.94 and 3.88 lb ai per acre. Fifteen crops – Aquilegia sp, Catharanthus roseus, Cladrastis sp., Crassula ovata, Crassula sp., Echeveria sp., Echinacea purpurea, Echinacea sp, Epilobium canum, Helianthus annuus, Muhlenbergia dubia, Rudbeckia fulgida, Rudbeckia hirta, Teucrium chamaedrys, and Viburnum opulus – exhibited significant phytotoxicity at even the lowest rate.
Research Summary Abstract