Research Summary Abstract
From 2007 to 2017, IR-4 completed 528 trials on Tower EC (dimethenamid-p). The data contained in this report was generated to register uses of dimethenamid-p on and around ornamental 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, 63 plant species exhibited no or minimal transient injury after application at all three rates. Twenty one (21) 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. Nine crops – Aquilegia sp., Catharanthus roseus, Cladrastis sp., Echeveria sp., Echinacea sp., Epilobium canum, Muhlenbergia dubia, Teucrium chamaedrys and Viburnum opulus – exhibited significant phytotoxicity at even the lowest rate.