Sulfosulfuron Crop Safety – 2014

Research Summary Abstract

Since 2005 IR-4 has completed 192 trials with sulfosulfuron (Certainty 75WDG) on 79 plant genera or species. The data contained in this report was generated to register uses of sulfosulfuron on and around ornamental horticulture plants with over-the-top applications. The sulfosulfuron rates in the testing programs were 1.25, 2.5 and 5 oz product per acre (0.0586, 0.117, and 0.188 lb ai per acre) as the 1X, 2X and 4X rates. Two plant genera or species exhibited no or minimal transient injury after application at all three rates in 3 trials including  Gleditsia sp. and Hibiscus; however with the latter there may be a cultivar or species sensitivity. Five crops (Acer rubrum, Armeria maritima, Gazania sp., Lavandula angustifolia and Muhlenbergia capillaris) exhibited minimal or transient injury at the lowest rate but there was commercially unacceptable injury at the higher rates. For 26 crops, there was significant injury even mortality. For the remaining crops, more trials are needed to determine response.

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