Bentazon Crop Safety Summary – 2019

Hydrangea flower

Research Summary Abstract



Basagran T/O has been registered for a number of years as a directed application and as an over-the-top application on limited plant species. However, growers have expressed the need to have additional plants added for over-the-top applications. Data collected throughout the history of the IR-4 Environmental Horticulture Program are presented here to support specific Basagran T/O applications over the top of certain ornamental horticulture plants. The rates chosen for this research were 1.0, 2.0 and 4.0 pounds active ingredient per acre (lb ai per A) as the 1X, 2X and 4X rates. In addition, early studies compared single versus two consecutive applications of 1.0 lb ai per A or 2.0 lb ai per A followed with 1 lb ai per A. Throughout the years, 83 different crop species were examined for over the top applications. Of these, 21 exhibited no or minimal transient injury after application at all three rates. Twenty-eight crops require further research because of unclear results. Twelve crops exhibited no phytotoxicity at 1.0 lb ai per acre, but did have some injury at the higher rates or with repeat applications. Twenty-three species exhibited phytotoxicity at even the 1.0 lb ai per acre rate.

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