Bentazon Crop Safety- 2022

Marigold flower

Research Summary Abstract

Basagran T/O has been registered for several 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, 104 different crop species/genera were examined for over the top applications. Of these, Seventeen exhibited no or minimal transient injury after application at all three rates.

Thirty-five crops require further research because of unclear results. Fifteen crops exhibited no phytotoxicity at 1.0 lb ai per acre but did have some injury at the higher rates or with repeat applications. Thirty-six species exhibited phytotoxicity at even the 1.0 lb ai per acre rate.

Link to Summary: Bentazon Crop Safety Summary