By Stephen Robertson and Philip Rozeboom et.al
As of June 30, 2025, the labeled uses for chlorpyrifos products for food and feed are limited to alfalfa, soybean, and wheat (spring and winter) in South Dakota. Chlorpyrifos can no longer be used to treat sunflowers. This change was part of a regulatory amendment approved on September 30, 2024, which revoked all but 11 food and feed uses of chlorpyrifos.
The new regulation stipulates that all existing stocks of chlorpyrifos products with canceled or amended labels cannot be sold or used after June 30, 2025, regardless of intended use. Existing stocks should be stored according to label instructions until they can be properly disposed of. The SDSU Extension resource,
Source : sdstate.edu