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by Pat Hastings
Note: The official notice can be viewed at in the March 15, 2024 Plant and Pest Advisory or check
out the EPA Chlorpyrifos website highlighted below for more details.
For growers, this notice reaffirms that, at this time, all the chlorpyrifos tolerances have been
reinstated and are currently in effect, and products can be used according to the product label.
Additionally since use of existing stocks of Chlorpyrifos 4E AG, Quali-Pro Chlorpyrifos 4E, and
Vulcan on food, food processing sites, and food manufacturing sites is now permitted until June 30,
2025, it is probable that chlorpyrifos products can be used according to the product label for the
2024 growing season.
HOWEVER, EPA has published its next anticipated steps. Specifically, EPA has published that it
“expects to expeditiously propose a new rule to revoke the tolerances associated with all but the
11 uses referenced by the court… and …EPA is also engaged in discussions with the registrants
to further reduce exposures associated with the 11 uses of chlorpyrifos that were referenced by
the Eighth Circuit, a process that will also include taking into account the 2020 draft document and
public comments received thereto. This approach would allow use on alfalfa, apple, asparagus,
cherry (tart), citrus, cotton, peach, soybean, strawberry, sugar beet, wheat (spring), and wheat
(winter) with additional restrictions for geographic location and rate of application to address safety
of the tolerances, as well as potential additional restrictions to protect farmworkers and other
vulnerable populations, and vulnerable species and their habitats.”
Source: EPA Chlorpyrifos website.
To check on the status of tolerances for chlorpyrifos, please directly consult § 180.342 Chlorpyrifos;
tolerances for residues.