California almond growers who use paraquat will see the herbicide phased out in the state after pesticide manufacturers voluntarily cancelled registrations for products containing paraquat-dichloride, according to the
California Department of Pesticide Regulation (DPR). While the announcement has been described in some places as a ban, DPR’s action is more accurately a voluntary cancellation by registrants following the state’s reevaluation process.
DPR announced the cancellations on August 10 after the manufacturers chose not to submit additional scientific data requested by the department. The decision starts with a transition period rather than an immediate stop in use, meaning products already in the distribution chain may continue to move through the system under existing rules.
How We Got Here
DPR initiated the reevaluation in November 2024 in response to language passed that year by the State legislature mandating that a review be completed by Jan 1, 2029. Based on that review, DPR asked registrants to provide studies addressing data gaps related to potential human health and ecological concerns. Rather than generating the additional data, manufacturers began cancelling California registrations in April 2026. The final cancellation was completed on August 6.
What It Means for Growers
DPR-licensed pesticide dealers may continue to possess and sell affected paraquat products for up to two years after each product’s effective cancellation date. Growers who buy those products, or already have them on hand, may use them until supplies are exhausted. Applicators should continue to treat paraquat like any other restricted-use pesticide by following the label, observing all safety requirements and keeping required application records.
Paraquat's Role in Almond Production
Although paraquat use as a post-emergence herbicide in almonds has declined, it remains an important weed management option for some operations. Its value is tied in part to its alternative mode of action, which can help growers manage weeds that are becoming harder to control with other herbicides. That role may be especially relevant as resistance issues continue to shape orchard weed-management decisions.
Looking Ahead
While some new herbicides are in the registration pipeline, it is uncertain when they will complete the EPA and CDPR registration processes. As remaining paraquat supplies decline, growers who rely on paraquat should begin evaluating alternative chemical and nonchemical weed-control strategies for their orchards. That may include reviewing current herbicide programs, mowing, rotating modes of action where appropriate, and improving application timing that fit individual orchard conditions.
