Key takeaway
What This Development Means
The Environmental Protection Agency (EPA) has issued an emergency order to immediately suspend all pesticide products containing dimethyl tetrachloroterephthalate (DCPA), also known as Dacthal, due to significant health risks. The suspension follows evidence linking DCPA to thyroid hormone disruptions in foetuses, which can cause long-term developmental issues such as impaired brain development and reduced motor skills. The EPA determined that these risks, particularly to pregnant women and their unborn children, outweigh the agricultural benefits of the chemical. The suspension will remain in place until a formal cancellation process is completed, expected to take up to 18 months. The EPA urges affected growers to adopt alternative pest management strategies in light of the suspension.
What are the specific health risks associated with DCPA that led to the EPA's emergency suspension?
The primary health risk associated with DCPA is its potential to disrupt thyroid hormone levels in fetuses when pregnant women are exposed to the pesticide. This disruption can result in serious long-term developmental issues for the child, including impaired brain development, reduced motor skills, decreased bone density, and low birth weight. These effects may not be immediately apparent at birth but can have lasting consequences throughout the child’s life. Due to the severity of these risks, the EPA determined that the continued use of DCPA poses an imminent hazard, particularly to vulnerable populations such as pregnant women and their unborn children.
What should manufacturers, distributors, and users of DCPA do in response to the EPA's suspension order?
In response to the EPA's emergency suspension, manufacturers and distributors must immediately cease the sale, distribution, and offering of DCPA products. They are also required to facilitate the return of existing stocks from users and distributors. Users of DCPA, including farmers and agricultural workers, must stop using the product immediately and find alternative pest management solutions. The EPA has emphasized that no further application of DCPA is permitted, and any remaining stocks should be returned to the product's registrant. Additionally, stakeholders should stay informed about the ongoing cancellation process and any further instructions from the EPA.
The Environmental Protection Agency (EPA) has issued an Emergency Order to suspend all registrations for pesticide products containing dimethyl tetrachloroterephthalate (DCPA), also known as Dacthal. This action comes in response to findings indicating significant health risks associated with DCPA exposure, particularly concerning thyroid hormone perturbations in foetuses.
Immediate Suspension Of DCPA
The EPA has determined that the continued sale, distribution, or use of DCPA poses an imminent hazard that requires immediate suspension to prevent serious health risks. This decision is based on evidence showing that DCPA exposure can disrupt thyroid hormone levels in foetuses, potentially leading to low birth weight, impaired brain development, and long-term motor skill issues in children exposed in-utero.
Details Of The Suspension
Effective immediately, the EPA's order halts the registration of all DCPA-containing products, which include:
Dacthal Flowable HerbicideDacthal W-75 HerbicideTechnical Chlorthal Dimethyl
This suspension prohibits any sale, distribution, or use of these products. The EPA has also disallowed the use of existing stocks to mitigate risks during the suspension hearing period.
Health Risks And Evidence
The catalyst for this suspension stems from a series of studies, particularly a Comparative Thyroid Assay (CTA) conducted in 2021. The study revealed that even low levels of DCPA could significantly alter thyroid hormone levels in foetal rats. Human exposure estimates suggest that current levels of DCPA use might exceed safe thresholds, especially for pregnant individuals.
Economic And Agricultural Impact
While DCPA is widely used for preemergent weed control in Brassica vegetables and Allium crops, the EPA's analysis indicates that the health risks outweigh the economic benefits of continued use. Alternatives to DCPA, such as bensulide and trifluralin for Brassicas and pendimethalin for Alliums, are available, although they may increase costs and require more labour for weed control.
Regulatory And Legal Framework
The suspension is issued under the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA), granting the EPA authority to take such emergency actions. Registrants, like AMVAC Chemical Corporation, can request a hearing to challenge the suspension, but the EPA's order remains effective during any proceedings.
Next Steps For Stakeholders
The EPA has notified the sole registrant, AMVAC Chemical Corporation, and any affected parties of the suspension. The agency is also preparing a notice of intent to cancel DCPA registrations within the next 90 days. Stakeholders can access more information and submit comments via the docket on the EPA’s official website.
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