Note from the Fluoride Action Network:
Molecular structure for Sulfoxaflor (see more information)
On July 12, 2019, the U.S. Environmental Protection Agency (EPA) announced in a Decision Memorandum that it has registered new uses and restored previously registered uses for sulfoxaflor. EPA has approved the use of sulfoxaflor on alfalfa, corn, cacao, grains (millet, oats), pineapple, sorghum, teff, teosinte, tree plantations, and restored the uses on citrus cotton, cucurbits (squash, cucumbers, watermelons, some gourds), soybeans, and strawberries. EPA states that substantial data show that when sulfoxaflor is used according to the label, it poses no significant risk to human health and poses a lower risk to non-target wildlife, including pollinators, than other registered alternative products. EPA’s registration decision is available at www.regulations.gov in Docket Number EPA-HQ-OPP-2010-0889-0570.
EPA’s decision follows an opinion issued on September 10, 2015, by the U.S. Court of Appeals for the Ninth Circuit vacating EPA’s 2013 unconditional registration for the pesticide sulfoxaflor, and remanding the matter to EPA to obtain further studies and data regarding the effects of sulfoxaflor on bees and bee colonies. That decision is discussed in our blog item available here. In response to that decision, EPA also issued a cancellation order that included provisions for the disposition of existing stocks of sulfoxaflor products.
After the decision of the Ninth Circuit Court of Appeals, EPA reevaluated the data and on October 14, 2016, approved sulfoxaflor end-use registrations for limited uses that did not include crops that attract bees. EPA also has been granting emergency exemptions for sulfoxaflor since 2012, with the most recent emergency exemptions granted on June 17, 2019, for the use of sulfoxaflor to control tarnished plant bugs on cotton in 12 states, and to control sugarcane aphids on sorghum in 14 states.
In the July 12, 2019, decision adding new uses, restoring previous uses, and removing certain application restrictions, EPA states an unconditional registration under Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) Section 3(c)(5) for new uses of sulfoxaflor is backed by substantial data, including numerous pollinator studies submitted by the registrant, Dow AgroSciences (DAS). With specific regard to sulfoxaflor’s impact on bees, EPA states the following:
Since the vacatur in 2015, DAS has submitted numerous additional pollinator studies. The pollinator data requirements listed in 40 CFR 158.630 have all been submitted or waived. EPA’s risk assessment process for pollinators has evolved since those data requirements were promulgated and now EPA generally assesses risks to bees using a three-tier process based on a more robust data set as described in two guidance documents: “Guidance for Assessing the Risks of Pesticides to Bees” (USEPA 2014) and “Guidance on Exposure and Effects Testing for Assessing Risks to Bees” (USEPA 2016). For sulfoxaflor, all Tier I data have been submitted. Three additional Tier II semi-field (tunnel) studies and two colony feeding studies have been submitted. Pollen and nectar residue data have been submitted for multiple crops. The submitted data covers all of the requested use patterns. For those crops that did not have data specific to pollen and nectar residues, data was extrapolated as appropriate from other crops. All regulatory data requirements for assessing pollinators have now been addressed and the EPA has adequate data to demonstrate that there will be no unreasonable adverse effects to honey bees resulting from the expanded registration of sulfoxaflor.
EPA’s decision also removes previously imposed application restrictions:
- Removed the prohibition of use on crops grown for seed because EPA believes pollinator protection restrictions, including low use rates, will be in place regardless of whether the crop is grown for seed or for commodity harvest;
- Removed the restriction to post-bloom application for bee-attractive crops only when there is low risk or limited potential for exposure to bees;
- Removed the 12-foot buffer requirement because EPA believes the spray drift mitigation requirements on labels are adequate to limit drift; and
- Removed the 2016 restriction against tank mixing because EPA states data show that there is no additional risk when sulfoxaflor is tank mixed with other compounds.
EPA’s decision includes the following crop specific restrictions:
- Citrus: Only one application is allowed per year between 3 days before bloom and until after petal fall.
- Ornamentals: Only one application is allowed during bloom, and that bloom must not exceed a rate of 0.071 lb ai/acre.
- Pome Fruit, Stone Fruit, Tree Nuts and Pistachio: No application is allowed any time between 3 days prior to bloom and until after petal fall.
- Small Fruit Vine Climbing and Low Growing Berry, Tree Plantations: No application is allowed any time between 3 days prior to bloom and until after petal fall.
EPA found that the FIFRA standard for registration is met for the registration of sulfoxaflor on the uses approved, and that the benefits of these uses outweigh the risks, but also set specific label requirements including restrictions to minimize potential exposure to bees:
- Worker Protection: “Applicators and other handlers must wear: Long-sleeved shirt and long pants, shoes plus socks, protective eyewear” and “Do not enter or allow worker entry into treated areas during the restricted entry interval (REI) of” 24 hours (for Transform WG label) and 12 hours (for Closer SC label).
- Environmental Hazards Statement: “This product is highly toxic to bees and other pollinating insects exposed to direct treatment or to residues in/on blooming crops or weeds. Protect pollinating insects by following label directions intended to minimize drift and reduce pesticide risk to these organisms.”
- The RT25 (how long foliar residues of sulfoxaflor exhibit toxicity to honey bees): “The RT25 for this product is less than or equal to 3 hours.”
- Directions for Use: “Notifying known beekeepers within 1 mile of the treatment area 48 hours before the product is applied will allow them to take additional steps to protect their bees. Also, limiting application to times when managed bees and native pollinators are least active, e.g. 2 hours prior to sunset or when the temperature is below 50°F at the site of application will minimize risk to bees.”
This new decision by EPA may finally be the culmination of a long and convoluted process to register sulfoxaflor. The litigation that resulted in vacatur of the initial registrations began in 2013. At the time the Ninth Circuit issued its decision in 2015, vacatur was viewed by many observers as a novel and radical response to an EPA decision to register a new pesticide. Since that time, registrants and users of newly approved active ingredients have encountered more aggressive litigation in which vacatur is often cited as a possible remedy. This has created more uncertainty and concern about product availability, even after EPA approves an eagerly anticipated new product to meet a pressing pest control need. In the case of sulfoxaflor, EPA has clearly determined that the data submitted by DAS demonstrate that any risks to pollinators presented by sulfoxaflor will be less than the risks presented by currently registered insecticides sulfoxaflor is likely to replace. This determination concerning relative risk based on review of additional data should address the deficiencies in the EPA rationale found by the Court when it vacated the 2013 sulfoxaflor registrations.
Interestingly, the current EPA decision may raise a similar issue concerning the sufficiency of EPA’s rationale concerning the effects of sulfoxaflor on endangered species. EPA states the following in its Decision Memorandum:
EPA has not made an effects determination for sulfoxaflor. EPA is currently focusing most of its resources for assessing impacts to listed species on its registration review program for currently registered pesticides. EPA believes that, as a general matter, older pesticides present a greater degree of risk to listed species than most new chemistries, including sulfoxaflor, and that it is therefore environmentally preferable in most circumstances for EPA to assess the impacts of existing pesticides sooner in the process than newer pesticides that are designed to compete with more risky alternatives. EPA believes that is especially true for sulfoxaflor, where the alternatives include organophosphates, neonicotinoids and pyrethroids. As a result, EPA does not believe the environment or the public would be best served by delaying the registration of new uses for sulfoxaflor to complete consultation. Focusing the limited resources of EPA, the Fish and Wildlife Service and the National Marine Fisheries Service on completing a consultation on the effects of sulfoxaflor would by necessity come at the expense of putting more resources into evaluating – and consequently regulating, where appropriate – what EPA believes to be more toxic compounds, that, among other things, pose greater risk, to endangered species than does sulfoxaflor.
While it is clearly sensible for EPA and the Services to prioritize the limited resources available to make and to consult concerning effects determinations for endangered species by addressing existing pesticide classes that are likely to present the greatest risk before products with new chemistries that are intended to be more selective, it remains to be seen whether reviewing courts will be inclined to accept this type of rationale. In particular, it will be interesting to see whether the sufficiency of this approach to endangered species determinations becomes an issue in any future litigation regarding sulfoxaflor or other newly registered active ingredients.