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EPA Seeks Comment on its Risk Assessment Methodology for Evaluating Potential Synergistic Effects of Pesticides on Non-Target Organisms
On September 9, 2019, the U.S. Environmental Protection Agency (EPA) Office of Pesticide Programs (OPP) published a notice in the Federal Register announcing the availability of, and an opportunity for comment on, a document describing an “interim process” that OPP’s Environmental Fate and Ecological Effects Division is currently using to evaluate potential synergistic effects of mixtures of pesticide active ingredients on non-target organisms. As part of a lawsuit challenging the 2012 decision by EPA to register Enlist Duo Herbicide (a combination of 2,4-D and glyphosate), OPP scientists learned that patent applications for some registered pesticide products included claims that particular combinations of active ingredients provide “synergistic” control of target species. Although EPA was not at that time considering potential synergies in assessing the risk for ecological effects on non-target organisms, based on the patent application claims regarding synergy for Enlist Duo, EPA decided to request that the reviewing court vacate its registration decision and remand the application for Enlist Duo for further study of these effects and any measures that might be needed to mitigate the risk to non-target organisms. This decision sparked much controversy, and many in industry were concerned that patent application claims were not being correctly interpreted by EPA for the category of pesticide products at issue.
The new document released by EPA for review and comments is entitled: “Process for Receiving and Evaluating Data Supporting Assertions of Greater Than Additive (GTA) Effects in Mixtures of Pesticide Active Ingredients and Associated Guidance for Registrants.” EPA states that it “has generally been applying this interim process since 2016.” The process described in the document has five steps: (1) registration applicants must search for any granted patents that include synergy (GTA) claims for combinations of pesticides; (2) applicants must review the patent claims and supporting data for relevance to ecological risk assessment; (3) applicants must report to EPA all effects testing data from the relevant patents; (4) applicants must do a statistical analysis (using a method prescribed by EPA) to determine whether any observations of GTA effects are statistically significant; and (5) EPA will review all submitted information to decide whether it should be utilized in ecological risk assessment.
In the Federal Register notice, OPP lists five specific areas pertaining to the interim risk assessment process described in the document on which it is requesting comment:
When the National Research Council (NRC) evaluated the importance of toxicological interactions between pesticide active ingredients in 2013, the NRC concluded that such interactions are rare, but that EPA should nonetheless consider such interactions when the best available scientific evidence supports such an evaluation. In the current Federal Register notice, EPA makes it clear that it is uncertain concerning the utility for risk assessment of the information used by manufacturers to support synergistic effects claims in pesticide patents. According to EPA, 24 applicants for new registrations have submitted patent data to date, but only three of these submissions contained information that indicated a need for further testing and no submission ultimately led to any adjustment of the ecological risk assessment. At this juncture, EPA will continue collecting patent data that may be pertinent to GTA effects, but when it has sufficient experience upon to base a general policy it may either continue or improve this process or discontinue it after explaining why.
When EPA requested that the reviewing court vacate and remand the registration EPA had granted for Enlist Duo, the parties seeking judicial review located data in the patent applications that EPA had not previously seen or reviewed and that EPA believed could possibly be pertinent to potential adverse effects on non-target plants. EPA concluded that it should revisit the decision based on the additional data. Although EPA decided to request vacatur and remand, the applicant Dow AgroSciences had arguably followed all of the procedures then in place, because FIFRA Section 3(c)(5) allows EPA to waive data requirements pertaining to efficacy, and EPA typically registers pesticide product that are not intended to protect public health without any independent evaluation of efficacy data. Nevertheless, in general EPA may choose to evaluate pesticidal efficacy data; such circumstances in the past often involved cases where EPA was required to consider whether pesticide benefits are sufficient to outweigh identified risks. In the Enlist case, EPA determined that it should do so where potential synergy in pesticidal efficacy is pertinent to evaluating ecological effects on non-target species.
What EPA must decide now is how often efficacy data that has been deemed adequate by the Patent and Trademark Office to support a patent for a new pesticide mixture will have any material significance in the context of ecological risk assessment. Before EPA makes a determination whether or not patent data has sufficient pertinence to continue requiring routine collection and evaluation of such data, EPA has decided it is prudent to afford all stakeholders an opportunity to comment on whether EPA has been asking the right questions.
All comments on the draft document must be submitted no later than October 24, 2019.
On September 4, 2019, the U.S. Environmental Protection Agency’s (EPA) Office of Pesticide Programs’ Environmental Fate and Effects Division (EFED) announced that the next Environmental Modeling Public Meeting (EMPM) will be held on October 16, 2019. The EMPM is a semi-annual public forum for EPA, pesticide registrants, and other stakeholders to discuss current issues related to modeling pesticide fate, transport, and exposure for risk assessments in a regulatory context.
In a press release to the public, EPA indicates that the topics covered at the October meeting will include sources of usage data (relating to the actual application of pesticides, in terms of the quantity applied or units treated); spatial applications of usage data; model parameterization; extrapolation of usage data to fill in gaps; temporal variability of usage; and updates on ongoing topics. Presentations concerning the incorporation of pesticide usage data into environmental exposure and ecological risk assessments will also be included.
Registration is required. Requests to participate in the meeting must be received on or before September 23, 2019, as noted in the Federal Register notice.
On August 28, 2019, the U.S. Environmental Protection Agency (EPA) released the Frequently Asked Questions (FAQ) web resource for the Series 810 – Product Performance Test Guidelines: Antimicrobial Efficacy Test Guidelines. As of August 28, 2019, efficacy testing should be in compliance with the following Product Performance Test Guidelines published by EPA in February 2018:
The guidelines provide recommendations for the design and execution of laboratory studies to evaluate the effectiveness of antimicrobial pesticides against public health microbial pests. 83 Fed. Reg. 8666. EPA states that these FAQs “provide prompt and transparent guidance to all applicants regarding commonly asked questions concerning the 810 guidelines updated in February 2018.”
With the exception of confirmatory testing (as described under OCSPP guideline 810.2000, Section (B)(7)), all studies initiated on or after August 28, 2019, should be in compliance with the 2018 revised guidelines for testing. The study initiation date is defined under 40 CFR Part 160.3 as the date the protocol is signed by the study director. Studies that were initiated prior to the implementation date but submitted to EPA for review after the implementation date may use either the previous 2012 version of the guidelines or the 2018 revised guidelines, as appropriate. EPA states that it “intends to address confirmatory testing through a separate guidance, which will be made available for public comment prior to finalization.”
The FAQs include general testing questions and questions related to each specific guideline. The appendices to the FAQs include examples of label use-directions for dilutable products, repeat testing guidance with example scenarios, and sample virucidal calculations.
There has been some concern in the regulated community regarding the need for clarification on the guidelines before they became effective. EPA’s new FAQs are intended to provide these clarifications, but the timing of their issuance may be of concern to some. Also of interest is whether additional FAQs will be issued in the future.
On August 26, 2019, the National Institute of Environmental Health Sciences (NIEHS) announced that the results of an NIEHS-funded study show that graphene could provide alternatives to chemicals in insect repellant and protective clothing. The study, “Mosquito Bite Prevention through Graphene Barrier Layers,” was published in the Proceedings of the National Academy of Sciences. According to the abstract, the researchers hypothesized that graphene films may provide mosquito bite protection for light, fiber-based fabrics. The researchers investigated the fundamental interactions between graphene-based films and the mosquito species Aedes aegypti through a combination of live mosquito experiments, needle penetration force measurements, and mathematical modeling of mechanical puncture phenomena. The abstract states that “the results show that graphene or graphene oxide nanosheet films in the dry state are highly effective at suppressing mosquito biting behavior on live human skin. Surprisingly, behavioral assays indicate that the primary mechanism is not mechanical puncture resistance, but rather interference with host chemosensing.” The researchers propose that the interference is “a molecular barrier effect that prevents Aedes from detecting skin-associated molecular attractants trapped beneath the graphene films and thus prevents the initiation of biting behavior.” According to the abstract, placing water or human sweat on the external film surface circumvents the molecular barrier effect. In this scenario, the abstract states, “pristine graphene films continue to protect through puncture resistance -- a mechanical barrier effect -- while graphene oxide films absorb the water and convert to mechanically soft hydrogels that become nonprotective.”
On August 27, 2019, the U.S. Environmental Protection Agency (EPA) published a proposed rule in the Federal Register that makes several changes to the current “Crop Group 19: Herbs and Spices Group.” This latest proposal, which is the fifth in a series of crop group amendments, was created in response to a petition developed by the International Crop Group Consulting Committee (ICGCC) workgroup that was submitted by the Interregional Research Project Number 4 (IR-4). The goals of the crop group amendment program include reducing regulatory burden, coordination with international definitions, and removing barriers to trade. The major components of this proposal are revision of the commodity definition for marjoram; addition of three new commodity definitions for basil, edible flowers, and mint; and replacement of the existing “Crop Group 19: Herbs and Spices Group” with two new crop groups, “Crop Group 25: Herb Group” and “Crop Group 26: Spice Group.” Recognizing that the existing combined Crop Group 19 Herb and Spice Group has limited the establishment of crop group tolerances, EPA has proposed creating the two new separate crop groups to benefit herb and spice growers. The new crop groups are quite large, containing 317 herb commodities in Crop Group 25 and 166 spice commodities in Crop Group 26. The proposal specifies all commodities in the new crop groups (and the subgroups therein, i.e., 25A and 25B for fresh herbs and dried herbs) and provides updated representative commodities for each crop group and subgroup.
The Federal Register notice requests that comments on the proposal be submitted on or before October 28, 2019. The public can submit comments at www.regulations.gov in Docket Number EPA-HQ-OPP-2006-0766.
On August 23, 2019, the U.S. Environmental Protection Agency (EPA) issued a Federal Register notice announcing the receipt of 10 applications to amend currently registered pesticide products to add hemp as a new use site. The 10 application amendments are the result of the 2018 Farm Bill, signed in to law on December 20, 2018, that removed hemp from the Controlled Substances Act and legalized commercial use and production of hemp that contains less than 0.3% tetrahydrocannabinol (THC).
EPA states in the notice that Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) Section 3(c)(4) does not require EPA to provide notice and opportunity to comment concerning these 10 applications because hemp falls within the terrestrial outdoor and residential outdoor use pattern previously approved for the pesticidal active ingredients in question, and approval of the applications would therefore not involve "a changed use pattern." Instead, EPA states that it has decided to provide an opportunity to comment in this instance "because of the potential significant interest from the public" and to be "completely transparent about these applications." EPA also states that it does not intend to provide notice or opportunity to comment for similar applications to add hemp that are likely to be submitted in the future.
EPA also states that the products with requested label amendments contain active ingredients for which EPA "has previously determined the residues will be safe under any reasonably foreseeable circumstances." Each active ingredient has an established tolerance exemption for residues on all raw agricultural or food commodities.
The 10 products for which EPA has received an application to add hemp are:
Once public comments are received, EPA anticipates making its decision on adding hemp as a new use site on the specific products before the end of 2019, so that these products may be available for the 2020 growing season.
Although the Federal government has legalized commercial production and use of hemp (as opposed to marijuana that contains higher levels of THC), not every State has changed its laws to conform to the new classification. EPA took the unusual step of announcing receipt of the new amendment applications at Hemp Production Field Day at the University of Kentucky. Senator Rand Paul of Kentucky has long been a proponent of commercial hemp production, and about 1,000 growers in Kentucky now have licenses to grow hemp for commercial use.
As hemp production increases, there will also be increased demand for pesticides to combat weeds, insects, and plant diseases that pose a potential threat to this crop. Although hemp fiber and oil have many potential industrial uses, hemp also has potential medicinal uses because extracts containing cannabidiol (CBD) are now being widely marketed for their purported health benefits. This use of hemp means that EPA will have to consider whether new tolerances may be required for some active ingredients before they can applied to hemp. As EPA has noted, the active ingredients in the 10 products for which EPA announced that applications are pending to add labeling for hemp already have tolerance exemptions, and therefore do not present this issue.
Comments are due on or before September 23, 2019. The public can submit comments at www.regulations.gov in Docket Number EPA-HQ-OPP-2019-0369.
EPA Announces FIFRA SAP Public Meeting to Consider Approaches for Incorporating Surface Water Monitoring Data in Pesticide Risk Assessments and Requests Nominations of Ad hoc Expert Reviewers
On August 13, 2019, the U.S. Environmental Protection Agency (EPA) published a notice in the Federal Register announcing a four-day meeting of the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) Scientific Advisory Panel (SAP) will be held November 19-22, 2019. The meeting location will be announced in the future on the FIFRA SAP website. The title of the SAP meeting is “Approaches for Quantitative Use of Surface Water Monitoring Data in Pesticide Drinking Water Assessments.” Pesticide registrants have long advocated for the opportunity to use monitoring data in drinking water assessments in place of estimates generated using current modeling approaches. It is expected that EPA will present work that the Environmental Fate and Effects Division (EFED) has completed to permit use of surface water monitoring data.
The Federal Register Notice also requests nominations for ad hoc reviewers with particular expertise related to the particular issues to be addressed by this panel. Nominations are to be submitted on or before September 12, 2019.
California DPR Issues Cancellation Notices for Chlorpyrifos, and Establishes a Work Group to Recommend and to Develop Alternatives to Chlorpyrifos
On August 14, 2019, the California Department of Pesticide Regulation (DPR) issued cancellation notices to thirteen California registrants of pesticide products containing chlorpyrifos, including Dow Agrosciences LLC (now Corteva). Each of these notices is referred to as an "Accusation," and each affected registrant has 15 days to request a hearing concerning the proposed cancellation. DPR's issuance of these notices followed a final decision by the U.S. Environmental Protection Agency (EPA) to deny an administrative petition to revoke the tolerances and cancel the U.S. registrations for chlorpyrifos. DPR states: "Despite the Trump administration's reversal of a decision to ban the pesticide at the federal level, California continues to move forward to protect public health, workers, and the environment." Although it is unusual for a State to act unilaterally to cancel a State registration for a pesticide that is still registered under the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA), FIFRA Section 24(a) provides that States may separately regulate Federally registered pesticides so long as they do not purport to authorize any sale or use that is otherwise prohibited under FIFRA.
The risk assessment that supports DPR's proposal to cancel chlorpyrifos products is based on five animal studies published in 2016, 2017, and 2018, that report neurotoxicity from chlorpyrifos at exposure levels that are considerably lower than the levels that cause acetylcholinesterase inhibition. Based on its evaluation these studies, DPR has concluded that developmental neurotoxicity is the critical endpoint for chlorpyrifos and has derived a point of departure for chlorpyrifos risk assessment. Based on this assessment, DPR previously concluded that chlorpyrifos should be designated as a Toxic Air Contaminant (TAC). DPR presented its TAC findings to California's Scientific Review Panel at a meeting on July 30, 2018, and the Panel subsequently concluded that the DPR assessment of the developmental neurotoxicity of chlorpyrifos was "based on sound scientific knowledge, and represents a balanced assessment of our current scientific understanding."
On the same day DPR issued its cancellation notices for chlorpyrifos, DPR also announced it has established an Alternatives to Chlorpyrifos Work Group with experts from "agriculture, California universities, environmental justice groups, farmworker health and safety organizations, and pesticide manufacturers…" DPR has asked this Work Group to develop short-term practical alternatives to chlorpyrifos, along with a five-year action plan. The Work Group is supposed to conclude its work by the spring of 2020. The budget for 2019-2020 approved by the California Legislature also includes $5 million in grant funding to develop sustainable alternatives to chlorpyrifos.
The DPR decision to cancel chlorpyrifos relies primarily on new animal studies that report that chlorpyrifos causes neurodevelopmental effects at levels that are well below those that inhibit cholinesterase. DPR refers in passing to the epidemiology studies for chlorpyrifos that EPA used to make its Food Quality Protection Act (FQPA) determination for all organophosphate (OP) pesticides, but these data were not used by DPR to derive its point of departure for chlorpyrifos risk assessment.
EPA scientists have not yet prepared a formal evaluation of the new animal studies for chlorpyrifos, but EPA's decision to deny the petition to revoke tolerances and cancel registrations for chlorpyrifos states that EPA intends to evaluate the new animal studies as part of its registration review deliberations for chlorpyrifos. The FIFRA registrations for chlorpyrifos may also be affected by pending judicial actions challenging EPA's decision to deny the petition to revoke the tolerances and cancel the registrations for chlorpyrifos. In this complicated environment, it will be important to monitor the registrants’ and industry’s response to DPR's cancellation actions, as well as their efforts on the pending Federal court litigation and EPA's registration review process for chlorpyrifos.
EPA Issues Guidance Regarding Prop 65 Labeling Requirements for Glyphosate Products and OEHHA Responds
On August 7, 2019, EPA took long awaited action concerning the inclusion of Prop 65 warning statements for glyphosate on EPA registered pesticide labels, which will likely impact the broader ongoing debate over EPA approval of Prop 65 warnings on pesticide labels. EPA’s August 7, 2019, letter to glyphosate registrants states that EPA “will no longer approve labeling that includes the Proposition 65 warning statement for glyphosate-containing products.” EPA stated further that “[t]he warning statement must also be removed from all product labels where the only basis for the warning is glyphosate and from any materials considered labeling under FIFRA for those products.” Moreover, EPA unequivocally states that “pesticide products bearing the Proposition 65 warning statement due to the presence of glyphosate are misbranded” under FIFRA Section 2(q)(1)(A). Registrants with glyphosate products currently bearing Prop 65 warning language, where the exclusive basis for such warning is based on the presence of glyphosate, must submit draft amended labeling that removes this language by November 5, 2019.
By way of background, California’s Office of Environmental Health Hazard Assessment (OEHHA) listed glyphosate as a chemical known to the state of California to cause cancer on July 7, 2017. OEHHA’s listing of glyphosate as a substance under Prop 65 is based on the International Agency on the Research for Cancer (IARC) classifying it as “probably carcinogenic to humans.” EPA scientists subsequently completed an independent review of the available scientific data on the potential carcinogenicity of glyphosate and do not agree with the IARC classification. Additional information regarding glyphosate is available at B&C’s blog.
Also of note is a February 26, 2018, preliminary injunction issued by the U.S. District Court for the Eastern District Court of California, in response to a motion filed by a coalition including Monsanto, CropLife America, and several growers associations alleging that the IARC classification decision for glyphosate is contrary to the international scientific consensus, that the required Prop 65 warning would be misleading to the ordinary consumer, that compelling the manufacturers of glyphosate to provide such a warning would violate the First Amendment because the warning is not factual and uncontroversial, and that the applicable criteria for injunctive relief were met. The February 26, injunction precluded OEHHA from enforcing its Prop 65 warning requirements against glyphosate registrants that otherwise would have taken effect on July 7, 2018. The Court did not rule that glyphosate should be removed from the Prop 65 list as a chemical known to the State of California to cause cancer, but did state that products containing glyphosate would not be required to comply with the warning requirements. In issuing the preliminary injunction, the Court stated that the required warnings are “false and misleading” and that plaintiffs “have shown that they are likely to succeed on the merits of their First Amendment claim, are likely to suffer irreparable harm absent an injunction, and that the balance of equities and public interest favor an injunction, the court will grant plaintiffs’ request to enjoin [Prop 65]’s warning requirement for glyphosate.” More information on that case is available at B&C’s blog. That injunction has not been appealed and remains in place.
Although the glyphosate warning that EPA has refused to allow is based on OEHHA’s recent listing under Prop 65, Prop 65 warnings on pesticide labels generally have been a significant issue since 2016 when OEHHA issued revised regulations regarding the content and transmission of Prop 65 warnings. As a result of these revisions, many registrants sought to add Prop 65 warning requirements to pesticide labels to meet Prop 65 requirements, but many registrants have not been able to obtain EPA approval for such warnings, resulting in much controversy and discussion. More information regarding the changes to Prop 65 warning requirements also are available at B&C’s blog.
In its press release announcing its guidance to glyphosate registrants, EPA Administrator Andrew Wheeler states: “It is irresponsible to require labels on products that are inaccurate when EPA knows the product does not pose a cancer risk. We will not allow California’s flawed program to dictate federal policy.” EPA states that its “independent evaluation of available scientific data included a more extensive and relevant dataset than IARC considered during its evaluation of glyphosate, from which the agency concluded that glyphosate is ‘not likely to be carcinogenic to humans.’” Wheeler is further quoted as stating: “It is critical that federal regulatory agencies like EPA relay to consumers accurate, scientific based information about risks that pesticides may pose to them. EPA’s notification to glyphosate registrants is an important step to ensuring the information shared with the public on a federal pesticide label is correct and not misleading.”
OEHHA immediately released its own press release on August 13, 2019, in which it “objects to US EPA’s characterization of any warning concerning glyphosate’s carcinogenicity as a false claim.’” After reiterating OEHHA’s listing glyphosate based on the IARC determination, OEHHA states that EPA’s position “conflicts with the determination made by IARC” and that “it is disrespectful of the scientific process for US EPA to categorically dismiss any warnings based on IARC’s determinations as false.”
The Court’s February 26, 2018, preliminary injunction was considered a significant development both for glyphosate specifically and perhaps for Prop 65 warning requirements generally, especially considering the recent influx to EPA of label amendments seeking EPA approval of revised Prop 65 warning language to address OEHHA’s revised regulatory changes. EPA’s guidance is equally significant, as EPA has now rejected the inclusion of a Prop 65 warning that EPA believes is misleading on a federal pesticide product label.
FIFRA Section 24(b) expressly prohibits any State from requiring any label language for a registered pesticide product beyond the labeling approved by EPA, and EPA has now declined to approve pesticide labeling that includes the Prop 65 warning for glyphosate. In some instances, EPA has been willing as a courtesy to approve labeling changes requested by a State, but the glyphosate determination demonstrates that EPA will not accept any label revisions that conflict materially with its own determinations. Although glyphosate is a fairly complex and controversial case, it will be important for registrants to monitor the evolution of EPA’s standard for when it will or will not approve a Prop 65 warning on a federal label, since this issue has been the subject of considerable controversy over the past several years.
Parties Who Requested that EPA Revoke All Tolerances and Cancel All Registrations for Chlorpyrifos, and Eight States, File New Petitions Challenging EPA’s 2019 Order Denying that Request, Seek Consolidation with the Existing Chlorpyrifos Case, and Oppose a Motion by EPA to Dismiss the Existing Case as Moot
On August 7, 2019, the League of United Latin American Citizens, Pesticide Action Network North America, Natural Resources Defense Council, and other petitioners (Petitioners) filed a new petition in the Ninth Circuit Court of Appeals seeking judicial review of United States Environmental Protection Agency (EPA) orders denying their request that EPA revoke all tolerances and cancel all registrations for chlorpyrifos. On August 8, 2019, New York, California, Hawaii, Maryland, Vermont, Washington, Massachusetts, and the District of Columbia (States) also filed a new petition for judicial review concerning the refusal of EPA to ban chlorpyrifos. The Petitioners and the States seek judicial review of the July 18, 2019, final order by EPA dismissing all objections to the initial decision by EPA to retain tolerances and registrations for chlorpyrifos, and of EPA’s March 29, 2017, order that initially denied a 2007 petition to revoke all tolerances and cancel all registrations for chlorpyrifos.
The Petitioners and the States also seek consolidation of their newly filed petitions for judicial review with currently pending chlorpyrifos litigation in LULAC, et al. v. Wheeler, et al. As part of rehearing in the LULAC case, the Ninth Circuit vacated a prior decision that ordered EPA to cancel chlorpyrifos registrations, and instead issued a writ of mandamus requiring EPA to respond to objections to the 2017 denial order within 90 days. EPA then issued the July 18, 2019, order denying all objections, along with a motion on July 19, 2019, to dismiss the LULAC case as moot. EPA seeks dismissal of LULAC because it contends that the 2017 initial order was never itself reviewable, and EPA has now done everything that the writ of mandamus required. The Petitioners oppose the motion to dismiss because it would require the Court to take a position on a jurisdictional issue which they contend was not decided during rehearing. The Petitioners and the States also argue that dismissal would be unnecessary and inefficient, requiring the challenging parties to reconstitute the record for review compiled in LULAC.
Petitioners also note that the Ninth Circuit retained jurisdiction when it issued mandamus in LULAC, and they request that their combined challenge to the EPA decision to retain the existing tolerances and registrations for chlorpyrifos be heard by the Court en banc as well.
The latest petitions for judicial review of EPA’s 2019 decision to retain all tolerances and registrations for chlorpyrifos pending registration review were anticipated by all parties, and all parties agree that the procedural requisites for a judicial determination concerning the legality of EPA’s final decision to deny the 2007 administrative petition have now been satisfied. The Petitioners and the States will likely argue that prior scientific determinations by EPA, including EPA analysis of epidemiology studies that purport to establish a link between exposure to chlorpyrifos and adverse neurodevelopmental effects in children, require that EPA proceed to revoke all tolerances and cancel all registrations for chlorpyrifos, while EPA will likely argue that difficult scientific issues concerning chlorpyrifos remain unresolved and should be addressed by EPA as part of the pending registration review for chlorpyrifos.
In addition to the dispute about combining the new petitions for review with the LULAC case, an interesting element of the latest filing by the Petitioners is that they attempt to bootstrap en banc review of the 2019 order in which EPA finally denied the administrative petition to revoke tolerances and cancel registrations for chlorpyrifos. En banc review for an initial hearing (as opposed to en banc rehearing in a previously decided case) is allowed by the applicable appellate rules, but such review is disfavored and would be highly unusual. Petitioners argue that it is warranted here because the en banc panel in the rehearing in the LULAC case reserved jurisdiction. Given the motion by EPA to dismiss the LULAC case as moot, it can be presumed that EPA is likely to oppose this vicarious argument for en banc judicial review. EPA can argue that the only reason the en banc panel retained jurisdiction was to assure that EPA would timely comply with the writ of mandamus that required EPA to rule on the objections within 90 days.
For further information on the long history of litigation concerning the petition to ban chlorpyrifos, please review our prior blog entries.