By Lisa M. Campbell, Lisa R. Burchi, and James V. Aidala
On February 1, 2018, the U.S. Environmental Protection Agency (EPA) announced it is publishing new guidance that sets forth a tiered approach intended to help manufacturers and EPA determine when the number of field trials necessary to register seed treatment uses can be reduced.
In its memo and attached Seed-Treatment Focus Group (STFG) Guidance Document dated January 26, 2018, EPA states that its Health Effect Divison (HED) has received “multiple waiver requests for seed-treatment field-trial residue data and has reviewed multiple field-trial datasets that indicated that there was the potential to reduce the number of field trials required to support the registration of seed-treatment uses.” EPA states that to evaluate this hypothesis, the HED Chemistry Science Advisory Council (ChemSAC), in collaboration with the Health Canada Pest Management Regulatory Agency (PMRA), in accordance with the July 11, 2017, Joint Canada/United States Field Trial Requirements “performed a retrospective analysis of all seed-treatment residue data that have been submitted to EPA/PMRA and has developed a tiered approach for determining if current crop-specific field trial data requirements are required to support new seed-treatment uses, or if a reduction in the number of required field trials is appropriate.” EPA’s announcement states that “the analysis showed that the data required to support registration could be substantially reduced and still be protective of human health.”
EPA developed two decision trees detailing the process for determining the residue chemistry field trial data requirements for seed-treatment uses: one for potato seed-piece (PSP) treatments only and another one for all remaining crops. EPA states that this case study demonstrates that application of the guidance set forth in these decision trees can, for both manufacturers and the agency, “potentially save considerable resources in terms of conducting, submitting, and reviewing the studies while still obtaining the data necessary to support seed-treatment pesticide registrations.”
The outlined procedure and memo document will supersede EPA’s previous guidance issued on October 28, 1999, entitled “Classification of Seed Treatments as Food or Nonfood Uses.”
More information is available on EPA’s Determining the Number of Field Trials Required to Register Seed-Treatment Uses webpage.
This announcement of improved review procedures allows EPA to cite both greater coordination across national borders (working with Canada), and reduce unnecessary data requirements. This would fit with the current Administration’s emphasis on reducing regulatory burdens and fostering greater innovation in regulated arenas. It also might be seen as general “good government,” as it updates guidance which is now almost twenty years old. Since seed treatment technology and associated policy issues have both evolved over the years, such a review and revision would seem timely regardless of any larger political directive.
By Lisa M. Campbell, Heather F. Collins, M.S., and Margaret R. Graham
On October 5, 2017, the U.S. Environmental Protection Agency (EPA) issued a notice of extension of the comment period for the draft guidance Pesticide Registration Notice (PR Notice) 2017-XX: Notifications, Non-notifications and Minor Formulation Amendment issued on September 6, 2017. Comments now must be received by EPA on or before December 5, 2017. The notice states that it will “allow stakeholders additional time to submit comments on the proposed guidance.” Eleven comments were filed in the docket, most of which expressed significant concern with changes EPA is proposing, in addition to requesting an extension to the previous deadline which was set to end on October 6, 2017.
EPA states that PR Notice 2017-XX will update and clarify “the scope of changes accepted by notification, non-notification and minor formulation amendments for all pesticide products, and supersedes both PR Notices 95-2 and 98-10 in their entirety.” A full summary of the changes in the draft guidance is available in our blog item "EPA Releases Draft Guidance for Pesticide Registrants on Notifications, Non-notifications, and Minor Formulation Amendments."
Some of the more substantive comments noted the following issues:
- Several commenters stated objections to the provisions in the draft PR Notice that would eliminate the ability of registrants of formulated products to use notification to add or change sources of either registered technical active ingredients or inert ingredients. Concerns expressed with this proposed change included the effect it would have on the ability of registrants to respond quickly to market changes and conditions, including the availability and price of technical and inert ingredients needed for formulations.
- One commenter had concerns with regard to the proposed changes to the inert ingredient disclosure statement, as EPA is “considering whether the notification method or the non-notification method is an appropriate avenue for industry requested inert disclosure based upon third-party vendor requirements.” The commenter stated that it “believes there is an approach that satisfies third-party vendors while minimizing the burden on the Agency’s resources,” and “a significant delay to this issue could have third-party vendor impacts.”
- Commenters also expressed disappointment with EPA’s notification delivery, stating that EPA “provided very little notice to Stakeholders of this major change in its policies regarding notification” and “as a result, many potentially affected registrants may overlook this change and fail to file comments on it.”
More information on this draft notice and other pesticide registration notice issues is available on our blog under key phrase Pesticide Registration Notice.
By Lisa M. Campbell, Sheryl L. Dolan, and Barbara A. Christianson
On September 6, 2017, the U.S. Environmental Protection Agency (EPA) published a notice in the Federal Register announcing the availability of and seeking public comment on draft guidance, Pesticide Registration Notice (PR Notice) 2017-XX: Notifications, Non-notifications and Minor Formulation Amendments. EPA states it is issuing this notice to “align the notification program with the requirements of the Food Quality Protection Act (FQPA) and [the Pesticide Registration Improvement Act (PRIA)] and to clarify the processes for accepting minor, low risk registration amendments to be accomplished through notification, non-notification or as accelerated amendments.” EPA is requesting comments, and specifically information on projected cost implications of this draft updated guidance.
PR Notices are issued by the Office of Pesticide Programs (OPP). EPA states that PR Notice 2017-XX will update and clarify “the scope of changes accepted by notification, non-notification and minor formulation amendments for all pesticide products, and supersedes both PR Notices 95-2 and 98-10 in their entirety.” The PR Notice lists the changes from PRN 98-10 in a table. Those changes include:
In addition to the changes listed on the table, modifications to PR Notice 98-10 consist of the following:
- F. Product Composition: (1) Pesticide Category -- Under PR Notice 98-10, the pesticide categories "disinfectant" and "sanitizer" were two pesticide categories that were allowed to be added to a label by notification. Under the proposed PR Notice, "disinfectant" and "sanitizer" were removed.
- F. Product Composition: (2) Odor -- Under PR Notice 98-10, the terms "fragrance free" and "unscented" were allowed to be added to a label by a notification provided that the product is odorless or nearly odorless and contains odor-masking ingredient such as a perfume. Under the proposed PR Notice, these terms were removed.
Minor Formulation Amendments
- A. Minor Formulation Amendments: (1) Addition, deletion or substitution of one or more colorants in a formulation -- Under PR Notice 98-10, if a product was intended for a use as a seed treatment or rodenticide, it would not be eligible for an accelerated review; that restriction was deleted from the proposed PR Notice.
- A. Minor Formulation Amendments: (2) Addition, deletion or substitution of one or more inert ingredients (other than colorants and fragrances) in a formulation -- Under the proposed PR Notice, if a product is a dog/cat pet spot-on product or if an inert is a bittering agent or a safener, the product would not be eligible for an accelerated review.
- A. Minor Formulation Amendments: (3) Addition, deletion or substitution of one or more fragrances in a formulation -- Under the proposed PR Notice, fragrances will be eligible for an accelerated review if all fragrance component ingredients are included on the Fragrance Ingredient List; individual fragrance component ingredients that exceed 0.1 percent (by weight) of the total pesticide product composition have existing approval for non-food use as an inert ingredient; and new/modified fragrances for antimicrobial products making public health claims are within the certified limits established for fragrances already approved for the product.
- Under the proposed PR Notice, products that are not eligible for accelerated review under minor formulation amendments are:
- Pet spot-on products;
- Change to an active ingredient source;
- Change to nominal concentration of the active ingredient; or
- Addition of new or additional Confidential Statements of Formula (CSF).
EPA Procedures to Review Notifications
Under the proposed PR Notice, EPA outlines changes to the policy for processing notifications by the Registration Division (RD) and the Biopesticides and Pollution Prevention Division (BPPD), but procedures to process notifications by the Antimicrobials Division remain the same.
One item to note under the proposed notification process for RD and BPPD is that a registrant may distribute or sell a product modified by notification once EPA receives the notification but, if EPA determines that a product has been modified through notification inappropriately, EPA may initiate regulatory and/or enforcement action without first providing the registrant with an opportunity to submit an application to amend the registration.
Registrants Submitting Minor Formulation Amendments
Under the proposed PR Notice, EPA requires that registrants submit with their application for registration a cover letter listing names and dates of all EPA accepted CSFs. EPA will consider any CSFs not listed in the cover letter as superseded/no longer valid.
Comments on this PR notice are due October 6, 2017, and can be submitted online under Docket ID EPA-HQ-OPP-2016-0671.
Registrants should review the draft PR Notice carefully, as it includes important changes. For example, the consequence for submitting a minor formulation amendment and neglecting to include a list of all current CSFs is severe. As another example, EPA signals in its proposal that proceeding to market with a product revised through the notification process may be risky if the submitter has erred in its judgment regarding what is eligible for a notification. Should the PR Notice be issued without change to this provision, submitters may wish to give close consideration to waiting until it has EPA’s written confirmation that a notification has been accepted before introducing the revised product to market. Comments on issues of concern should be considered.
By Sheryl L. Dolan and Margaret R. Graham
On August 1, 2017, the U.S. Environmental Protection Agency (EPA) announced the availability of two final test method Standard Operating Procedures (SOP) for evaluating the efficacy of antimicrobial pesticides against two biofilm bacteria, Pseudomonas aeruginosa (P. aeruginosa) and Staphylococcus aureus (S. aureus):
EPA also released regulatory guidance for test criteria and pesticide claims for these products, specifically Guidance for Testing the Efficacy of Antimicrobial Products Against Biofilms on Hard, Non-Porous Surfaces. Drafts of the SOPs and the guidance were initially released in October 2016 for comment. EPA received comments from nine entities and revised the drafts to incorporate suggested changes. EPA posted its response to those comments in Docket EPA-HQ-OPP-2016-0357.
EPA states that the two methods are adapted from ASTM International (ASTM) standard methods. EPA MLB SOP MB-19 is used to generate the P. aeruginosa or S. aureus biofilm on coupons. EPA MLB SOP MB-20, the Single Tube Method, then is used to determine the effectiveness of an antimicrobial product in reducing bacteria in biofilm on the coupons.
Notable aspects of the test criteria and claims guidelines include:
- The mean log density for the test organisms of 8.0 to 9.5 for P. aeruginosa and 7.5 to 9.0 for S. aureus; and
- Product performance criterion of a minimum 6-log reduction.
The guidance lists several examples of claims for efficacy against public health biofilm that EPA states are acceptable.
EPA MLB SOP MB-20 is designed to evaluate the efficacy of antimicrobial products that are water soluble powders or liquid formulations. If a company wishes to test a different type of product formulation, or test different target microorganisms, or make any other proposed modifications, it would be well advised to submit proposed alternatives to EPA for review and approval. EPA specifically cautions that the current methodologies are intended for data development to support claims for products registered for use on hard, non-porous surfaces and are not suitable for use sites associated with water systems.
The EPA’s Office of Pesticide Programs’ (OPP) regulation of biofilms has been the subject of increasingly intense commercial interest for years and the availability of this testing guidance is welcome news. While not all will agree with the approach, the new guidance is a helpful addition to OPP’s testing guidance portfolio.
More information on antimicrobial pesticides is available on our blog under key phrase Antimicrobial Pesticide. More information on the methods and guidance is available on EPA’s website and in Docket No. EPA-HQ-OPP-2016-0357.
By Lynn L. Bergeson and Margaret R. Graham
In June 2017, the U.S. Environmental Protection Agency (EPA) issued a draft Office of Chemical Safety and Pollution Prevention (OCSPP) National Program Manager Guidance for Fiscal Year (FY) 2018-2019, which sets forth the strategies and actions that EPA and its state and tribal partners will undertake to protect human health and the environment via six key programmatic activities. EPA uses an Annual Commitment System (ACS) to track annual regional performance information and results. Below is a listing of the six programmatic activities and their ACS measures, if applicable:
- Strengthening state and tribal partnerships through continued effective management of pesticide cooperative agreements. The guidance states that the “National Pesticide Program depends on cooperative agreements with states and tribes to implement many of the requirements of the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) and to help ensure [EPA’s] regulatory decisions and programs achieve intended protections. For the ACS measure, the commitment target is 100 percent of pesticide program required activities included in grantee work plans completed under pesticide program portion of the FIFRA Grant Guidance. More information on the activities is listed in the guidance.
- Assisting in national, regional, and local pollinator protection efforts. EPA states that “through risk assessment, mitigation, education, and outreach, EPA’s Office of Pesticides Programs’ goal for pollinator protection is to ensure all pollinators, including managed pollinators such as honey bees, and native pollinator including Monarch Butterflies, are protected from adverse effects of pesticide exposure.” More information on the activities is listed in the guidance. EPA is not proposing any ACS measures to be associated with this area of focus for FY2018-2019.
- Effectively implementing the revised pesticides worker protection standard rule. More information on this rule is available on our blog under key phrase Worker Protection Standard. EPA states that no ACS measure is proposed to be associated with this area of focus for FY2018-2019 to “allow regional offices the flexibility to direct their efforts where they are most needed, and to select the activities and level of effort appropriate for the needs of their region.”
- Effectively implementing the revised certification of pesticide applicators rule. Same as above, EPA states that no ACS measure is proposed to be associated with this area of focus for FY2018-2019 to “allow regional offices the flexibility to direct their efforts where they are most needed, and to select the activities and level of effort appropriate for the needs of their region.” More information on this rule is available on our blog under key phrase pesticide applicators.
- Focusing region-specific pesticide priorities on those areas of greatest need nationally. EPA states that region-specific pesticide priority areas “support the agency’s national pesticide program efforts. In addition, these projects support one or more of the agency’s Strategic Plan goals and strategies, and directly benefit states and/or tribes. The region-specific pesticide priority areas to choose from are: (1) promotion of state and tribal pesticide program coordination and communication; (2) bed bug outreach and assistance; (3) promotion, development or support of integrated pest management efforts; (4) support of water quality risk assessment and mitigation; (5) spray drift outreach and incident data collection; and (6) support of emerging public health pesticide issues. The ACS measure commitment target is one project or initiative contributing to the implementation and enhancement of the region-specific pesticide program priority areas.
- Toxics Release Inventory (TRI). For the TRI program, EPA includes three ACS measures on the number of TRI data quality checks:
- The TRI-1 measure allows EPA to track performance of the TRI program, and aid in improving the accuracy and reliability of environmental data. This measure will provide valuable information as more than 21,000 facilities report to the TRI program annually.
- For FY2018, TRI-1 is a non-commitment measure of data quality calls and emails to 600 facilities in total across all regional offices.
- For FY2019, TRI-1 will be a commitment measure of data quality calls and email to 600 facilities in total across all regional offices.
By Lynn L. Bergeson and Margaret R. Graham
In a May 11, 2017, letter from U.S. Environmental Protection Agency (EPA) Acting Assistant Administrator Wendy Cleland-Hamnett to the CEO of the National Association of State Departments of Agriculture (NASDA) posted by Bloomberg’s BNA Daily Environment Report, Cleland-Hamnett states that it is appropriate to grant NASDA’s request to delay implementation of all revised provisions to the agricultural Worker Protection Standard (WPS) “until the necessary guidance and training have been completed which would allow state lead pesticide agencies to successfully implement the rule changes.” EPA has not yet issued any formal delay notifications.
The May 11, 2017, letter was sent in response to a February 17, 2017, letter from NASDA (February 21, 2017, per the NASDA website) that requested EPA to extend the WPS “until at least January 2, 2018, or until adequate enforcement guidance, educational materials, and training resources have been completed and the state lead agencies have the tools, time, and resources necessary to effectively implement the rule changes and assist the regulated community with compliance activities.” This letter was not submitted in the WPS docket in response to a request for comment, but pursuant to a NASDA membership decision. NASDA states in the letter that the new WPS regulations require “significant additional staff time to provide sufficient outreach to workers, handlers, applicators, agricultural employers, trainers and other stakeholders,” and that “the enhanced compliance and record keeping requirements require a robust delivery and understanding of educational resources and training materials to assist [state lead agencies] and the regulated community in understanding, complying, and enforcing the new requirements.”
The WPS final rule including updates and revisions to the existing worker protection regulations for pesticides under the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) became effective on January 1, 2016, and on January 4, 2017, agricultural employers and handler employers were required to comply with all of the new requirements set forth in the final rule – with the exception of two requirements that would be implemented not before January 2018. More information on the final rule is available in our blog item EPA Publishes Worker Protection Standard Final Rule.
By Margaret R. Graham
On November 29, 2016, the U.S. Environmental Protection Agency (EPA) announced the issuance of its new guidance for testing pesticides designed to reduce animal testing for acute dermal toxicity for pesticides, Guidance for Waiving Acute Dermal Toxicity Tests for Pesticide Formulations & Supporting Retrospective Analysis, in final. This guidance was issued as part of the Office of Pesticide Programs’ (OPP) Strategic Vision for implementing the 2007 National Research Council’s report on Toxicity Testing in the 21st Century.
OPP states that it “receives about 200-300 dermal formulation toxicity tests annually, each of which generally use 10 animals per test,” and “[w]e expect this waiver guidance to save 2,500 or more laboratory animals every year.” Further, as described in OPP Director Jack Housenger’s March 17, 2016, letter to stakeholders, “[t]his new policy represents significant progress toward EPA’s goal of significantly reducing the use of animals in acute effects testing.”
More information on OPP’s Strategic Direction for Adopting 21st Century Science Methodologies is available on EPA’s website and in our blog item EPA’s OPP Releases Guidance Documents Related to Strategic Vision for Adopting 21st Century Science Methodologies.
By Lisa M. Campbell, Lisa R. Burchi, and Margaret R. Graham
The U.S. Environmental Protection Agency (EPA) has recently announced the availability of two proposed test methods and associated testing guidance for evaluating antimicrobial pesticides against two biofilm bacteria, Pseudomonas aeruginosa and Staphylococcus aureus, for comments. EPA states that registrants of antimicrobial products with public health claims are “required to submit efficacy data to EPA in support of the product’s registration” under the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA). EPA is soliciting comments on the clarity of the standard operating procedures and the regulatory guidance. The two test methods are:
The Draft Guidance to Assess the Efficacy of Antimicrobial Pesticide Products Intended to Control Public Health Biofilms on Hard, Non-Porous Surfaces describes biofilms and their public health significance; the two test procedures for developing efficacy data supporting biofilm claims; products that may be eligible for biofilm claims; test criteria; data submission procedures for efficacy data; and labeling guidance.
The draft guidance states that the term biofilm “is reserved for claims against biofilm that contain specific bacteria that are directly or indirectly infectious or pathogenic to humans,” and “biofilm claims are considered to be public health claims for which the agency must review and approve appropriate efficacy data.” EPA states: “Examples of use sites that may be supported by the biofilm test methodologies herein, and found acceptable, include restrooms, shower stalls, sink basins or drains (excluding the drain pipe) and nearby hard, non-porous surfaces of walls, countertops, and instrument trays in patient care areas of hospitals. In contrast, claims against non-public health slimicides must also be supported by appropriate efficacy data, however, submission of the data is only required when requested by the EPA.”
The Draft Guidance also sets forth examples of acceptable label claims against public health biofilms and acceptable non-public health claims. The examples of acceptable label claims against public health biofilms are:
- Kills 99.9999% of bacteria* in biofilm on a hard, non-porous surface;
- Kills a minimum of 99.9999% of bacteria* in biofilm;
- Reduces at least 99.9999% of bacteria* growing in biofilm;
- Formulated to kill 99.9999% of bacteria* in biofilm;
- Other related claims:
- Kills biofilm bacteria*; and
- Penetrates biofilm, killing the bacteria* living there.
*[List of bacteria “tested as a biofilm”; at a minimum, Pseudomonas aeruginosa and Staphylococcus aureus].
Examples of acceptable non-public health claims supported by appropriate efficacy data include:
- Cleans away microorganism slime/grunge;
- Maintains control of slime; and
- Controls slime-forming microorganisms.
Comments will be accepted until December 5, 2016.
By Lisa M. Campbell, James V. Aidala, and Lisa R. Burchi
On June 7, 2016, the U.S. Environmental Protection Agency (EPA) announced that it was making two draft Pesticide Registration Notices (PR Notices) available for public comment: (1) PR Notice 2016-X: Draft Guidance for Pesticide Registrants on Pesticide Resistance Management Labeling; and (2) PR Notice 2016-XX: Draft Guidance for Herbicide Resistance Management Labeling, Education, Training, and Stewardship. In its news release, EPA states that it has started a “more widespread effort aimed at combating and slowing the development of pesticide resistance,” in an effort to “address the growing issue of resistance and preserve the useful life of pesticides.”
Draft PR Notice 2016-X
Draft PR Notice 2016-X, which revises and updates PR Notice 2001-5, applies to all conventional agricultural pesticides (i.e., herbicides, fungicides, bactericides, insecticides and acaricides). The focus of the updates in PR Notice 2016-X is on pesticide labels and improving information about how pesticide users can minimize and manage pest resistance.
Specifically, EPA is proposing that specific resistance-management statements be included with the Directions for Use section under the heading “Resistance Management Recommendations.” EPA states that the proposed labeling statements “focus on the mitigation of pest resistance and should be used where applicable based on the availability of other pesticides and production practices specific to that crop.” As one example, EPA recommends the following general resistance management labeling statements for insecticide/acaricide products containing only a single active ingredient or multiple active ingredients that are from the same Mode of Action (MOA) group:
- For resistance management, (name of product) contains a Group (mode of action group number) insecticide (or acaricide). Any (insect/mite) population may contain individuals naturally resistant to (name of product) and other Group (mode of action group number) insecticides/acaricides. The resistant individuals may dominate the insect/mite population if this group of insecticides/acaricides are used repeatedly in the same fields.
Since the recommended resistance-management statements depend on an active ingredient’s MOA, PR Notice 2016-X also addresses MOA grouping and identification symbols for agricultural uses of herbicides, fungicides/bactericides, and insecticides/acaricides. The pesticide groupings are provided by the Weed Science Society of America (WSSA), the Herbicide Resistance Action Committee (HRAC), the Fungicide Resistance Action Committee (FRAC) and the Insecticide Resistance Action Committee (IRAC). The MOA groups, and the identifier numbers and/or letters (i.e., symbols or codes) for herbicides, fungicides/bactericides and insecticides/acaricides may be accessed through the websites of the different Resistance Action Committees. For example, for insecticides, IRAC uses a combination of numbers and letters to identify various MOA groups. EPA recommends that the IRAC MOA identifier codes be used for designating insecticide MOA grouping information on labels for pesticides containing insecticides. The IRAC MOA list and identifier codes can be found online.
While current PR Notice 2001-5 contains similar guidance in terms of MOA groupings and general pesticide-resistance statements, the Draft PR Notice 2016-X provides: (1) additional guidance, and recommended format, for resistance management statements or information to place on labels; (2) includes references to external technical resources for guidance on resistance management (e.g., professional scientific societies, resistance action committees for different types of pesticides); and (3) updates the instructions on how to submit changes to existing labels to enhance resistance management language. In addition, while PR Notice 2001-5 states that “implementation of this program is purely voluntary by the pesticide industry,” the language in Draft PR Notice 2016-X is arguably stronger, with EPA “encouraging” registrants to add the appropriate resistance-management statements through notification, amendment, or as part of an application for a new product.
Draft PR Notice 2016-XX
Draft PR Notice 2016-XX, which only applies to herbicides, is intended to provide guidance on labeling, education, training, and stewardship for herbicides undergoing registration review or registration (i.e., new herbicide actives, new uses proposed for use on herbicide-resistant crops, or other case-specific registration actions). EPA states it is focusing on the holistic guidance for herbicides first because:
- Herbicides are the most widely used agricultural chemicals;
- No new herbicide mechanism of action has been developed in the last 30 years; and
- Herbicide-resistant weeds are rapidly increasing. In the future, the Agency plans to evaluate other types of pesticides (e.g., fungicides, bactericides, insecticides, and acaricides) to determine whether and what guidance may be appropriate for these types of pesticides.
Under guidance described in PR Notice 2016-XX, EPA proposes to divide 28 herbicide Mechanisms of Actions into three categories of concern (low, moderate, high) based on the risk of developing herbicide-resistant weeds. Appendix I to PR Notice 2016-XX provides three tables with herbicide Mechanisms of Actions of “Low Concern,” “Moderate Concern,” and “High Concern” for herbicide resistance. EPA states its intent to make these tables available on its website, noting that the tables would need to be “checked periodically to determine if there are changes to the groupings or level of concern categories.” Appendix II to PR Notice 2016-XX sets forth the following eleven elements that are focused on labeling, education, training, and stewardship strategies:
- Element 1. List Mechanism of Action Group Number on label.
- Element 2. List seasonal and annual maximum number of applications and amounts.
- Element 3. Provide Resistance Management language from PR Notice 2016-X, and/or Best Management Practices language from WSSA and HRAC, and/or HRAC proposed guidelines for herbicide labels. Note that Best Management Practices (BMP) should be appropriate to crop and production system.
- Element 4. Instruction to user to scout before and after application.
- Element 5. Provide definition of Likely Resistance.
- Element 6. Instruction to user to report lack of performance to registrant or their representative.
- Element 7. List confirmed resistant weeds in a separate table and list recommended rates for these weeds with the table.
- Element 8. Registrant report new cases of likely and confirmed resistance to EPA and users yearly. This is in addition to any adverse effects reporting.
- Element 9. Provide growers with:
- Resistance Management Plan;
- Remedial Action Plan (to control resistant weeds this season or next season);
- Educational materials on resistance management; and
- Plans should be locally developed and easily modified. EPA recommends that registrants work with Extension, Consultants, Crop Groups, HRAC, and the U.S. Department of Agricultute (USDA).
- Element 10. For combination products with multiple Mechanisms of Action, list which herbicide is controlling which weed (a three-way mixture may only have one effective Mechanism of Action for some problem weeds). List minimum recommended rate if resistance is suspected.
- Element 11. Any additional specific requirements (e.g., mandatory crop rotation, unique agronomic aspects, additional training, time limited registration, etc.).
Elements 1 through 4 are proposed for Mechanisms of Actions of Low Concern, elements 1 through 8 are proposed for Mechanisms of Actions of Moderate Concern, and elements 1 through 11 are proposed for Mechanisms of Actions of High Concern.
The PR Notices are available on www.regulations.gov under Docket Numbers EPA-HQ-OPP-2016-0242 for PR Notice 2016-X; and EPA-HQ-OPP-2016-0226 for PR Notice 2016-XX. Comments are due by August 2, 2016.
With regard to PR Notice 2016-XX, EPA states that while comments are welcome on all aspects of this Notice, EPA is especially interested in comments on the following: (1) the approach, elements and categorization used to address herbicide resistance; (2) limiting the application of these measures during registration review to new herbicide active ingredients, new uses of herbicides proposed for use on herbicide-resistant crops, and other case-specific registration actions; (3) other effective measures to inform the stakeholder community of the occurrence of likely resistance; and (4) other useful strategies that, when implemented, would slow the development of herbicide resistance and prolong the useful life of herbicides.
More information on pesticide resistance management is available on EPA’s website.
Avoiding the onset of resistance to any pesticide product is a widely shared goal of users and registrants of the pesticide to maintain the effectiveness and profitability of the product. There is controversy, however, when EPA suggests specific instructions to the user community, since pesticide applications are site and situation specific, making general “one size fits all” approaches, even “flexible” ones, suspect among much of the user community. When the instructions involve label requirements, which are enforceable, concerns about flexibility and the need to adapt to local conditions increase.
Resistance management has been a stated goal of EPA for some time; here EPA seems to argue it is of the utmost importance to preserve useful pest control tools since it is better to have more “tools in the toolbox.” Yet, when EPA seeks to restrict a product or class of products and users and registrants cite the need for that product for resistance management, few benefits seem to be associated with resistance management in such cases. Overall, there is also suspicion that EPA’s concerns regarding herbicide resistance masks a political response to critics of the widespread adoption of herbicide-resistant genetically engineered crops -- since the high value of resistance management gains little value when EPA attempts to restrict other products. An example is EPA’s approach to organophosphate insecticides, where EPA is currently seeking to eliminate many uses that otherwise are viewed as important for insecticide resistance management.
Having EPA attempt to address resistance management via label instructions will be controversial, notwithstanding broad consensus that avoiding resistance is a shared goal. So, the likely debate will focus less on the goal, and more on the means of achieving the goal, as this issue moves forward.
By Susan Hunter Youngren, Ph.D., James V. Aidala and Lisa M. Campbell
The Environment Protection Agency (EPA) extended the comment date on its draft guidance, Pesticide Cumulative Risk Assessment: Framework for Screening Analysis, in a Federal Register notice published on August 28, 2015. EPA’s draft framework provides guidance on how the EPA will screen groups of pesticides for cumulative evaluation. EPA proposes using a two-step approach, beginning with the evaluation of available toxicological information and, if necessary, followed by a risk-based screening approach. This framework supplements the existing guidance documents for establishing common mechanism groups (CMG) and conducting cumulative risk assessments (CRA). Additionally, EPA is also seeking comments on a draft copy of the human health risk assessment where the cumulative assessment was conducted in conjunction with pending actions for abamectin.
EPA has described a process that is data intensive and that requires sophisticated knowledge and modeling. EPA acknowledges that “the level of refinement provided by this approach is not necessary or even feasible for all existing pesticide classes.” The policy documents for conducting the first step in the process, “developing CMGs,” are still being refined.
This document provides the guidance for screening information to identify candidate CMGs and does not outline how actually to conduct CRAs. Rather, this document relies on policies and principles provided in other documents found on the EPA cumulative risk assessment website. These additional policies and principles were developed during the conduct of five CRAs for chemical groups such as the organophosphates and carbamates.
One of the major questions raised by the issuance of this document is the extent of the information that EPA will require for each chemical to determine if there are CMGs. The five CMGs currently assessed have relatively well defined mechanisms of action. It is not clear, however, what EPA will consider to be adequate justification that there are no other chemicals with the same mechanism of action for other chemicals of concern.
Requirements for EPA to determine and assess the risks of possible common mechanism of action among groups of similar pesticides was one of the most far-reaching new requirements imposed by the Food Quality Protection Act. Some observers expected a larger impact on pesticide use than what has occurred to date; whether EPA’s new approach results in more groupings or otherwise leads to restrictions on more groups of pesticides remains to be seen.
Comments on the draft guidance are due September 28, 2015. More information regarding EPA’s assessment of pesticide cumulative risk is available online.