Bergeson & Campbell, P.C. serves small, medium, and large pesticide product registrants and other stakeholders in the agricultural and biocidal sectors, in virtually every aspect of pesticide law, policy, science, and regulation.

By Lisa M. Campbell, Timothy D. Backstrom, and James V. Aidala

On June 3, 2020, the U.S. Court of Appeals for the Ninth Circuit (Ninth Circuit) issued an opinion in National Family Farm Coalition v. EPA, No. 19-70115, vacating the U.S. Environmental Protection Agency’s (EPA) 2018 decisions to extend the conditional registrations for  three reduced volatility dicamba herbicides, Bayer’s XtendiMax, Corteva’s FeXapan, and BASF’s Engenia. 

The manufacturers of these dicamba products designed them to facilitate control of glyphosate resistant weeds in strains of soybeans and cotton that have been genetically modified to be dicamba tolerant (DT).  Although the manufacturers intended these dicamba products to be less volatile and less susceptible to drift into adjacent non-target areas than previous formulations of dicamba, there were nonetheless many complaints that the products cause damage to non-tolerant crops and other vulnerable vegetation.  The Petitioners that challenged EPA’s decision to extend the conditional registrations for these reformulated dicamba products include a group representing small farmers who claim that the new dicamba products have damaged their crops (National Family Farm Coalition) and several non-governmental organizations that routinely oppose new pesticide registrations (the Center for Food Safety, the Center for Biological Diversity, and Pesticide Action Network North America). 

Although the case included some allegations by the Petitioners that EPA did not comply with the requirements of the Endangered Species Act, the court did not reach those issues.  The court found unanimously that EPA’s decision to extend the conditional registrations for the three dicamba herbicides did not satisfy the requirements of the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA).  Specifically, the court found that the administrative record compiled by EPA did not include “substantial evidence” supporting EPA’s determination that registering the new uses “would not significantly increase the risk of any unreasonable adverse effects on the environment.”  EPA is required under FIFRA Section 3(c)(7)(B) to make this determination to grant a conditional registration of new uses of a currently registered pesticide.  The court concluded that EPA could not make this required determination because, the court stated, the record shows that EPA “substantially understated the risks that it acknowledged” and also “entirely failed to acknowledge other risks.”

According to the court, EPA made six material errors in its analysis supporting the registrations. First, the court stated that EPA understated the amount of acreage planted with DT crops in 2018, and consequently also underestimated the amount of the new dicamba products that would be applied that year, even though the decision to extend the conditional registrations for the new dicamba products was not issued until the end of the 2018 growing season.  Second, in the court’s view, EPA improperly found that the number of complaints concerning damage to non-target crops and vegetation by the new dicamba products might be over-reported when the record included overwhelming evidence that non-target damage was being under-reported.  Third, the court stated that EPA refused even to estimate how much damage to non-target vegetation would be caused by the new dicamba products when the record contained sufficient information for EPA to make such an estimate.  Fourth, according to the court, EPA refused to acknowledge the substantial risk of non-compliance with the large number of detailed restrictions set forth in the 40-page approved label, although the court found that “there was substantial evidence that even conscientious applicators had not been able to consistently adhere to the label requirements.”  Fifth, the court believes EPA failed to acknowledge the anti-competitive effect of the new technology, which encourages other growers to use DT crops even if they do not use the new dicamba products, to avoid damage from nearby applications.  Sixth, according to the court, EPA failed to acknowledge the social cost being caused in small communities where damage caused by use of the new dicamba products has turned formerly amicable neighbors against each other. 

Based on all of these purported deficiencies, the court held that EPA’s rationale for determining that the risk of unreasonable adverse effects would not be significantly increased by the new dicamba uses, and that the registration for the new dicamba products could therefore be extended for two additional years, was not supported by “substantial evidence” in the administrative record taken as a whole.  The court also held that remanding the matter to EPA for further action without vacatur would not be appropriate because EPA did not satisfy the requirement to extend the conditional registrations.  Instead, the court simply vacated the registrations and invited EPA to try again.  The court acknowledged that such a decision would cause disruption, especially for those growers that have already purchased DT seeds and dicamba herbicides for this year's growing season, but concluded that no remedy other than vacatur would be appropriate given the deficiencies in the administrative record.

Commentary

When FIFRA was amended to allow new pesticide products to be “conditionally” registered even though the applicants had not submitted data to satisfy all applicable requirements, the focus was primarily on allowing registration of new products that are “substantially similar” to already registered products.  FIFRA Section 3(c)(7) also allows conditional registrations to be issued for new uses of existing active ingredients and for new active ingredients without all required data if EPA has sufficient information to make certain findings while it waits for additional data, but requires that EPA be able to determine that certain requirements can be met even though not all of the supporting data that will ultimately be needed are yet available.

This court’s decision illustrates the type of problems that can occur when EPA issues a conditional registration for new products that are not “substantially similar” to registered products.  The court’s view of the sufficiency of the record in this case sets a high bar for the determinations that must support other types of conditional registrations.  This problem was previously illustrated when a reviewing court vacated a new registration for a new nanosilver product even though there were already registered nanosilver products.  In that case, because EPA chose as a matter of policy to characterize the product as a new active ingredient, it was required to make a “public interest” determination under FIFRA Section 3(c)(7)(C).  When the administrative record was deemed insufficient to support this mandatory determination, the reviewing court vacated the registration. 

In the case of the new dicamba products, to grant conditional registrations for new uses of an existing active ingredient, EPA was required to determine that the new uses on DT soybeans and cotton would not “significantly increase the risk of unreasonable adverse effects on the environment” under FIFRA Section 3(c)(7)(B).  The court found the record supporting this mandatory determination to be insufficient, resulting in the court’s vacatur of EPA’s decision.  These two reviewing courts have taken a relatively deep dive into the administrative record supporting a conditional registration for a new use of an existing active ingredient or a new active ingredient in evaluating whether substantial evidence in the record supports the determinations required by FIFRA.  Whether future decisions will maintain such a stringent evidentiary standard will be important to monitor.


 

By Lisa M. Campbell, James V. Aidala, and Timothy D. Backstrom

On October 31, 2018, the U.S. Environmental Protection Agency (EPA) announced that it is extending the registration of dicamba for two years for “over-the-top” use (application to growing plants) to control weeds in fields for cotton and soybean plants genetically engineered to resist dicamba.  EPA states that the registration for these dicamba products will expire on December 20, 2020, unless EPA decides to further extend it.  EPA states that the label changes described below were made to ensure that these products can continue to be used effectively while addressing potential concerns to surrounding crops and plants.  EPA’s dicamba registration decisions for the 2019-2020 growing season are:

  • Two-year registration (until December 20, 2020);
  • Only certified applicators may apply dicamba over-the-top (those working under the supervision of a certified applicator may no longer make applications);
  • Prohibit over-the-top application of dicamba on soybeans 45 days after planting and cotton 60 days after planting;
  • For cotton, limit the number of over-the-top applications from four to two (soybeans remain at two over-the-top applications);
  • Applications will be allowed only from one hour after sunrise to two hours before sunset;
  • The downwind buffer for all applications will remain at 110 feet, but in those counties where endangered species may exist, there will also be a new 57-foot buffer around the other sides of the field;
  • Clarify training period for 2019 and beyond, ensuring consistency across all three products;
  • Enhanced tank clean out instructions for the entire system;
  • Enhanced label to improve applicator awareness on the impact of low pH’s on the potential volatility of dicamba; and
  • Label clean up and consistency to improve compliance and enforceability.

EPA states that it has reviewed substantial amounts of new information and has determined that the continued registration of these dicamba products with the specified use restrictions meets the Federal Insecticide, Fungicide, and Rodenticide Act’s (FIFRA) registration standards.  EPA also determined that extending these registrations with the new safety measures will not affect endangered species.  More information on this extension is available on EPA’s website; more information on other dicamba issues is available on our blog.

Commentary

As expected, this decision allows the continued use of the newer dicamba formulations intended to be applied on dicamba-resistant crop varieties.  Of particular note is that EPA has not granted a permanent Section 3 registration, instead granting a time-limited, two-year registration which EPA states will expire at the end of 2020.  This will allow EPA more time to assess in more detail whether the new use restrictions will further reduce problems of misuse, label complexity, or unexpected drift which have been reported in past growing seasons. 

The most vexing issue behind plant injury reports over the past few years is whether these reports are mostly due to misuse (e.g., applicators who do not use the new formulations designed to reduce volatility, which is a label violation since the “old dicamba” product is considered more prone to cause drift injury), or, are due to characteristics of the new formulations which are not yet fully understood and which lead to unexpected volatility and other drift problems.  Some have also argued that problems are also due to the difficulty (or reluctance) in following the more prescriptive requirements for the new formulations.  The two-year renewal will continue to see EPA closely monitor injury and misuse reports, as well as continued academic and registrant research into the likely cause of any reported problems.

EPA’s decision also imposes further requirements for additional training, timing, record-keeping, and stewardship when using the new dicamba formulations that are designed to reduce or to eliminate those plant injury reports that are not clearly attributable to misuse of the older dicamba products.  EPA will rely on state officials to report and evaluate the experience of users in their respective states, especially concerning whether the additional training and stewardship requirements significantly reduce local injury reports. 


 

By Margaret R. Graham

On September 20, 2018, the U.S. Environmental Protection Agency (EPA) announced it would be hosting a webinar titled “Best Practices for Ground Application” on October 25, 2018, from 2:00 p.m. to 3:30 p.m. (EDT).  The announcement states that this webinar is tailored for “growers, pesticide applicators, pest management professionals, and other interested stakeholders who work in crop production.”

The webinar will be presented by Dr. Greg Kruger, a weed science and application technology specialist from the University of Nebraska-Lincoln and will cover different methods of ground application, best practices for reducing pesticide spray particle drift when using ground application equipment, and a discussion of the optimization of weed control.  Registration is available online.

More information on other pesticide applicator issues, including the Worker Protection Standard, is available on our blog.


 

By Lisa M. Campbell and Susan M. Kirsch

On February 15, 2018, the U.S. Environmental Protection Agency (EPA) added resources to its website regarding the Worker Protection Standard (WPS) and the Application Exclusion Zone (AEZ) requirements of the WPS.  As of January 2, 2018, full compliance is required with all of the AEZ-related requirements in the WPS. The new EPA website resources include:

While many welcome EPA’s guidance on the many thorny issues presented by the WPS and AEZ requirements, some believe that in places, the newly issued guidance raises additional questions and leaves some significant questions unaddressed.  Given the controversy over this rule, this new guidance should be reviewed closely.

More information on the WPS, including EPA’s December 2017 announcement of its intention to revise the AEZ and other WPS provisions, and current implementation deadlines can be found on our blog under key word WPS and key phrase Worker Protection Standard.


 

By Lisa M. Campbell and James V. Aidala

On January 3, 2018, officials with the Arkansas State Plant Board (Plant Board) voted 11 to 3 to uphold its statewide ban of dicamba.  The vote came after a subcommittee of the state's legislative council asked the board to reevaluate its earlier decision. The subcommittee will revisit the Plant Board's decision again on January 16, 2018.  That the subcommittee plans to revisit its decision in just two weeks is noteworthy and illustrates the controversy surrounding this and other similar state bans. 

Commentary

Given the panel will meet again in the next few weeks, this may indicate that the legislature is urging some greater flexibility -- that is, a longer application window that would allow some growers to use the herbicide, along with consideration of any data about the newer formulations designed to reduce the likelihood of drift.

Whether any “flexibility” or additional data will be sufficient to convince the Plant Board that the product can be used without expecting drift incidents in the future is not clear, especially since the issue has become a point of intense political debate.

More information on dicamba issues is available on our blog under key word dicamba.


 

By  James V. AidalaLisa M. Campbelland Timothy D. Backstrom

On December 14, 2017, the Missouri Department of Agriculture (MDA) announced that it issued and collected the first round of fines resulting from investigations regarding the pesticide dicamba.  The news release states that the first wave of civil penalties issued to applicators, all from Dunklin County, were issued as “a result of investigations of complaints during the 2016 growing season,” and the “civil penalties, ranging from $1,500 to $62,250, were issued for pesticide misuse (off label use and drift).”  Further, in 2016, “Department staff conducted and completed 121 complainant investigations.  Those complainants named approximately 60 applicators, who were investigated as a result of complaints. In addition, the Department investigated nearly 100 non-Dicamba related incidents.” 

Commentary

This is the first group of what is anticipated to be a large number of dicamba-related enforcement cases, given the extensive number of, and publicity concerning, the reported incidents involving dicamba.  Reported incidents in Arkansas were even more numerous than those in Missouri.  About one-third of the reported incidents in Missouri have now been attributed to only six applicators.  One applicator alone was cited for 149 discrete violations, which indicates that problems with the new dicamba formulations may be less widespread than some originally feared based on the large number of reported incidents.  Moreover, some of the states where the new dicamba products were widely used have reported very few incidents.  In the aggregate, this data suggests that better stewardship training accompanied by rigorous enforcement may be sufficient to greatly reduce the future incidence of unexpected off-site movement of the new dicamba formulations.

More information on dicamba issues is available in our blog.


 

By Lisa M. Campbell, Timothy D. Backstrom, and James V. Aidala

On October 13, 2017, the U.S. Environmental Protection Agency (EPA) announced that it had reached an agreement with Monsanto, BASF, and DuPont on measures “to further minimize the potential for drift to damage neighboring crops from the use of dicamba formulations used to control weeds in genetically modified cotton and soybeans,” and “new requirements for the use of dicamba ‘over the top’ (application to growing plants) will allow farmers to make informed choices for seed purchases for the 2018 growing season.”

EPA states that in a series of discussions, it “worked cooperatively with states, land-grant universities, and the pesticide manufacturers to examine the underlying causes of recent crop damage in the farm belt and southeast,” “sought extensive input from States and [U.S. Department of Agriculture (USDA)] cooperative extension agents from across the country, as well as the pesticide manufacturers, on the underlying causes of damage,” and “reviewed all available information carefully and developed tangible regulatory changes for the 2018 growing season.”

The label changes that certain registrants of dicamba products have agreed to impose additional requirements for "over the top" use of these products next year.  These new requirements include:

  • Classifying products as "restricted use," permitting only certified applicators with special training, and those under their supervision, to apply them; dicamba-specific training for all certified applicators to reinforce proper use;
  • Requiring farmers to maintain specific records regarding the use of these products to improve compliance with label restrictions;
  • Limiting applications to when maximum wind speeds are below 10 mph (from 15 mph) to reduce potential spray drift;
  • Reducing the times during the day when applications can occur;
  • Including tank clean-out language to prevent cross contamination; and
  • Enhancing susceptible crop language and recordkeeping with sensitive crop registries to increase awareness of risk to especially sensitive crops nearby. 

This announcement follows two compliance advisories issued by EPA in August 2016 and July 2017 on what EPA described as the high number of complaints received regarding crop damage from the alleged misuse of herbicides containing the active ingredient dicamaba.  EPA’s August 2016 compliance advisory stated that the Missouri Department of Agriculture received 117 complaints alleging misuse of pesticide products containing dicamba, and Missouri growers estimated that more than 42,000 acres of crops had been adversely affected.  Further, that similar complaints alleging misuse of dicamba products were received by Alabama, Arkansas, Illinois, Kentucky, Minnesota, Mississippi, North Carolina, Tennessee and Texas.  In the spring of 2016, EPA issued a proposal to register dicamba to control weeds in cotton and soybean that have been genetically engineered to tolerate dicamba.  In November 2016, EPA issued a conditional registration for dicamba on dicamba-tolerant cotton and soybean to Monsanto for its Xtendimax product; and EPA recently approved a label amendment made by Monsanto for Xtendimax which includes “additional restrictions further minimizing off-field movement of the active ingredient dicamba.”

EPA’s July 2017 compliance advisory states that by early July, EPA had received reports of hundreds of complaints to state agencies in Arkansas, Missouri, and Tennessee, a significant increase from 2016; lists the three new conditional registrations issued late last year (including Xtendimax); and states that only these new registered products may be lawfully applied over-the-top of growing soybeans and cotton.  It discusses what it describes as unlawful applications of dicamba products, and states that “[e]xcept for the new conditionally registered dicamba products, application of a dicamba product during either the cotton or soybean crop growing season is unlawful under FIFRA.”

EPA’s July 2017 compliance advisory further states that each of the conditionally approved dicamba herbicide products has labeling that provides mandatory directions for use, restrictions, and special precautions that must be followed, and that the labels of the new products require specific and rigorous drift mitigation measures to further reduce the potential for exposure from spray drift including:

  • No application from aircraft;
  • No application when wind speed is over 15 mph;
  • Application only with approved nozzles at specified pressures; and
  • Buffer zones to protect sensitive areas when the wind is blowing toward them.

Commentary

The reports of and concerns about potential damage to crops in connection with the application of dicamba illustrate a problem that has long been discussed, which is the potential for unintended impact when a pesticide that has been specifically designed for use with one or more crops that have been genetically engineered to be tolerant to the pesticide is applied in close proximity to other crops that do not share these tolerant characteristics. 

The dicamba case also illustrates the differing views on potential misuse issues.  Some observers have questioned whether all of the reported dicamba incidents were due to misuse or misapplication of the product.  Although the 2018 label changes are designed to mitigate the potential for damage to sensitive crops, some question whether some unanticipated or as yet not completely understood factor may be at play in some of the incident reports.  One issue raised by some researchers concerns potential unexpected volatility of the product even when applied according to the label directions by well-trained applicators.  The registrants have disputed this suggestion, but it is an area which will likely be more thoroughly researched over the next few growing seasons.

More information on EPA’s regulatory action on dicamba is available on EPA’s website.


 

By  Lisa M. Campbell and Susan Hunter Youngren, Ph.D.

The California Department of Pesticide Regulation (DPR) announced on February 26, 2015, a revision to the process for evaluation of the potential for a pesticide to move off-site into surface water when the pesticide is used in an urban area. The former evaluation method followed the U.S. Environmental Protection Agency (EPA) approach with California specific parameters. This revision will continue to use the EPA approach but allow incorporation of a module specific for California urban settings.

Potential adverse impacts on surface water from use of pesticides are assessed in California by DPR’s Environmental Monitoring Branch’s Surface Water Protection Program (SWPP) using EPA methodology. The SWPP uses the EPA evaluation method for proposed agricultural pesticide registrations based on PE5 (PRZM-EXAMS version 5) and Tier 2 modeling scenarios but there have been no consistent methods for assessing potential pesticide runoff on impervious surfaces in an urban setting. The new California urban module includes the following improvements that are designed to be further representative of urban conditions in California:

* Introduction of four types of surfaces by permeability and water sources;
* Consideration of pesticide transport induced by dry-weather runoff from impervious surfaces;
* Separation of impervious and pervious portions in the modeling scenarios;
* Use of prescheduled lawn irrigation;
* Characterization of residential and commercial/industrial areas to reflect California urban conditions; and
* Aggregations of water, sediment, and pesticide yields for the urban watershed.

The urban model is designed particularly for evaluating pesticides applied outdoors in areas with large amounts of impervious surfaces such as residential areas, commercial/industrial facilities, and highway and road rights-of-way applications. Pesticide products of interest would be those that have the potential for impact to surface waters through overspray to impervious surfaces in these areas
 


 

By Lisa M. Campbell, James V. Aidala, and Susan Hunter Youngren, Ph.D.

The U.S. Environmental Protection Agency’s (EPA) January 5, 2015, release for public comment of the revised human health risk assessment of chlorpyrifos (http://www.regulations.gov/#!documentDetail;D=EPA-HQ-OPP-2008-0850-0195) reflects another step taken to implement its new spray drift and volatilization policies. These policies were long in the making and the subject of significant discussion and controversy over the years. EPA, with this assessment, has also taken a very public step to implement its controversial policy, announced in December 2009, to apply, effectively, Food Quality Protection Act (FQPA) risk assessment techniques to pesticide uses not subject to FQPA, as part of its commitment to environmental justice.

The spray drift and volatilization policies were discussed in an October 2014 webinar and discussed in our September 17, 2014, memorandum. EPA’s Revised Risk Assessment Methods for Workers, Children of Workers in Agricultural Fields, and Pesticides with No Food Uses, issued in 2009, is discussed in our December 8, 2009, memorandum.

Spray Drift and Volatilization

EPA had been assessing spray drift and volatilization for chlorpyrifos for a number of years, and many of the EPA-derived spray drift and volatilization tools are based on chlorpyrifos data. The January 5 assessment updates the assessment conducted in 2011. This document assesses both potential risks to workers (mixing/loading/applying and re-entry) as well as potential risks to residents (bystanders and food/water consumption). The bystander assessment uses the new tools that EPA released in Spring 2014 to assess potential risks from volatilization and spray drift (as discussed in the B&C webinar). The buffer zones EPA had previously estimated to mitigate spray drift are reduced in the new assessment. The risks noted in the assessment were for workers and specific water areas.

FQPA Risk Assessment Methods Use for Non-FQPA Assessment

In addition to implementing its spray drift and volatilization policies, EPA also assessed exposure in a manner that appears intended to implement the 2009 policy that was the subject of much concern when released for public comment. In that policy, EPA stated its intent to apply risk assessment techniques developed in implementing FQPA’s “extra safety factor” to any pesticide product’s risk assessment, regardless of whether it falls under FQPA, “so long as application of the risk assessment technique is consistent with good scientific practice and is not otherwise prohibited by law.” EPA stated then that this would include “using an additional safety/uncertainty factor to protect children,” as well a number of other factors. EPA announced this policy originally as part of its commitment to considerations of environmental justice.

The chlorpyrifos assessment is based on a physiologically-based, pharmacokinetic-pharmacodynamic (PBPK-PD) model to estimate the toxicologic Points of Departure (POD), thus deriving different toxicological values of concern based on the age, sex, and duration of exposure. The PBPK-PD model is also used to estimate intra-species uncertainty factors (UF), as there is no need for inter-species factors because the model estimates human red blood cell (RBC) acetylcholinesterase/cholinesterase (AChE/ChE) inhibition. Based on the PBPK-PD model, a 10X intra-species factor was used for females of childbearing years whereas it was 4X for all other groups assessed.

The worker of concern in the assessment is defined to be a female of childbearing years due to concern of not only RBC AChE/ChE inhibition, but also the potential for neurodevelopmental effects as seen in epidemiological studies. The epidemiological studies are controversial because there have been many questions about actual exposure to chlorpyrifos, particularly as two studies measured a biomarker that can be seen from exposure to other organophosphates (OP). The Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) Science Advisory Panel (SAP) reviewed EPA’s assessments of these studies in 2008 and 2012. The SAP concluded that “chlorpyrifos likely played a role” in the observed neurodevelopmental outcomes. EPA determined that based on the weight of evidence (WOE) from animal studies and epidemiological studies, reduction of the 10x “FQPA Safety Factor (SF)” was not appropriate. The residential dietary assessments were compared to a Margin of Exposure (MOE) of 100 (10X FQPA SF x 10X intra-species factor) for women and an MOE of 40 (10X FQPA SF x 4X intra-species factor) for all other ages. The occupational assessments were compared to an MOE of 100 for women and 40 for all other age groups (with no explanation of the reasoning behind those values).

This is noteworthy and should be examined closely because EPA has effectively used an additional “FQPA factor” as a safety factor for occupational assessments. EPA stated in its press release announcing the assessment that potential restrictions may be necessary to protect workers and water.

Next Steps

There is a 60-day comment period for this document, which are due on or before March 16, 2015. Among the issues commenters are likely to address include:

     Use of the PBPK-PD model to estimate PODs;

     Use of the PBPK-PD model to estimate intra-species uncertainty factors;

     Use of the epidemiological data; and

     Use of a 10X SF for occupational exposure.

The full impact of this assessment is not yet clear, but it raises many issues of interest to registrants.
 


 

By Susan Hunter Youngren, Ph.D.

On October 15, 2014, the Office of Pesticide Programs (OPP) announced a voluntary program to document the effectiveness of agricultural pesticide spray application technologies on reducing pesticide spray drift. Under the Drift Reduction Technology (DRT) Program, agricultural equipment manufacturers would conduct (or make arrangements for a testing facility to conduct) studies to determine the percent drift reduction according to a verification protocol. Once completed, the manufacturer would submit the study to the U.S. Environmental Protection Agency (EPA) for review and evaluation. As verified, these reductions could then be quantitatively credited in the environmental risk assessments used to develop the drift reduction measures appearing on the label of the pesticide product. EPA will then review the manufacturers’ studies and, based on these data, it will assign spraying devices a rating on a four-star scale:

* Four stars: Device can reduce spray drift by 90 percent or more.

* Three stars: Device can reduce spray drift by between 75 percent to 89 percent.

* Two stars: Device can reduce spray drift by between 50 percent to 74 percent.

* One star: Device can reduce spray drift by between 25 percent to 49 percent.

* No stars: Device can reduce spray drift by less than 25 percent.

EPA allows pesticide manufacturers to include labeling on their products that contain dual-use instructions, one for farmers using devices that have received stars through the DRT program and another for those using devices that do not have a DRT rating.
 


 
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