388 lines
14 KiB
Markdown
388 lines
14 KiB
Markdown
# PROWL H2O HERBICIDE
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- EPA Reg No: **241-418**
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- Registrant: BASF AGRICULTURAL SOLUTIONS US LLC
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- Signal word: Caution
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- Active ingredients: Pendimethalin (38.7%)
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- Label accepted: 2026-08-19
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- Source PDF: https://www3.epa.gov/pesticides/chem_search/ppls/000241-00418-20260819.pdf
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---
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Supplemental Label Acceptable v.20150113
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August 19, 2026
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Christa Ellers-Kirk
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Regulatory Affairs Manager
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BASF Agricultural Solutions US LLC
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2 TW Alexander Drive
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Research Triangle Park, NC 27713
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Subject: Amendment to Renew a Supplementa l Label – to renew the Prowl H2O herbicide
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supplemental label for weed control as a delayed preemergence treatment in dry
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bulb onion for use on the Navajo Nation.
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Product Name: Prowl® H2O Herbicide
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EPA Registration Number: 241-418
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Application Date: July 15, 2026
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Case Number: 711204
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Dear Christa Ellers-Kirk:
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The amended label referred to above, submitted in connection with registration under the Federal
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Insecticide, Fungicide and Rodenticide Act, as amended, is acceptable. This approval is only for
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a supplemental label that is an addendum to the master label. This approval does not affect any
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conditions that were previously imposed on this registration. You continue to be subject to
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existing conditions on your registration and any deadlines connected with them.
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This supplemental labeling contains some new and/or revised uses and/or directions which may
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be additional to the uses and/or directions found on the label on or attached to the container, but
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this supplemental labeling does not by itself constitute the complete set of use directions. The
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complete set of use directions is set forth on the container label as combined with this
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supplemental labeling.
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This supplemental label expires August 19, 2029, and must not be used or distributed after
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this date.
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A stamped copy of your labeling is enclosed for your records. You must submit one copy of the
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final printed labeling before you release the product for shipment with the new labeling.
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Your release for shipment of the product constitutes acceptance of these conditions. If these
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conditions are not complied with, the registration will be subject to cancellation in accordance
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with FIFRA section 6. If you have any questions, please contact Ralph Narain via email at
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Narain.Ralph@epa.gov.
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Page 2 of 2
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EPA Reg. No. 241-418
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Case No. 711204
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Sincerely,
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Elizabeth Andrews, PM 01
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Invertebrate and Vertebrate Branch 3
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Registration Division (7505T)
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Office of Pesticide Programs
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Enclosure: Stamped label
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BASF Agricultural Solutions US LLC
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2 TW Alexander Drive
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Research Triangle Park, NC 27713
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Supplemental Label
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FOR WEED CONTROL AS A DELAYED PREEMERGENCE TREATMENT IN
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DRY BULB ONIONS
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FOR DISTRIBUTION AND USE ONLY WITHIN THE NAVAJO NATION
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This supplemental label expires August 19, 2029, and must not be used or distributed after this date.
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Active Ingredient*:
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pendimethalin: N-(1-ethylpropyl)-3,4-dimethyl-2,6-dinitrobenzenamine ...................................................... 38.7%
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Other Ingredients: ..................................................................................................................................... 61.3%
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Total: ........................................................................................................................................................... 100.0%
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*1 gallon contains 3.8 pounds of pendimethalin formulated as an aqueous capsule suspension.
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EPA Reg. No. 241- 418
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CAUTION/PRECAUCION
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OBSERVE AND FOLLOW ALL APPLICABLE DIRECTIONS, RESTRICTIONS, WORKER PROTECTION
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STANDARD REQUIREMENTS, PRECAUTIONARY STATEMENTS, MIXING AND APPLICATION
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INSTRUCTIONS, AND FOLLOWCROP RESTRICTIONS ON THE Prowl ® H2O herbicide MAIN CONTAINER
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LABEL BEFORE USING.
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DISCLAIMER
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BASF Agricultural Solutions US LLC (hereafter “BASF”) INTENDS THAT THIS SUPPLEMENTAL LABEL BE
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DISTRIBUTED ONLY BY THE NAVAJO AGRICULTURAL PRODUCTS INDUSTRY (NAPI) TO END USERS
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AND/OR GROWERS WHO AGREE IN WRITING TO THE TERMS AND CONDITIONS REQUIRED BY NAPI
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INCLUDING A WAIVER WHICH IS IN ACCORDANCE WITH THE FULLEST EXTENT PERMITTED BY LAW
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AND RELEASE FROM ALL LIABILITY AND INDEMNIFICATION BY THE USER AND/OR GROWER OF BASF,
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NAPI, AND OTHERS FROM FAILURE TO PERFORM AND CROP DAMAGE FROM USE OF Prowl H2O AS A
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DELAYED PREEMERGENCE TREATMENT ON DRY BULB ONIONS. IF SUCH TERMS AND CONDITIONS
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ARE UNACCEPTABLE, RETURN THE Prowl H2O AT ONCE UNOPENED.
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Prowl H2O USE MAY RESULT IN CROP INJURY, LOSS OR DAMAGE. IN ADDITION, MANY FACTORS,
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INCLUDING INSECTS, DISEASES, WEED COMPETITION, POOR SEED QUALITY, IMPROPER PLANTING
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DEPTH, MECHANICAL CULTIVATION, POOR WEATHER (SUCH AS FREEZING OR EXCESSIVE WIND,
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RAIN, HEAT, OR COLD), LACK OF OR EXCESSIVE MOISTURE, CRUSTING, FERTILITY, OR HARDPANS,
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CAN AFFECT CROP GROWTH AND/OR YIELD.
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EACH GROWER WHO IS CONSIDERING THE PRODUCT FOR SUCH USE SHOULD TEST Prowl H2O IN
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ORDER TO DETERMINE ITS SUITABILITY. A GROWER SHOULD USE Prowl H2O ONLY TO THE EXTENT
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THAT IN HIS SOLE OPINION THE BENEFIT OF Prowl H2O USE OUTWEIGHS THE POTENTIAL INJURY TO
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THE GROWER'S CROP.
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NUMEROUS RISKS OF LOSS OR DAMAGE TO DRY BULB ONION CROPS MAY BE ASSOCIATED WITH
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THE USE OF Prowl H2O, EVEN WHEN Directions For Use ARE FOLLOWED COMPLETELY. THESE
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INCLUDE SWELLING OF ROOTS OR OTHER BELOW-GROUND PLANT PARTS, LESS VIGOROUS PLANT
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GROWTH AND DEVELOPMENT, AND REDUCTION IN YIELD POTENTIAL. Prowl H2O MAY ALSO CAUSE
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INJURY TO SENSITIVE ROTATIONAL CROPS. THE USER OR GROWER SHOULD TAKE ALL SUCH RISKS
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INTO CONSIDERATION BEFORE DECIDING TO APPLY THE PRODUCT.
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Pendimethalin Group 3 Herbicide
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8/19/2026
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241-418
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2
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Directions For Use
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It is a violation of federal law to use this product in
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a manner inconsistent with its labeling. This label
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and the current EPA-accepted label for
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Prowl® H2O herbicide, EPA Reg. No. 241-418,
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must be in the possession of the user at the time
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of pesticide application.
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Read the label affixed to the container for
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Prowl H2O before applying.
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Observe all cautions and limitations on this label
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and on the labels of products used in combination
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with Prowl H2O. Always follow the most
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restrictive label. DO NOT use Prowl H2O other
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than in accordance with the instructions set forth
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on this label. The use of Prowl H2O not
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consistent with this label may result in injury to
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crops. Keep containers closed to avoid spills and
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contamination.
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Endangered Species Protection
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This product may have effects on federally listed
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threatened or endangered plant species or their
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critical habitat. When using this product, you must
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follow the measures contained in the Endangered
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Species Protection Bulletin for the county or
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parish in which you are applying the pesticide. To
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determine whether your county or parish has a
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Bulletin, and to obtain that Bulletin, consult
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http://www.epa.gov/espp/, or call 1-800-447-3813
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no more than 6 months before using this product.
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Applicators must use Bulletins that are in effect in
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the month in which the pesticide will be applied.
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New Bulletins will generally be available from the
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above sources 6 months prior to their effective
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dates.
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If endangered plant species occur in proximity to
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the application site, the following mitigation
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measures are required:
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If applied by ground, leave untreated buffer
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zone of 200 feet. The product must be applied
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using a low boom (20 inches above the ground)
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and ASAE fine to medium/coarse nozzles.
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SPRAY DRIFT. Avoiding spray drift at the
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application site is the responsibility of the
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applicator and the grower. The interaction of many
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equipment-related and weather-related factors
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determines the potential for spray drift. The
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applicator and grower are responsible for
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considering all these factors when making
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decisions. It is the responsibility of the applicator
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to avoid spray drift onto nontarget areas.
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Product Information
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Prowl H2O may be applied for preemergence
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weed control of most annual grasses and certain
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broadleaf weeds as they germinate, but it will not
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control established weeds. Unusually cold,
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excessively wet, or hot and dry conditions that
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delay germination or extend it over a long period
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of time may reduce weed control.
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Overapplication can result in crop stand loss, crop
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injury, or rotational crop injury.
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Uneven application or improper soil incorporation
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can decrease weed control or cause crop injury.
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Soil incorporation deeper than recommended can
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reduce weed control.
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Seedling diseases, cold weather, excessive
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moisture, shallow or deep planting, low or high
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soil pH, high soil salt concentration, or drought
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can weaken seedlings and plants and increase
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the possibility of crop damage from Prowl H2O.
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Under these conditions, crop yields can be
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reduced.
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Use of Prowl H2O in accordance with label
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directions is expected to result in normal growth of
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rotational crops in most situations; however,
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various environmental and agronomic factors
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make it impossible to eliminate all risks associated
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with the use of this product and, therefore,
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rotational crop injury is always possible.
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Application Instructions
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For control of annual grass and small seeded
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broadleaf weeds as specified in the Prowl H2O
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container label, uniformly plant dry bulb onions
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1-inch deep and ensure that the furrow is
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thoroughly covered with soil. Failure to plant dry
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bulb onions a minimum of 1-inch deep in the
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soil increases the injury potential.
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Apply Prowl H2O after germination of the onion
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seed but prior to emergence (delayed
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preemergence) when 75% of the radicals have
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developed on the onion seedlings. Radical
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emergence should be determined by digging
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onion seedlings at random locations in a field and
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noting radical elongation.
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Apply Prowl H2O at rates on mineral soils
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specified in the following table. Prowl H2O will not
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control emerged weeds. For effective weed
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control, Prowl H2O must be applied to clean-tilled
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soil or tank mixed with a burndown herbicide to
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control emerged weeds prior to onion emergence.
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Uniformly apply in 10 or more gallons of water per
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acre with ground equipment.
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3
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Prowl® H2O herbicide is most effective when
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adequately incorporated by rainfall or irrigation.
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DO NOT apply more than 0.25 inches of initial
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overhead irrigation following delayed
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preemergence application of Prowl H2O on dry
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bulb onions.
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Application Rates
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Prowl H2O Broadcast Rate per Acre
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Delayed Preemergence Treatment
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in Dry Bulb Onions
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Mineral
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Soil(s)
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Texture
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Prowl H2O
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Rate
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(pints/Acre)
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Prowl H2O
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Rate
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(lbs ai/Acre)
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Coarse 1.0 to 2.0 0.48 to 0.95
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Medium 1.5 to 2.5 0.71 to 1.19
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Fine 1.5 to 3.0 0.71 to 1.43
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Notes:
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1. On coarse-textured soils (> 90% sand
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content), the risk of crop injury is greater than
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with medium-textured or fine-textured soils.
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Potential injury may be due to variability within
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soil type.
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2. Higher use rates of Prowl H2O within soil
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types may result in greater chances of crop
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injury.
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3. If loss of onions occurs due to adverse
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weather conditions, any crop registered for
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Prowl H2O preplant incorporated use can be
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replanted the same year into Prowl H2O-
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treated soil without adverse effects. If
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replanting is necessary, soil should not be
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reworked deeper than 2 inches.
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Prowl H2O may be applied sequentially in dry
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bulb seeded onions. Apply first application of
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Prowl H2O delayed preemergence according to
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this supplemental label. Apply sequential
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applications of Prowl H2O early postemergence
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(up to 9th true-leaf stage) according to the
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Prowl H2O main label.
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Restrictions and Limitations
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DO NOT exceed the maximum labeled rate for a
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given mineral soil texture.
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DO NOT exceed a total of 3.0 pints of
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Prowl H2O per acre per year.
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DO NOT apply this product through any type of
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irrigation system or by air.
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DO NOT apply preplant incorporated or preplant.
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DO NOT apply within 45 days of harvest.
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DO NOT feed or graze for livestock.
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4
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Conditions of Sale and Warranty
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The Directions For Use of this product reflect
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the opinion of experts based on field use and
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tests. The directions are believed to be reliable
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and must be followed carefully. However, it is
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impossible to eliminate all risks inherently
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associated with the use of this product. Crop
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injury, ineffectiveness or other unintended
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consequences may result because of such
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factors as weather conditions, presence of other
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materials, or use of the product in a manner
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inconsistent with its labeling, all of which are
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beyond the control of BASF Agricultural
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Solutions US LLC (“BASF”) or the Seller. To the
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extent consistent with applicable law, all such
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risks shall be assumed by the Buyer.
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BASF warrants that this product conforms to the
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chemical description on the label and is
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reasonably fit for the purposes referred to in the
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Directions For Use, subject to the inherent
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risks, referred to above.
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TO THE EXTENT CONSISTENT WITH
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APPLICABLE LAW, BASF MAKES NO
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OTHER EXPRESS OR IMPLIED WARRANTY
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OF FITNESS OR MERCHANTABILITY OR
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ANY OTHER EXPRESS OR IMPLIED
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WARRANTY.
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TO THE EXTENT CONSISTENT WITH
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APPLICABLE LAW, BUYER’S EXCLUSIVE
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REMEDY AND BASF’S EXCLUSIVE
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LIABILITY, WHETHER IN CONTRACT, TORT,
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NEGLIGENCE, STRICT LIABILITY, OR
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OTHERWISE, SHALL BE LIMITED TO
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REPAYMENT OF THE PURCHASE PRICE OF
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THE PRODUCT.
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TO THE EXTENT CONSISTENT WITH
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APPLICABLE LAW, BASF AND THE SELLER
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DISCLAIM ANY LIABILITY FOR
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CONSEQUENTIAL, EXEMPLARY, SPECIAL
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OR INDIRECT DAMAGES RESULTING FROM
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THE USE OR HANDLING OF THIS PRODUCT.
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BASF and the Seller offer this product, and the
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Buyer and User accept it, subject to the
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foregoing Conditions of Sale and Warranty
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which may be varied only by agreement in
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writing signed by a duly authorized
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representative of BASF. 1108
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Prowl is a registered trademark of BASF.
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© 2026 BASF Agricultural Solutions US LLC
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All rights reserved.
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000241-00418.20260714.NVA 2026-04-0195-0153
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Supersedes: NVA 2025-04-0195-0005
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BASF Agricultural Solutions US LLC
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2 TW Alexander Drive
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Research Triangle Park, NC 27713
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