crop-chem-docs/corpus/epa_ppls/241-418.md

# PROWL H2O HERBICIDE

- EPA Reg No: **241-418**
- Registrant: BASF AGRICULTURAL SOLUTIONS US LLC
- Signal word: Caution
- Active ingredients: Pendimethalin (38.7%)
- Label accepted: 2026-08-19
- Source PDF: https://www3.epa.gov/pesticides/chem_search/ppls/000241-00418-20260819.pdf

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Supplemental Label Acceptable v.20150113 
 
August 19, 2026 
 
Christa Ellers-Kirk 
Regulatory Affairs Manager 
BASF Agricultural Solutions US LLC 
2 TW Alexander Drive 
Research Triangle Park, NC 27713 
 
Subject: Amendment to Renew a Supplementa l Label – to renew the Prowl H2O herbicide 
supplemental label for weed control as a delayed preemergence treatment in dry 
bulb onion for use on the Navajo Nation. 
 Product Name: Prowl® H2O Herbicide 
 EPA Registration Number: 241-418 
 Application Date: July 15, 2026 
 Case Number: 711204 
 
Dear Christa Ellers-Kirk: 
 
The amended label referred to above, submitted in connection with registration under the Federal 
Insecticide, Fungicide and Rodenticide Act, as amended, is acceptable. This approval is only for 
a supplemental label that is an addendum to the master label. This approval does not affect any 
conditions that were previously imposed on this registration. You continue to be subject to 
existing conditions on your registration and any deadlines connected with them. 
 
This supplemental labeling contains some new and/or revised uses and/or directions which may 
be additional to the uses and/or directions found on the label on or attached to the container, but 
this supplemental labeling does not by itself constitute the complete set of use directions. The 
complete set of use directions is set forth on the container label as combined with this 
supplemental labeling. 
 
This supplemental label expires August 19, 2029, and must not be used or distributed after 
this date. 
 
A stamped copy of your labeling is enclosed for your records. You must submit one copy of the 
final printed labeling before you release the product for shipment with the new labeling. 
 
Your release for shipment of the product constitutes acceptance of these conditions. If these 
conditions are not complied with, the registration will be subject to cancellation in accordance 
with FIFRA section 6. If you have any questions, please contact Ralph Narain via email at 
Narain.Ralph@epa.gov.

Page 2 of 2 
EPA Reg. No. 241-418 
Case No. 711204 
 
 
Sincerely, 
 
Elizabeth Andrews, PM 01 
Invertebrate and Vertebrate Branch 3 
Registration Division (7505T) 
Office of Pesticide Programs 
 
 
Enclosure: Stamped label

BASF Agricultural Solutions US LLC 
2 TW Alexander Drive 
Research Triangle Park, NC 27713 
Supplemental Label
FOR WEED CONTROL AS A DELAYED PREEMERGENCE TREATMENT IN 
DRY BULB ONIONS 
FOR DISTRIBUTION AND USE ONLY WITHIN THE NAVAJO NATION 
This supplemental label expires August 19, 2029, and must not be used or distributed after this date. 
Active Ingredient*: 
pendimethalin: N-(1-ethylpropyl)-3,4-dimethyl-2,6-dinitrobenzenamine ...................................................... 38.7% 
Other Ingredients: ..................................................................................................................................... 61.3% 
Total: ........................................................................................................................................................... 100.0% 
*1 gallon contains 3.8 pounds of pendimethalin formulated as an aqueous capsule suspension.
EPA Reg. No. 241- 418 
CAUTION/PRECAUCION 
OBSERVE AND FOLLOW ALL APPLICABLE DIRECTIONS, RESTRICTIONS, WORKER PROTECTION 
STANDARD REQUIREMENTS, PRECAUTIONARY STATEMENTS, MIXING AND APPLICATION 
INSTRUCTIONS, AND FOLLOWCROP RESTRICTIONS ON THE Prowl ® H2O herbicide MAIN CONTAINER 
LABEL BEFORE USING. 
DISCLAIMER 
BASF Agricultural Solutions US LLC (hereafter “BASF”) INTENDS THAT THIS SUPPLEMENTAL LABEL BE 
DISTRIBUTED ONLY BY THE NAVAJO AGRICULTURAL PRODUCTS INDUSTRY (NAPI) TO END USERS 
AND/OR GROWERS WHO AGREE IN WRITING TO THE TERMS AND CONDITIONS REQUIRED BY NAPI 
INCLUDING A WAIVER WHICH IS IN ACCORDANCE WITH THE FULLEST EXTENT PERMITTED BY LAW 
AND RELEASE FROM ALL LIABILITY AND INDEMNIFICATION BY THE USER AND/OR GROWER OF BASF, 
NAPI, AND OTHERS FROM FAILURE TO PERFORM AND CROP DAMAGE FROM USE OF Prowl H2O AS A 
DELAYED PREEMERGENCE TREATMENT ON DRY BULB ONIONS. IF SUCH TERMS AND CONDITIONS 
ARE UNACCEPTABLE, RETURN THE Prowl H2O AT ONCE UNOPENED. 
Prowl H2O USE MAY RESULT IN CROP INJURY, LOSS OR DAMAGE. IN ADDITION, MANY FACTORS, 
INCLUDING INSECTS, DISEASES, WEED COMPETITION, POOR SEED QUALITY, IMPROPER PLANTING 
DEPTH, MECHANICAL CULTIVATION, POOR WEATHER (SUCH AS FREEZING OR EXCESSIVE WIND, 
RAIN, HEAT, OR COLD), LACK OF OR EXCESSIVE MOISTURE, CRUSTING, FERTILITY, OR HARDPANS, 
CAN AFFECT CROP GROWTH AND/OR YIELD. 
EACH GROWER WHO IS CONSIDERING THE PRODUCT FOR SUCH USE SHOULD TEST Prowl H2O IN 
ORDER TO DETERMINE ITS SUITABILITY. A GROWER SHOULD USE Prowl H2O ONLY TO THE EXTENT 
THAT IN HIS SOLE OPINION THE BENEFIT OF Prowl H2O USE OUTWEIGHS THE POTENTIAL INJURY TO 
THE GROWER'S CROP. 
NUMEROUS RISKS OF LOSS OR DAMAGE TO DRY BULB ONION CROPS MAY BE ASSOCIATED WITH 
THE USE OF Prowl H2O, EVEN WHEN Directions For Use ARE FOLLOWED COMPLETELY. THESE 
INCLUDE SWELLING OF ROOTS OR OTHER BELOW-GROUND PLANT PARTS, LESS VIGOROUS PLANT 
GROWTH AND DEVELOPMENT, AND REDUCTION IN YIELD POTENTIAL. Prowl H2O MAY ALSO CAUSE 
INJURY TO SENSITIVE ROTATIONAL CROPS. THE USER OR GROWER SHOULD TAKE ALL SUCH RISKS 
INTO CONSIDERATION BEFORE DECIDING TO APPLY THE PRODUCT. 
Pendimethalin Group 3 Herbicide 
8/19/2026
241-418

2 
Directions For Use 
It is a violation of federal law to use this product in 
a manner inconsistent with its labeling. This label 
and the current EPA-accepted label for 
Prowl® H2O herbicide, EPA Reg. No. 241-418, 
must be in the possession of the user at the time 
of pesticide application. 
Read the label affixed to the container for 
Prowl H2O before applying. 
Observe all cautions and limitations on this label 
and on the labels of products used in combination 
with Prowl H2O. Always follow the most 
restrictive label. DO NOT use Prowl H2O other 
than in accordance with the instructions set forth 
on this label. The use of Prowl H2O not 
consistent with this label may result in injury to 
crops. Keep containers closed to avoid spills and 
contamination. 
Endangered Species Protection 
This product may have effects on federally listed 
threatened or endangered plant species or their 
critical habitat. When using this product, you must 
follow the measures contained in the Endangered 
Species Protection Bulletin for the county or 
parish in which you are applying the pesticide. To 
determine whether your county or parish has a 
Bulletin, and to obtain that Bulletin, consult 
http://www.epa.gov/espp/, or call 1-800-447-3813 
no more than 6 months before using this product. 
Applicators must use Bulletins that are in effect in 
the month in which the pesticide will be applied. 
New Bulletins will generally be available from the 
above sources 6 months prior to their effective 
dates. 
If endangered plant species occur in proximity to 
the application site, the following mitigation 
measures are required: 
 If applied by ground, leave untreated buffer 
zone of 200 feet. The product must be applied 
using a low boom (20 inches above the ground) 
and ASAE fine to medium/coarse nozzles. 
SPRAY DRIFT. Avoiding spray drift at the 
application site is the responsibility of the 
applicator and the grower. The interaction of many 
equipment-related and weather-related factors 
determines the potential for spray drift. The 
applicator and grower are responsible for 
considering all these factors when making 
decisions. It is the responsibility of the applicator 
to avoid spray drift onto nontarget areas. 
Product Information 
Prowl H2O may be applied for preemergence 
weed control of most annual grasses and certain 
broadleaf weeds as they germinate, but it will not 
control established weeds. Unusually cold, 
excessively wet, or hot and dry conditions that 
delay germination or extend it over a long period 
of time may reduce weed control. 
Overapplication can result in crop stand loss, crop 
injury, or rotational crop injury. 
Uneven application or improper soil incorporation 
can decrease weed control or cause crop injury. 
Soil incorporation deeper than recommended can 
reduce weed control. 
Seedling diseases, cold weather, excessive 
moisture, shallow or deep planting, low or high 
soil pH, high soil salt concentration, or drought 
can weaken seedlings and plants and increase 
the possibility of crop damage from Prowl H2O. 
Under these conditions, crop yields can be 
reduced. 
Use of Prowl H2O in accordance with label 
directions is expected to result in normal growth of 
rotational crops in most situations; however, 
various environmental and agronomic factors 
make it impossible to eliminate all risks associated 
with the use of this product and, therefore, 
rotational crop injury is always possible. 
Application Instructions 
For control of annual grass and small seeded 
broadleaf weeds as specified in the Prowl H2O 
container label, uniformly plant dry bulb onions 
1-inch deep and ensure that the furrow is 
thoroughly covered with soil. Failure to plant dry 
bulb onions a minimum of 1-inch deep in the 
soil increases the injury potential. 
Apply Prowl H2O after germination of the onion 
seed but prior to emergence (delayed 
preemergence) when 75% of the radicals have 
developed on the onion seedlings. Radical 
emergence should be determined by digging 
onion seedlings at random locations in a field and 
noting radical elongation. 
Apply Prowl H2O at rates on mineral soils 
specified in the following table. Prowl H2O will not 
control emerged weeds. For effective weed 
control, Prowl H2O must be applied to clean-tilled 
soil or tank mixed with a burndown herbicide to 
control emerged weeds prior to onion emergence. 
Uniformly apply in 10 or more gallons of water per 
acre with ground equipment.

3 
Prowl® H2O herbicide is most effective when 
adequately incorporated by rainfall or irrigation. 
DO NOT apply more than 0.25 inches of initial 
overhead irrigation following delayed 
preemergence application of Prowl H2O on dry 
bulb onions. 
Application Rates 
Prowl H2O Broadcast Rate per Acre 
Delayed Preemergence Treatment 
in Dry Bulb Onions 
Mineral 
Soil(s) 
Texture 
Prowl H2O 
Rate 
(pints/Acre) 
Prowl H2O 
Rate 
(lbs ai/Acre) 
Coarse 1.0 to 2.0 0.48 to 0.95 
Medium 1.5 to 2.5 0.71 to 1.19 
Fine 1.5 to 3.0 0.71 to 1.43 
Notes: 
1. On coarse-textured soils (> 90% sand 
content), the risk of crop injury is greater than 
with medium-textured or fine-textured soils. 
Potential injury may be due to variability within 
soil type. 
2. Higher use rates of Prowl H2O within soil 
types may result in greater chances of crop 
injury. 
3. If loss of onions occurs due to adverse 
weather conditions, any crop registered for 
Prowl H2O preplant incorporated use can be 
replanted the same year into Prowl H2O-
treated soil without adverse effects. If 
replanting is necessary, soil should not be 
reworked deeper than 2 inches. 
Prowl H2O may be applied sequentially in dry 
bulb seeded onions. Apply first application of 
Prowl H2O delayed preemergence according to 
this supplemental label. Apply sequential 
applications of Prowl H2O early postemergence 
(up to 9th true-leaf stage) according to the 
Prowl H2O main label. 
Restrictions and Limitations 
DO NOT exceed the maximum labeled rate for a 
given mineral soil texture. 
DO NOT exceed a total of 3.0 pints of 
Prowl H2O per acre per year. 
DO NOT apply this product through any type of 
irrigation system or by air. 
DO NOT apply preplant incorporated or preplant. 
DO NOT apply within 45 days of harvest. 
DO NOT feed or graze for livestock.

4 
Conditions of Sale and Warranty 
 
The Directions For Use of this product reflect 
the opinion of experts based on field use and 
tests. The directions are believed to be reliable 
and must be followed carefully. However, it is 
impossible to eliminate all risks inherently 
associated with the use of this product. Crop 
injury, ineffectiveness or other unintended 
consequences may result because of such 
factors as weather conditions, presence of other 
materials, or use of the product in a manner 
inconsistent with its labeling, all of which are 
beyond the control of BASF Agricultural 
Solutions US LLC (“BASF”) or the Seller. To the 
extent consistent with applicable law, all such 
risks shall be assumed by the Buyer. 
 
BASF warrants that this product conforms to the 
chemical description on the label and is 
reasonably fit for the purposes referred to in the 
Directions For Use, subject to the inherent 
risks, referred to above. 
 
TO THE EXTENT CONSISTENT WITH 
APPLICABLE LAW, BASF MAKES NO 
OTHER EXPRESS OR IMPLIED WARRANTY 
OF FITNESS OR MERCHANTABILITY OR 
ANY OTHER EXPRESS OR IMPLIED 
WARRANTY. 
TO THE EXTENT CONSISTENT WITH 
APPLICABLE LAW, BUYER’S EXCLUSIVE 
REMEDY AND BASF’S EXCLUSIVE 
LIABILITY, WHETHER IN CONTRACT, TORT, 
NEGLIGENCE, STRICT LIABILITY, OR 
OTHERWISE, SHALL BE LIMITED TO 
REPAYMENT OF THE PURCHASE PRICE OF 
THE PRODUCT. 
 
TO THE EXTENT CONSISTENT WITH 
APPLICABLE LAW, BASF AND THE SELLER 
DISCLAIM ANY LIABILITY FOR 
CONSEQUENTIAL, EXEMPLARY, SPECIAL 
OR INDIRECT DAMAGES RESULTING FROM 
THE USE OR HANDLING OF THIS PRODUCT. 
BASF and the Seller offer this product, and the 
Buyer and User accept it, subject to the 
foregoing Conditions of Sale and Warranty 
which may be varied only by agreement in 
writing signed by a duly authorized 
representative of BASF. 1108 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Prowl is a registered trademark of BASF. 
 
© 2026 BASF Agricultural Solutions US LLC 
All rights reserved. 
 
000241-00418.20260714.NVA 2026-04-0195-0153 
Supersedes: NVA 2025-04-0195-0005 
 
BASF Agricultural Solutions US LLC 
2 TW Alexander Drive 
Research Triangle Park, NC 27713