Herbicide label
SHARK H2O Herbicide Label
SHARK H2O (EPA 279-3194) is a Group 14 carfentrazone-ethyl herbicide labeled for 2 crops. The label lists 2 controlled weeds, plus partial-control, suppression, and partner-control categories.
“SHARK H2O Herbicide is a contact PPO (protoporphyrinogen oxidase) herbicide.”
SHARK H2O label facts
- Product SHARK H2O
- EPA Reg. No. 279-3194
- Registrant FMC Corporation
- Active ingredient carfentrazone-ethyl
- MOA group 14
Crops on the SHARK H2O label
SHARK H2O is labeled for these 2 crops and uses, per the EPA label.
Weeds on the SHARK H2O label
The SHARK H2O label names 7 weeds and rates each by how the product handles it: full control, partial control, suppression, or control with a tank-mix partner. A weed can fall at more than one level, because control varies by crop, rate, and timing.
Controls
full control2- arrowhead, california
- bulrush, ricefield
Suppression
suppression5- ammannia, purple
- ammannia, redstem
- umbrellaplant, smallflower
- burrweed, giant
- water plantain
SHARK H2O rates and plant-back
The label answers both with a table, not a single number. Here is what drives each answer.
Application rate
Your rate depends on your crop.
Get the rate for your field: build a program and FieldMarshal gives you the exact per-acre rate for your crop from the label line.
Plant-back and rotation
Your interval depends on your application rate and the rotational crop.
Get the interval for your rotation: build a program and FieldMarshal gives you the exact plant-back for your rotational crop from the label line.
SHARK H2O FAQ
What weeds does SHARK H2O control?
The SHARK H2O label names 7 weeds, including california arrowhead and ricefield bulrush. Control varies by crop, rate, and timing.
What crops is SHARK H2O labeled for?
SHARK H2O is labeled for 2 crops and uses, including rice and wild rice.
What is the active ingredient in SHARK H2O? Is it a generic?
SHARK H2O's active ingredient is carfentrazone-ethyl (MOA Group 14). Other products list the same active ingredient; rates, formulations, and labeled crops differ — verify each on its own label.
Sources
Last updated 2026-09-30.