Herbicide label
SHARK H2O
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.
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“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.
Need the rate or timing for one of these? Filter every label by your crop, free.
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
- burrweed, giant
- umbrellaplant, smallflower
- water plantain
Want the control level for your crop, or to filter 1,700+ labels by any of these weeds? Use the free label filter.
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.
What's the plant-back interval after SHARK H2O?
It depends on your rotational crop, application rate, and region, so the label gives a table, not one number. Build a program and FieldMarshal gives you the exact interval for your rotation from the label line, so you can verify it.
Build a program →Can I tank-mix SHARK H2O?
It depends on your target weeds, crop stage, and which partners the label approves. Build a program and FieldMarshal checks the label for approved partners and gives the condition on each, so you can verify it.
Build a program →Plan in minutes, not hours.
Start with SHARK H2O and let FieldMarshal build a defensible herbicide program for your field, every product, rate, and plant-back cross-referenced and checked against the label.
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Sources
Last updated 2026-07-14.