HomePenoxsulam vs Cyhalofop Butyl in Rice Weed Control
Penoxsulam vs Cyhalofop Butyl in Rice Weed Control
Two rice herbicides with different modes of action. One handles sedges and broadleaves, the other targets grasses. Here's how they compare.
Two Actives for Different Weed Spectra
Penoxsulam is a triazolopyrimidine sulfonamide herbicide. It's an ALS inhibitor, so it stops branched-chain amino acid synthesis. In rice it's used mainly on sedges, broadleaves, and some annual grasses. It moves systemically, which helps on emerged weeds.
Cyhalofop-butyl is an aryloxyphenoxypropionate herbicide. It inhibits ACCase, an enzyme grasses need for fatty acid synthesis. It's selective in rice and mainly targets annual grassy weeds like barnyardgrass and Leptochloa chinensis. It has limited activity on broadleaves and sedges.
How the Two Herbicides Differ
| Aspect | Penoxsulam | Cyhalofop-butyl |
|---|---|---|
| Chemical class | Triazolopyrimidine sulfonamide | Aryloxyphenoxypropionate |
| Mode of action | ALS inhibitor | ACCase inhibitor |
| Main targets | Sedges, broadleaves, some grasses | Annual grasses |
| Systemic or contact | Systemic | Systemic |
| Typical formulation | OD, SC, WG | EC, OD |
| Resistance management role | Useful in mixtures to broaden spectrum | Useful in mixtures to broaden spectrum |
| Tank-mix notes | Check compatibility with grass herbicides | Check compatibility with broadleaf herbicides |
Choosing Between Penoxsulam and Cyhalofop
If your main pressure is grassy weeds like barnyardgrass or Leptochloa chinensis, cyhalofop-butyl is the usual first choice. It's tough on grasses and gentle on rice. If sedges or broadleaves dominate, penoxsulam covers that spectrum better.
Many rice fields have mixed weed flushes. That's where a penoxsulam cyhalofop mixture helps. CHICO offers CUTTING® Cyhalofop-butyl 15% + Penoxsulam 3% 18% OD. It combines both actives in one oil dispersion. Check the label of your registered product for local use rates and weed coverage.
Questions Buyers Ask
Can I tank mix penoxsulam and cyhalofop-butyl?
Yes, many growers do. But compatibility depends on the formulations. A ready-made mixture like CUTTING® 18% OD avoids mixing errors. Always confirm with your registrant and do a jar test if you mix your own.
Which one is safer on rice?
Both are selective in rice when used as directed. Cyhalofop-butyl is known for good rice safety on grasses. Penoxsulam can stress rice under certain conditions. Follow the label of your registered product.
Does the mixture control all weeds in one pass?
It covers many annual grasses, sedges, and broadleaves. But no single product controls every weed. Scout your fields and add a partner product if needed. Check the label for the weed list.
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