HomeCyazofamid vs Cymoxanil: How They Compare for Downy Mildew
Cyazofamid vs Cymoxanil: How They Compare for Downy Mildew
Two actives with different strengths. Cyazofamid is a protectant, cymoxanil is a curative. Here's what that means for your fungicide program.
What Each Active Does
Cyazofamid belongs to the cyanoimidazole chemical class. It works mainly as a protectant, stopping spore germination and early infection. You'll see it used against oomycete diseases like downy mildew and late blight on vegetables, grapes, and potatoes.
Cymoxanil is a cyanoacetamide oxime. It's a local systemic with curative and antisporulant activity. It penetrates leaves quickly and can stop early infections. It's often mixed with protectants to add kickback activity.
Side by Side Comparison
| Aspect | Cyazofamid | Cymoxanil |
|---|---|---|
| Chemical class | Cyanoimidazole | Cyanoacetamide oxime |
| Mode of action | Inhibits complex III in fungal respiration | Inhibits nucleic acid synthesis |
| Main targets | Oomycetes: downy mildew, late blight | Oomycetes: downy mildew, late blight |
| Systemic or contact | Contact and protectant | Local systemic, curative |
| Typical formulation | SC, WG | WP, WG, often in mixtures |
| Resistance management role | Use in rotation with other FRAC groups | Low risk alone, but usually mixed |
| Tank-mix notes | Compatible with many protectants | Often paired with protectants like mancozeb or famoxadone |
Choosing Between Them and CHICO Products
Pick cyazofamid when you need strong preventive control and want a different FRAC group in your rotation. Pick cymoxanil when you need curative action or a short pre-harvest interval. In practice, many growers use both.
CHICO offers a ready cyazofamid cymoxanil mixture: CYMA® Cyazofamid 10% + Cymoxanil 50% 60% WDG. It combines protectant and curative activity for cucumber, potato, grape, and other crops. For a cymoxanil-based option without cyazofamid, see CYFA® Cymoxanil 30% + Famoxadone 22.5% 52.5% WDG. Check the label of your registered product for local use rates.
Questions Buyers Ask
Can I tank-mix cyazofamid and cymoxanil?
Yes, they're often mixed. Cyazofamid gives protectant control, cymoxanil adds curative action. CHICO's CYMA® 60% WDG is a ready formulation, so you don't need to mix them yourself.
Which one is better for resistance management?
Both have a place. Cyazofamid is a FRAC group 21 fungicide, so rotate it with other groups. Cymoxanil is usually mixed with a protectant, which helps delay resistance. Using a pre-mix like CYMA® can simplify your program.
Does CHICO sell cyazofamid alone?
No, CHICO doesn't offer a single-active cyazofamid product. The CYMA® 60% WDG contains cyazofamid 10% plus cymoxanil 50%, which covers both protectant and curative needs in one granule.
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