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Use ZeroTol 2.0 or OxiDate 2.0 for commercial-grade mold control
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BioSafe Systems makes the two most widely used commercial fungicides for microgreen growers: ZeroTol 2.0 and OxiDate 2.0. Both use hydrogen peroxide combined with peroxyacetic acid to kill mold, bacteria, and algae on contact with zero residue and no pre-harvest interval.
ZeroTol 2.0 (EPA Reg. 70299-12)
- Active ingredients: 27.1% hydrogen peroxide + 2.0% peroxyacetic acid
- OMRI listed for organic production
- Preventative foliar spray: 1:200 to 1:400 dilution (0.32-0.64 fl oz per gallon), applied every 5-10 days
- Curative spray (active mold): 1:100 dilution (1.28 fl oz per gallon), applied every 3-5 days
- Rescue treatment (severe outbreak): 1:40 dilution
- Soil/media drench: 1:1,500 to 1:2,000 dilution, saturate media, repeat every 7-10 days
- Surface sanitizer: 1:100 dilution for pre-cleaned trays and equipment
- Use same day as mixed; do not store diluted solution
- Works best in neutral pH water (7.0) with low organic/inorganic material
OxiDate 2.0 (EPA Reg. 70299-2)
- Active ingredients: Hydrogen peroxide + peroxyacetic acid (different ratio than ZeroTol)
- OMRI listed for organic production
- Preventative foliar spray: 1:200 to 1:400 dilution, applied every 5-10 days
- Curative spray: 1:100 dilution (do not exceed -- stronger dilutions cause leaf necrosis)
- Seed treatment/pre-plant dip: 1:100 dilution (64 fl oz per 50 gallons)
- Controls downy mildew, botrytis, powdery mildew, and bacterial blight
- 0-day pre-harvest interval, 0-hour REI -- safe up to day of harvest
ZeroTol HC (Home & Commercial variant)
- Smaller packaging targeted at smaller growers
- Same active chemistry, available on Amazon
- Apply via spray bottle for small operations
Key Differences
- ZeroTol 2.0 is more commonly used by microgreen growers due to broader labeling
- OxiDate 2.0 has explicit seed treatment labeling that ZeroTol does not
- Both are safe for use on food crops up to harvest day
- Both decompose into water and oxygen, leaving no residue
Tips
- Always use fresh solution -- mixed solutions degrade within hours
- Test on a small section of tender microgreens first, especially at curative rates
- These products kill on contact but have no residual protection -- reapply on schedule
- For microgreens, the preventative rate (1:200-1:400) is sufficient for most situations
- Store concentrate in a cool, dark place away from metal containers
📅 Created: 2/11/2026, 1:24:15 AM 📌 commercial 🔧 ZeroTol 2.0 or OxiDate 2.0, spray bottle or sprayer, measuring tools
Other solutions for How do I prevent and treat mold on microgreens?
- Control airflow, humidity, and temperature to prevent mold environmentally
- Identify mold vs. root hairs and know common mold species
- Sanitize trays and equipment between every growing cycle
- Choose the right growing medium to minimize mold risk
- Use proper seeding density and bottom watering to prevent mold