⚖️ Educational use only. Always read and follow the full product label — the label is the law under FIFRA. Full disclaimer → | ⚗️ Mixing Calculator →
🏷️ Brand Names — Same Active Ingredient
Bonide Sulfur Plant Fungicide — consumer dust/WP
Safer Brand Garden Fungicide — consumer spray
Kumulus DF — BASF — professional WDG
Microthiol Disperss — Certis — professional WDG
🎯 What It Kills
✓ Powdery Mildew✓ Rust✓ Brown Rot✓ Scab✓ Spider Mites (supplemental)
⚙️ How It Works
Elemental sulfur is one of the oldest pesticides — both fungicide and mild miticide. Works by interfering with electron transport in fungal cells. OMRI-listed. Particularly effective against powdery mildew when applied preventively.
⚗️ Mixing & Application
Sulfur WP: 3 tablespoons per gallon for garden use. Dust applied directly to foliage. Preventive — stops new infections. Incompatible with oil sprays — allow 2 weeks between applications.
Example
0.5 oz
per gallon
⚗️ Mixing Calculator
Enter your sprayer size and target rate — get the exact amount to pour. Backpack, hand sprayer, hose-end, or skid unit.
⚠️ Safety
- ⚠ NEVER apply above 90°F — severe phytotoxicity
- ⚠ Do not apply within 2 weeks of oil-based sprays
- ⚠ Dust formulation requires respirator
- ⚠ Corrosive to some metals — flush sprayer thoroughly
🐛 Pests This Treats — Learn More
Click any pest to view its full identification guide, biology, and treatment options.
⏱️ Residual & Re-entry Timeline
🔹
Apply
Follow label mixing and application rates
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Re-entry: 2–4 hours (until dry)
Keep people and pets out of treated area
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Effective period: 7 days
Active residual — killing or repelling target pests
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Reapply
Re-treat when pest activity returns or residual expires
🌿 Environmental & Ecological Impact
❓ Frequently Asked Questions
Q: Is sulfur fungicide safe for pets?
Follow the product label. Keep pets out of treated areas until completely dried (2–4 hours for sprays). Once dry, treated surfaces pose minimal risk to dogs and cats.
Q: Can I use sulfur fungicide indoors?
Check the specific product label — formulations vary. Baits and dusts often have indoor labeling; concentrates and granulars are typically outdoor.
Q: How long does sulfur fungicide last after application?
Residual varies by formulation, surface type, weather, and UV exposure. Indoor applications last longer than outdoor. Check the product label for re-application intervals.
Q: What should I do if exposed?
Remove contaminated clothing, wash skin with soap and water. For eye contact, rinse 15–20 minutes. For ingestion or severe symptoms, call Poison Control (1-800-222-1222). Have the product label available.
📋 Safety Data Sheet (SDS)
Bonide Sulfur Plant Fungicide — Safety Data Sheet
View the official SDS document for this product directly on the CDMS label database.
📚 Sources: EPA Pesticide Labels · NPIC Pesticide Info
Published: Jan 1, 2025 · Updated: Apr 7, 2026
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Reviewed by Derek GiordanoContent reviewed by a licensed pest management professional and cross-referenced against EPA, university extension, and manufacturer technical data. Last reviewed: April 2026.