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How to Manage Pests

Pesticide Information

Active ingredient: Sulfur

Pesticide type: fungicide

See example products below.

Potential Hazard1 to
Water quality2
(aquatic wildlife)
Natural enemies
(beneficials)
Honey bees3 People and Other Mammals
Acute4 Long Term5
L
LH
L
VL
Not listed

Acute Toxicity to People and Other Mammals4

  • Toxicity rating: Not Acutely Toxic

Long-Term Toxicity to People and Other Mammals5

  • On US EPA list: Not listed;
  • On CA Proposition 65 list: Not listed

Water Quality Rating2

  • Absorbed runoff toxicity risk to fish rating: Low
  • Solution runoff toxicity risk to fish rating: Low
  • Source: UC IPM WaterTox Database (originally NRCS Pesticide Properties Database)

Impact on Natural Enemies

  • Overall toxicity rating: Low To High
  • Specific impacts: predatory mites (Low To High), parasitoids (High), general predators (Low To Moderate)

Impact on Honey Bees3

  • Toxicity category: IV - Apply at any time with reasonable safety to bees

Pests for which it is mentioned in Pest Notes

Apple and Pear ScabPowdery Mildew on Fruits and BerriesPowdery Mildew on OrnamentalsPowdery Mildew on VegetablesRoses in the Garden and Landscape: Diseases and Abiotic Disorderspowdery mildewSpider Mites

Application Tips

As a fungicide, sulfur protects only healthy plant tissues and must be applied before the fungi arrive and begin the infection process. Water-soluble, sprayable sulfur formulations are easiest to apply. Some excellent garden products are formulated with soap. Sulfur can also be applied as a dust, but this can irritate 90 for some crops. Dust formulations are most effective against mites.

Precautions and Safety Equipment

Minimize your exposure to pesticides.  Avoid contact with eyes.  Wear eye protection, long pants, a long-sleeved shirt, and a hat that can be washed after each use.  Always read label of individual product for additional directions.

Always check the label before purchasing or applying a pesticide product for a specific pest on a specific plant to be sure it can be applied. Follow label directions precisely.

WARNING ON THE USE OF CHEMICALS


Example home, garden or landscape use products6

Amdro Gopher Gasser • Bayer Advanced Natria Fruit & Vegetable RTU • Bayer Advanced Natria Insect, Disease & Mite Control Ready-to-Use • Bayer Advanced Natria Rose & Flower RTU • Bonide Sulfur Plant Fungicide • Bonide Tomato & Vegetable Concentrate • Citrus, Fruit & Nut Orchard Spray Ready to Spray • Earth-Tone 3n1 Disease Control • Earth-Tone 3n1 Disease Control Concentrate • Garden Fungicide for Flowers, Fruit & Vegetables • Lilly Miller Sulfur Dust • Revenge Rodent Smoke bomb • Tomato & Vegetable Ready to Use • Tomato & Vegetable RTS • Whitney Farms 3-in-1 Rose & Flower Care


Footnotes

  1. Potential Hazard Rating: VL=Very low, L=Low, LM=Low to Moderate, M=Moderate, LH=Low to High, MH=Moderate to High, H=High, VH=Very High, N=None, NKR=No Known Risk, —=No data
  2. Water quality ratings from Pesticide Choice: Best Management Practice (BMP) for Protecting Surface Water Quality in Agriculture, ANR Publication 8161, or the USDA-NRCS WIN-PST database—see Pesticides: Water-Related Toxicology of Active Ingredients.
  3. Honey bee ratings are: (Very High) I-Do not apply to blooming plants; (High) II-Apply only during late evening; (Moderate) III-Apply only during late evening, night, or early morning; and (Low) IV-Apply at any time with reasonable safety to bees. For more information, see How to Reduce Bee Poisoning From Pesticides (PDF), Pacific Northwest Extension Publication PNW591.
  4. Acute oral toxicity ratings for people and other mammals based on LD50 and US EPA Acute Toxicity Ratings system: H = Highly Toxic (LD50 <50), M = Moderately Toxic (LD50: 50-500), L = Slightly Toxic (LD50: 500-5000), VL = Not Acutely Toxic (LD50 >5000)
  5. Long term ratings indicate whether the active ingredient is on the California Prop 65 list, which indicates if materials are known to cause cancer or reproductive toxicity, or whether the US EPA has classified the pesticide as "likely to be carcinogenic to humans", "Group B-Probably Human Carcinogen", or "Group C-Possible Human Carcinogen."
  6. These products were registered for home and garden use in California in July 2013. Professional use products are not included. If no example products are listed, this active ingredient may be available only for professional use. Individual products are registered for specific uses on specific sites. Read the label to determine if the product is registered for your use. Note that some products may be formulated with additional pesticides.

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Statewide IPM Program, Agriculture and Natural Resources, University of California
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