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UC IPM Home > Home,
Gardens, Landscapes, and Turf > Pesticides > Sulfur
How to Manage Pests
Pesticide Information
Sulfur
Type
Inorganic fungicide and miticide.
Plant uses
Ornamentals, fruit trees, vegetables; some plants can be injured such as some varieties of cucurbits
and spinach. Apricots, Concord grapes, and nut trees are also sensitive to sulfur and can burn. Check labels for
recommended crops.
Pests controlled
Powdery mildew, rust, brown rot, and a few other diseases caused by fungi. Also spider mites
and eriophyid, rust, or russet mites.
 Hazards to people
Low oral toxicity but highly irritating to skin
and eyes.
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 Hazards to wildlife
Low
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Hazards to beneficials
Low
to moderate.
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Potential period of activity after treatment
Protectant fungicide; apply before infection.
Precautions and safety equipment
Do not apply in combination with oil. Do not apply oil if sulfur has been applied within the previous
30 days. Unless otherwise stated on the label, wear rubber or neoprene gloves, eye protection that covers the brows
and temples, and long pants, a long-sleeved shirt, and a hat that is washed after each use.
Active ingredient
Sulfur.
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
skin and eyes and may be harmful if inhaled, so follow all safety use directions. At very low temperatures, sulfur
may not be effective. Do not apply wettable sulfur when temperatures are over 90° F or after heavy dew or fog. Sulfur
dust can be applied above 90° F for some crops. Dust formulations are most effective against mites.
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
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