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How to Manage Pests

Pesticide Information

Active ingredient: Carbaryl

Pesticide type: insecticide (carbamate)

Synonym: sevin

See example products below.

Potential Hazard1 to
Water quality2
(aquatic wildlife)
Natural enemies
Honey bees3 People and Other Mammals
Acute4 Long Term5
CA Prop 65

Acute Toxicity to People and Other Mammals4

  • Toxicity rating: Moderately Toxic

Long-Term Toxicity to People and Other Mammals5

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

Water Quality Rating2

  • Overall runoff risk rating: Moderate
  • Source: Pesticide Choice: Best Management Practice for Protecting Surface Water Quality in Agriculture. UC ANR Publication 8161.

Impact on Natural Enemies

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

Impact on Honey Bees3

  • Toxicity category: I - Do not apply to blooming plants
  • Notes: carbaryl baits less toxic to bees than sprays.

Pests for which it is mentioned in Pest Notes

Asian Citrus PsyllidBark BeetlesBiological Control and Natural EnemiesCarpenterwormCodling MothEarwigsElm Leaf BeetleGoldspotted oak borerGrasshoppersHoplia BeetleLawn insectsRoses in the Garden and Landscape: Insect and Mite Pests and Beneficialsspider mitesSnails and Slugs

Application Tips

Foliar sprays with emulsifiable concentrate (EC) formulation:
Pests are killed by consumption, so good coverage of consumed surfaces is required. Compressed air or backpack sprayers are desirable for good coverage on trees; other sprayers are acceptable on smaller plants.

Squash bugs:
Apply dusts or sprays especially to the base of plants when eggs are laid and bugs aggregate. Repeat application about 2 weeks later. Do not apply to blossoms.

Trunk sprays:
Purchase a product labeled for bark treatments and apply at the rate recommended for trunk treatments. Carbaryl applied at foliar rates will not control borers. Timing is critical. For elm leaf beetle, sprays must kill mature larvae as they crawl down the trunk. For borers, sprays must kill adults before they lay eggs and be applied to cover the trunk, crotches, and lower limbs. Keep carbaryl off foliage as much as possible to prevent killing natural enemies and inducing mite problems. Keep sprinklers directed away from the trunk to avoid washing off the spray.

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.


Example home, garden or landscape use products6

GardenTech Sevin Concentrate Bug Killer • GardenTech Sevin Lawn Insect Granules • Gardentech Sevin Ready-To-Use • GardenTech Sevin RTS Bug Killer • Gardentech Sevin-5 Ready-To-Use 5% Dust


  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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