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How to Manage Pests

Pesticide Information

Active ingredient: Cypermethrin

Pesticide type: insecticide (pyrethroid)

See example products below.

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

Acute Toxicity to People and Other Mammals4

  • Toxicity rating: Moderately Toxic

Long-Term Toxicity to People and Other Mammals5

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

Water Quality Rating2

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

Impact on Natural Enemies

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

Impact on Honey Bees3

  • Toxicity category: I - Do not apply to blooming plants

Pests for which it is mentioned in Pest Notes


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

Ace Indoor Fogger 5 • Black Flag Concentrated Fogger • Black Flag Home Invading Ant Spider Killer • Eliminator Indoor Fogger • Enforcer Overnite Pest Control Concentrate • Farnam Tri-Tec 14 Fly Repellent • Hot Shot Fogger 5 with Odor Neutralizer • Hot Shot No-Mess Fogger 3 with Odor Neutralizer • Hot Shot Pest Control Concentrate • Raid Ant & Roach Killer 17 • Raid Concentrated Deep Reach Fogger • Raid Wasp & Hornet Killer 33 • Real-Kill Indoor Fogger 5 • Spectracide Bug Stop Indoor Fogger 5 • Tat Power-Jet Stream With Residual Action


  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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