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How to Manage Pests

Pesticide Information

Active ingredient: 2,4-D

Pesticide type: herbicide

Synonyms: 2,4 D; 2,4-D amine; 2,4-D ester; 2,4-DP

See example products below.

Potential Hazard1 to
Water quality2
(aquatic wildlife)
Natural enemies
(beneficials)
Honey bees3 People and Other Mammals
Acute4 Long Term5
L
M
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: Low
  • Source: Pesticide Choice: Best Management Practice for Protecting Surface Water Quality in Agriculture. UC ANR Publication 8161.

Impact on Natural Enemies

  • Overall toxicity rating: No information

Impact on Honey Bees3

  • Toxicity category: No information

Pests for which it is mentioned in Pest Notes

Catchweed BedstrawCommon KnotweedCommon PurslaneCreeping Woodsorrel and Bermuda ButtercupDandelionsField BindweedMallowsPerennial PepperweedPlantainsPoison HemlockPoison OakPuncturevineWeed Management in LawnsWild BlackberriesYellow Starthistle

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

Ace Green Turf Ready-to-Spray Weed & Feed Concentrate • Ace Green Turf Weed & Feed • Ace Green Turf Weed and Feed • Ace Green Turf Winterizer Weed & Feed • Ace Spot Weed Killer 2 • All-In-One Lawn Weed & Crabgrass Killer 1 Concentrate • All-In-One Lawn Weed & Crabgrass Killer 1 Ready-to-Spray • Bayer Advanced All-In-One Lawn Weed & Crabgrass Killer I RTU • Bayer Advanced Season Long Weed Control for Lawns Concentrate • Bayer Advanced Season Long Weed Control for Lawns Ready to Spray • Crab-E-Rad Plus • Crab-E-Rad Plus RTU • Expert Gardener Weed & Feed 28-3-3 • Gordon's Trimec Crabgrass Plus Lawn Weed Killer Concentrate • Liquid Turf Builder with Plus 2 Weed Control • Master Nursery Master Green Weed & Feed • Orchard Est. 1931 Weed & Feed • Orchard Lawn Weed Killer Ready-to-Spray • Ortho Weed B Gon Max • Ortho Weed B Gon Max Plus Crabgrass Control Ready-Spray • Scotts Super Turf Builder Winterguard with Plus 2 Weed Control • Spectracide Weed Stop for Lawns Concentrate • Spectracide Weed Stop for Lawns Plus Crabgrass Killer • Spectracide Weed Stop for Lawns Plus Crabgrass Killer Concentrate • Sta-Green Phosphorous-Free Weed & Feed • Sta-Green Ready-to-Spray Weed & Feed 20-0-0 • Super Turf Builder Weed and Feed • Super Turf Builder With Plus 2 Weed Control • Turf Builder with Plus 2 Weed Control 28-3-3 • Vigoro Ultra Turf Ready-to-Spray Weed & Feed 20-0-0 • Vigoro Weed & Feed • Weed Beater Plus Crabgrass & Broadleaf Weed Killer Ready To Spray • Weed Whacker • Wipe-Out Crabgrass Killer Plus Concentrate


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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