Report a Pesticide-Related Bee Kill

Bees are vulnerable to acute pesticide poisonings from direct sprays, spray drift, contact with treated surfaces, and ingestion of contaminated pollen, nectar, or water. Insecticides are usually the cause.

Symptoms of acute pesticide poisoning in bees

  • Dead and dying bees on the ground outside the hive
  • Dead bees with proboscis extended
  • Nearly dead bees twitching or spinning in circles
  • Rapid substantial drops in hive population, including loss of the entire hive

Watch video of poisoned bees

Preventing pesticide-related bee kills

The best way for pesticide users to prevent bee kills and protect native pollinators is to avoid using pesticides toxic to bees on blooming crops or near hive locations. However, acute bee kills can be minimized even where pesticides are applied by using less-toxic products, accounting for bee habits and hive locations, and timing applications appropriately. In particular, applicators can reduce risks if they do the following:

  • Avoid insecticide applications to blooming crops that are attractive to bees.
  • Avoid all use of systemic insecticides that are toxic to bees. These pesticides persist in the plant for a long time after application (months to years), so avoiding application only during bloom will not protect bees.
  • Select lower toxicity chemicals or chemicals having a short residual time.
  • Know the locations of nearby hives and avoid applications during windy conditions or when winds are blowing from the treated area towards beehives
  • For short residual time pesticides, time applications to occur in the evening or at night to avoid killing or contaminating foraging bees.

Oregon State University has an excellent publication entitled How to Reduce Bee Poisoning from Pesticides that PRI recommends for more information.

The Pesticide Environmental Stewardship Program as part of the Center for Integrated Pest Management has guidelines on Protecting Pollinators.

How to Report a Bee Kill

If you notice symptoms of pesticide poisoning, it is important that you collect as much information as possible about the kill. The Pollinator Stewardship Council (PSC, an organization of beekeepers) is helping beekeepers report poisoning incidents and can guide you through the process and help you get a report in to the EPA so the incident is tracked. Find additional information on reporting a bee kill incident here. For optimum regulatory response, it is important to do the following:

  1. Observe and record the incident: Take photos or videos of your hives and any dead bees, and gather any notes you have made about the prior health and history of the affected hives. Determine the prevailing wind direction at the time of the kill and make a note of any pesticide applications you are aware of that may be related to the bee kill. Find out as you can about location, applicator, and pesticide(s) used. Remember that planting treated seeds can release dust that is highly toxic to bees.
  2. Request an investigation: Request a bee kill investigation from the State Lead Agency for pesticide enforcement in your state. In most states, this is usually the Department of Agriculture or Department of Environmental Protection. While US EPA does not investigate pesticide misuse incidents, you may contact the Regional US EPA office in your area to inform them of the incident, and that you have requested an investigation from your State Lead Agency. An investigation should include an inspection of the site and interviews with people familiar with the bees and the site, sampling of bees and/or potentially contaminated vegetation to test for pesticide residues, and inquiries into where the pesticide contamination may have originated. Some beekeeper organizations have regionally specific instructions for requesting an investigation and local knowledge about agency response. See our list of Beekeeping Organizations for those in your state.
  3. Submit an incident report: PSC can help you with this, but if you choose to submit an incident report yourself, be sure to report the bee kill incident with the National Pesticide Information Center (NPIC) to ensure that there is accurate information on the number of bee kills nationwide. Commercial beekeepers should use the Ecological Pesticide Incident Portal available on the NPIC web site. For the general public, NPIC prefers calls to  1-800-858-7378. NPIC is open from 7:30am – 3:30pm PST. You should also send an email with a brief summary of the incident to US EPA Headquarters in Washington, DC.
  4. Notify the pesticide manufacturer: If you know the pesticide associated with your bee kill incident, report the incident to the pesticide manufacturer as well. Manufacturers are required by law to submit reports of adverse effects to the US EPA. If you know the pesticide that was applied, you can find contact information for the manufacturer by searching for the specific product at the Pesticide Action Network PesticideInfo web site.

The process of reporting a bee kill resulting from pesticide poisoning is not straightforward. PSC can help with the logistics of reporting. PRI is part of US EPA’s Pollinator Protection Workgroup that is providing advice to US EPA to improve the system. If you have comments or suggestions, let us know by putting a comment in the box below and we’ll make sure your concerns are highlighted in the discussions with US EPA. Unfortunately, EPA seems particularly unresponsive to feedback on this issue, but if they don’t hear anything from beekeepers when poisoning incidents occur, they think everything is fine, so it is important to report all pesticide-related bee kills.


  1. siiri2
    July 28, 2014 at 1:52 PM · Reply

    I saw a single wild bee on the ground, running in circles, by an ant hill. I nudged a piece of paper under it; it didn’t flee, just kept spinning until it fell off. then resumed spinning. There did not appear to be ants on it. I have no idea where the nest is or if any pesticides have been used near there, though I doubt it because this was by a weedy parking lot. It was the Great Falls lot in Auburn Maine. I have no images.

  2. flowerbuddy
    June 22, 2015 at 5:08 PM · Reply had too many wild bees these past several weeks dying on our property.
    it’s sad . we are totally organic here on a small 7 acre farm surrounded by grass seed farmers who use nothing but pesticides and chemicals.
    I don’t know who to call, or what to do about this. the bees spin in circles, or seem lost and confused.
    some have deformed wings. there are too many of them affected. what can be done about this terrible problem? tell me please.

    • Siiri Cressey
      June 25, 2015 at 10:46 AM · Reply

      “the bees spin in circles, or seem lost and confused.”
      Yup, that sounds like pesticides. There’s contact information on how to report that on this site.

  3. Siiri Cressey
    June 25, 2015 at 10:53 AM · Reply

    There are also pesticides (neonictinoids) which are put in the soil. If you get potted plants and transplant them outside, find out if the nursery uses these first. For instance (and this is not an advertisement, just education), Burpee does not. Lowe’s does, but they are apparently phasing it out.

  4. Rocky Pettengill
    April 20, 2016 at 3:27 PM · Reply

    I’m in truck driving school, in Oceanside Ca. Yesterday there were bees swarming around the trailer that is used for our classroom, I thought it might be a safety problem so I said something to my instructor. He, in turn, told the on-site program manager. We were given instructions to either go back into the classroom and close the doors and windows or take our studies outside away from the bee swarms. I chose to go inside. The program manager then proceeded to don protective clothing and took some kind of chemical or chemicals that he had in the trailer on-site, and then applied these materials to and at the swarming bees, and trailer. While this was taking place, I reported to another person, my concern of a safety issue. Not being from southern California, I couldn’t tell the difference between a honey bee swarm or an african, killer bee swarm. ( next day)…This afternoon, as the bees were swarming again, the program manager suited up again, and armed with a pump bottle of chemical spray, proceeded to attempt a more thorough job of dispersing, and killing the swarming bees. Because of me reporting this to another person the prior day, somebody that is not affiliated with the school. I was told that if I continued to think of this incident as a safety hazard, I would be removed from the school, and possibly not be allowed to complete my training. Well, I’ve worked too hard to get this far personally to take that path. I’m a homeless veteran, struggling to get my life back together, and want nothing more than to spend the last year’s of my life as a truck driver, seeing this wonderful country again. I did some reading on bees last night, and feel what has happened here, if not illegal, certainly wrong. And, I don’t know what should be done now, or how to proceed, without threat of losing everything I’m achieving. Thank you.

Leave a Reply

Your email address will not be published. Required fields are marked *