Can honey bees pick up pyrethroids left on leaves from mosquito sprays?
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  1. #1

    Default Can honey bees pick up pyrethroids left on leaves from mosquito sprays?

    I've been trying to find evidence that honey bees can pick up pyrethroids that might be dried onto leaf surfaces. Information is needed for a blog post I'm working on about mosquito-control companies (I'm not a fan). I'm wondering whether the pyrethroids might get onto bees in the early part of day when plants are covered with dew and when plant guttation is making leaf surfaces wet (i.e., the chemicals are in solution, not dried). Thanks for any help.

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  3. #2
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    Default Re: Can honey bees pick up pyrethroids left on leaves from mosquito sprays?

    Quote Originally Posted by colinpurrington View Post
    i.e., the chemicals are in solution, not dried
    if the chemicals are in solution and not dried absolutely the bees can pick them up, if they are dried, less likely, and pyrethroids are sensitive to light and breakdown somewhat although the synthetic pyrethroids will kill for 4 days.
    mike syracuse ny
    Whatever you subsidize you get more of. Ronald Reagan

  4. #3

    Default Re: Can honey bees pick up pyrethroids left on leaves from mosquito sprays?

    Thank you, Mike. So *dried* pyrethroids on a leaf surface will kill honey bees for 4 days? Or is that 4 days for everything? Also, any chance you could point me to a research article for that? I'm trying to find a reference so that I can back up my belief that mosquito sprays are harmful to honey bees even days later. It's for https://colinpurrington.com/2018/09/...squito-sprays/.

    Quote Originally Posted by wildbranch2007 View Post
    ...synthetic pyrethroids will kill for 4 days.

  5. #4
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    Default Re: Can honey bees pick up pyrethroids left on leaves from mosquito sprays?

    can't remember where I found it, but they were spraying north of here and they guy with bee hives was in florida, I looked up the pesticide they were spraying which was a synthetic pyrethroid and it said 4 days. The info is in FB, so I might not be able to find it again. will try
    mike syracuse ny
    Whatever you subsidize you get more of. Ronald Reagan

  6. #5
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    Default Re: Can honey bees pick up pyrethroids left on leaves from mosquito sprays?

    can't find the exact same information but in our area they sprayed Kontrol 30-30
    from my email to the person in the spray area from the information I found at I think it was Cornell or the state of NY

    Kontrol 30-30 is pyrethiom it kills bees, the pbo has a half life of 8 hrs. synthetic pyrethium has a half life of 4 days, but if I remember correctly once it dries is less likely to affect the bees.

    so after drying it's less likely to kill bees, so if they sprayed at night as they did here you would expect few dead bees, from the person that was in the spray area.

    Over last couple of days I have assessed the damage from the XXXXXX mosquito spraying.
    I left for vacation with 28 hives all stuffing and producing well. I came back to find a total of 7 full hive loses and 4 more in very bad condition. None have produced a drop off honey and some have less than a couple weeks ago.
    mike syracuse ny
    Whatever you subsidize you get more of. Ronald Reagan

  7. #6

    Default Re: Can honey bees pick up pyrethroids left on leaves from mosquito sprays?

    Thanks, Mike. Sorry to hear about your hives. Terrible. What was the spray?

  8. #7
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    Default Re: Can honey bees pick up pyrethroids left on leaves from mosquito sprays?

    Quote Originally Posted by colinpurrington View Post
    Thanks, Mike. Sorry to hear about your hives. Terrible. What was the spray?
    not my hives, I'm not in the spray area, a person in the bee club.
    mike syracuse ny
    Whatever you subsidize you get more of. Ronald Reagan

  9. #8
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    Default Re: Can honey bees pick up pyrethroids left on leaves from mosquito sprays?

    Apistan is a synthetic pyrethroid, and beeks put it inside the hive. Does it kill all the bees?

    Not much light in there, and like many labels there is bee language "ENVIRONMENTAL HAZARDS
    This product is toxic to honey bees if bees are exposed to direct application. However, dried
    residues of this product are non-toxic to honey bees . Treat during non-foraging periods to
    minimize adverse effects."

    Label here: https://www.centralapiary.com/

    Dosage is important to consider. Also this is a residual treatment, 6 weeks.

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