Re: Mosquito spraying experiences
We have an intensive mosquito abatement (MA) program locally. They used to use pyrethrum, which is the chrysanthemum derivitive, but have now switched to a synthetic version--a pyrethroid--which is the same active ingredient in Anvil.
The sprayers come by our house 2-3 times per week during summer on evenings when there is little or no wind. They spray approx. 80 yards away from my hive. Pyrethroids are fatal to bees, but I have never seen any direct consequences on my hive. For one, they spray at dusk or later, when mosquitos are out full force and bees are tucked in for the night. Secondly, it's possible the chemical does not reach the hive, or is too dilute by the time it travels the distance. the chem is often mixed in a water/oil carrier, so I assume it's heavy enough to fall to the ground rather quickly.
I checked the hive every morning after the evening spraying for the first two weeks of this year's MA, and never noticed dead bees or a sickly hive. They are robust as ever and seem to have escaped the insecticide's effects (as have many mosquitos).
I live across the street from a lake in Utah at 6500' elevation in a high mountain desert climate. Any other info or questions, feel free to PM me.
Hope this helps,
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