When conducting pesticide contact toxicity tests, its common to use C02 to
put bees to sleep - just not too much, or its permanent.
Best I can tell, C02 has little/no longer term effects of the bees. Some
testing firms use Nitrous oxide to put bees asleep. I don't like it,
published papers indicate that it affects bee memory.
Don't know if anyone has tested ammonium nitrate for sublethal effects.
Jerry
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