> It's damn near impossible to kill bees with CO2.
Only when one is stingy with the CO2.
One needs a largish fire extinguisher. -40 to -60 F kills insects quickly, but this is a close-range effect, of course. Something bigger than the typical kitchen-sized extinguisher one would find in a home kitchen. Think the 20Kg "wheeled unit" size that comes on its own handtruck, kept in in airplane hangers and near warehouse truck bays.
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