I puzzled over making the soil under feeders safer for a bit after
fantasizing about irradiated bird feed, and decided heat of some kind
might be best. Aside from a possible dangerous use of fire, say a
torch of some kind or application of an accelerant and ignition, I
guess boiling water or application of steam might do it. I guess we'd
want to steer away chemicals.
One might apply plastic or a mulch under feeders and remove it once in
a while.
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