Deer and Carbon Dioxide
I read somewhere recently (maybe here I can't remember) about a mosquito control tip.
Buy 1 pound of dry ice and place it in the corner of your yard to keep the mosquitoes away from you while you're outside. The dry ice is all carbon dioxide and is supposed to last in summer heat up to 4 hours. The mosquitoes are drawn to CO2, especially high levels - that is how they find hosts (or camo'd guys in trees.)
So I'm wondering, how would a deer react to a small block of dry ice? Humans cannot detect the odor of CO2, but if a mosquito can, could a deer??? Might be worth a try this October. 1lb of dry ice runs about $10.