Regarding defense:
we saw somewhere - Spray Listerine and it is as good as any keep off me stuff.
My wife bought a pair of bottles at Sams - one for the shop and house.
I sprayed with a small hand sprayer - the door sides and entrances.
Three roll-up and and door. Fourth roll-up stays down.
All week I was using deep woods... It worked once remembered...
After applying - no smell to me - but no bugs either - even after dusk and the lights on inside and out.
So just maybe it really works.
Mart> I want to build a large bug zapper similar to the tenis racket shaped