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In NZ they wrap a band of galvanised steel around tree trunks, power poles etc. Seems to work. Needs to be about 600mm wide at least so critter can't reach across.
If you run out of possums we have millions of the little pests. Over here shooting, poison, death by ray guns, automobile aiming is encouraged. You can have them all back anytime you want. Destructive little gits. Used to be a bounty on the tails at one stage. Get the 22 and strap a decent torch on and head for the orchards. I could bag 20-30 a night. Good pocket money.
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