Re; rats in my fig

In NZ, electric power companies often attached a sleeve
of galvanised flat iron around 60-70 cm deep (2 - 2"6") 
tight around older wooden power poles to prevent possums
(extreme pest in this country) from climbing up & causing
havoc by shorting out the lines!!! Not so common now,
as wooden poles are mostly replaced by concrete ones,
but I imagine there are still plenty of back country roads
where they still exist.
 
Might this be a possibility for your fig tree?
Of course, power poles don't increase in girth, as a tree
does, and are also a tad more regular in shape!!!!
 
 
Frances Gibbons,
Wanganui, NZ.
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