🚀 go-pugleaf

I am preparing to install permanent minirhizotron tubes (acetate tubes
protruding approx. .5 meter out of the ground) at a site known to have a
healthy bear population.  These tubes must not be moved or disturbed
otherwise many data will be lost.  Other researchers have experienced bear
"vandalism" on their piezometers and other field instruments.

Does anyone have advice on non-cruel methods to ensure bears will stay away
from these tubes?  Exclosures are being considered but are very costly and
logistically problematic.  Thanks in advance for comments/suggestions.