THORNLIE tree man Richard Pennicuik was convicted of obstruction when he appeared in Armadale Magistrates Court today.
Mr Pennicuik was fined $500 and ordered to pay $5000 in costs to the City of Gosnells.
But the long-running dispute may not yet be over.
Outside court, key supporter James Dean said Mr Pennicuik would appeal the decision.
Mr Pennicuik was charged with obstruction after he failed to come down from a tree on the verge outside his home that was earmarked for lopping by City of Gosnells contractors.
He gained world-wide attention when his protest lasted more than 100 days.