Swamp Maire aerial roots

We have some outstanding specimens of swamp maire (Syzygium maire) that have been planted in our gully. The oldest would be about twenty years old. The one thing unique about these are their aerial roots which have evolved to handle the wet conditions they can grow in – see the photo. One tree growing close to the main track has looked poorly for a number of years. This track has had frequent weed spraying to keep it clear, so it is highly probable that spray has got onto the aerial roots and, with repeated spraying over time, is gradually killing the tree. Something anyone doing weed spraying should be aware of around the base of a swamp maire.