If You See Trees Painted White, This is What it Means? – Here’s the real Reason!

2Why Are Trees in the City Marked With Paint?
All cities have codes for marking trees. Here we’ll use Boulder, Colorado, as an example. In Boulder, when you see a dot at the base of the tree, that signifies it needs treatment for emerald ash borer, elm scale or drippy blight. Paint dots at head height mean the tree needs pruning.