Mould on maple tree and maple shoots

I have a 52 year old maple at the south side of the house in full sun- the tree is healthy looking, however, what I believe to be moss is growing on all sides of the trunk and the roots…

Zinnias and Powdery Mildew

The zinnias I planted were doing very well but have developed some white dusty leaves and aren’t looking as healthy. What am I doing wrong? Over-watering? Is this mould?…