my plum tree flowered fruit started but have now gone

Question

The tree started to form fruit but no fruit. Now some mould on tree.

Answer 1

Can you include a photo? I have a feeling that a fungal infection may have had something to do with the fruit dropping off. A photo can help me to make a better judgment call.

This article will give you some information in the meantime: https://www.gardeningknowhow.com/edible/fruits/plum/plum-tree-diseases.htm