hawthorne disease

Question

Hawthorne has speckled, discolored and sparse leaves.

Answer 1

This likely is a fungus issue.
You can treat with Neem Oil, as this acts as both an insecticide and fungicide.

Here is a link to refresh you on care requirements.

https://www.gardeningknowhow.com/ornamental/trees/hawthorn/growing-hawthorn-trees.htm
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm