What is causing my Indian Hawthorn to have a lot of reddish and brown spots on their leaves? They seem to be getting thinner too.

Unfortunately Indian Hawthorn are susceptible to Entomosphorium Leaf Spot disease. Rake away fallen leaves and spray the new growth with a protectant fungicide every 7 to 10 days until the leaves mature. We like to use Ortho Rose Pride (formerly called Funginex )because it is colorless.