I have black edges on some of my shrubs, like it has been burned. Any idea of what this might be? I also have some white netting material over a plant — could this be spider mites? On my Indian Hawthorne, some of the leaves have brown spots and the leaves are turning red — any idea of what this is?
Without seeing the blackening on your shrubs, we cannot determine what you might be seeing. The white netting could likely be spider mites and should be treated with a product labeled for your plant. The spots on your Indian Hawthorn might be the contagious Leaf Spot that we see on them, so as long as it isn't widespread on your plants you could protect it from further damage by spraying with a fungicide labeled for Indian Hawthorn.