Cure Leaf Spot Disease. Most contain sulfur or copper octanate. They are usually not needed unless a tree has lost leaves for several years.
Fungicides containing copper and potassium bicarbonate will help contain the fungal disease and keep it from spreading. For houseplants isolate the pot immediately to prevent the fungus from spreading. Once May comes around as the weather can more reliable it is useful to prune back the Photinia a few inches remove the affected leaves and keep the ground beneath clear of leaves this is in the case of Entomosporium which looks similar and occurs under similar circumstances.
If youre wondering if your plant is facing a sad death keep reading to find out all about bacterial leaf spot.
This prevents the spores from spreading to other nearby. Leaf spot diseases will not seriously harm your plants but there are things you can do that when done together can reduce the disease on the tree in following years. Be sure to also test the soil of a tree with leaf spot before fertilizing. Non-chemical control Dispose of affected leaves and any that have already fallen as a result of the disease.
