9ac1836f_Pests___Diseases__Problem_Symptom
[Cause] Spot anthracnose, a fungus disease. The fungus spreads in water. This disease is somewhat similar to blackspot in appearance but appears in cool early spring weather, where blackspot needs warmer, late spring weather. [Solution] Regular preventative fungicide applications for blackspot will be the best you can do for anthracnose. Do not water plants from above, since the fungus spreads in splashing water. [Problem/Symptom] 
Small red, brown or purple spots develop on upper leaf surfaces. The center of each spot eventually dries out, turns white and may fall out of the leaf. Leaves eventually turn yellow and fall from the plant.
Pests & Diseases
Problem/Symptom