Entomosporium%20Leaf%20Spot (Entomosporium%20spp) - Affecting%20mostly%20hawthorn%20and%20red-tipped%20photinias%2C%20this%20fungus%20is%20notorious%20for%20causing%20widespread%20damage%20to%20ornamental%20members%20of%20the%20Rosaceae%20family.%20The%20disease%20is%20most%20damaging%20following%20periods%20of%20frequent%20rainfall%20in%20the%20spring%20and%20warmer%20temperatures%20in%20the%20fall.%20The%20most%20common%20symptoms%20are%20tiny%2C%20circular%20red%20spots%20that%20appear%20on%20the%20leaves.