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Houston,TX photina (red tip)

Hi Everyone, 
some help needed to manage what seems to be a fungal infection of my plants. The first two images are from the first  photinia  plant next to garage which show broken and burned and damaged leaves. The last image is from another plant on the side of the building where there is more shade. This one shows spots on the leaves. What antifungal can I use?. And what interval to prune? I was thinking to collect all the affected leaves so it doesnt spread but Im not sure. Any help is appreciated. 
Note; The first plant is near the area where pest control company uses pesticide sprays for spiders once every 4 months. Could this have anything to do with it? 
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