the crape myrtle looks like something was sprayed on it and the liquid ran to the leaf tips, sat there, and then the sun caused a burn. I wouldn't worry about the crape myrtle. I would recommend either doing a soil drench or foliar spray of systemic insecticide to treat the crape myrtle scale. Bio advanced has a good shrub/tree systemic insecticide. Crape myrtles biggest issues are crape myrtle scale, spittle bugs, powdery mildew, sooty mold. Here in DFW if we have a early hard freeze or just a hard winter, some varieties will have severe die back.
https://hgic.clemson.edu/factsheet/crape-myrtle-diseases-insect-pests/Re: rose pic, I assume you're talking about the 1 leaf spot on the leaf? That is just rose leaf spot and can be treated with a systemic fungicide. Leaf spot is more prevalent during wet, humid conditions. I don't know where you're located but keep an eye out for rose rosette virus. Here in DFW rosette virus has devastated roses.
https://neilsperry.com/notes/2018/04/rose-rosette-virus/