I had a lot of those 'scars' where the cicadas laid their eggs. Lots of the leaves where the branches were scarred turned brown. What I did was cut them off before the eggs hatch and the larvae fall down to the soil underneath them. I just cut most of them off and put the branches in the garden waste bin. I doubt that I will experienced the next time Cicada X's coming to visit, but those brown branches look ugly, and the branches that I have pruned the dead leaves are sprouting new leaves and look a lot better although the plants are now about 1/2 the size before the previous prunings. When the larvae fall into the soil, they would search for food and eat the roots. So maybe it is a good idea to change the soil since the cicada eggs hatch between 6-8 weeks after they were laid. I am no expert in citrus trees, so I do not know how to change the soil of a potted citrus plant without killing it. I had success with the pruning those egg branches from roses, viburnums and young dogwood trees.
