Q.Crape Myrtle Tree Leaves Turning Yellow With Brown Spots
What can we do to help our tree? Also, we have a bird nest in this tree and don’t want to harm them. Thanks!

Certified GKH Gardening Expert
Without a photo I can't be certain, but it could be Cercospora leaf spot, which is a fungal infection. Another possibility is spider mites.
Here is info on both that should help:
https://hgic.clemson.edu/factsheet/crape-myrtle-diseases-insect-pests/
https://www.gardeningknowhow.com/plant-problems/pests/insects/spider-mite-treatment.htm
https://www.gardeningknowhow.com/ornamental/trees/crepe-myrtle/crepe-myrtle-pest-control.htm