Azalea lace bug is an insect that sucks out plant juices through their mouthparts.
From the delawareonline.com
Several are plant pests, such as lace bug, chinch bug and squash bug.
From the washingtonpost.com
The storm damage is fixed, the accumulated leaf litter of fall is removed before it does harm, and there is little evidence of lace bug damage.
From the washingtonpost.com
If you've noticed that your azaleas have stippled leaves with black spots on the undersides and are not thriving well, you might have an azalea lace bug infestation.