Fredric Miller, PhD - a senior scientist in entomology at the Morton Arboretum - has put out pest alerts for the elm zigzag sawfly and calico scale. Below are articles for the USFS Pest Alert and control solutions, respectively. 

If you notice either one of the pests, contact Dr. Miller at fmento84@gmail.com.

Elm-Zigzag-Sawfly-Pest-Alert-November-2024-FINAL-508.pdf

Calico-Scale-UKY-Ext.pdf