Plant Health Care Report issue 2017-2

April 25, 2017

The scouting report of The Morton Arboretum for April 21, 2017.

PDF iconPlant_Health_Care_Report_2017_2 (PDF)


Bartlett Tree Experts, Presenting Sponsor of the Plant Clinic.

Quick View


What indicator plant is in bloom at the Arboretum? Eastern redbud is in early flower (Cercis canadensis)
Accumulated Growing Degree Days (Base 50): 121.5 (as of April 20)
Accumulated Growing Degree Days (Base 30): 1032 (as of April 20)


  • Growing degree days rising quickly; be prepared
  • Winter damage

Insects/other pests

  • Elm bark beetles
  • Spruce needleminers
  • Juniper webworm
  • Zimmerman pine moth
  • Eastern tent caterpillar
  • European pine sawfly
  • Gypsy moth



  • Cedar rust updated
  • Phomopsis gall