Plant Health Care Report issue 2017-4

May 19, 2017

The scouting report of The Morton Arboretum for May 19, 2017.

PDF iconPlant_Health_Care_Report_2017_4 (PDF)


Bartlett Tree Experts--Presenting Sponsor of the Plant Clinic


Bartlett Tree Experts, Presenting Sponsor of the Plant Clinic

Quick View

What indicator plant is in bloom at the Arboretum?
Old-fashioned weigela (Weigela florida) is in early flower

Accumulated Growing Degree Days (Base 50): 288 (as of May 18)
Accumulated Growing Degree Days (Base 30): 1709 (as of May 18)

Insects/other pests

  • European pine sawfly update
  • Viburnum leaf beetle update
  • Spruce spider mite
  • Aphids
  • Honeylocust plant bug
  • Elm leaf miner
  • Sawflies
  • Leaf rollers…
  • .. and other little caterpillars
  • Hydrangea leaftier
  • Scale
  • Pine spittlebug
  • Spittlebug
  • Galls, the first chapter



  • White pine blister rust
  • Anthracnose
  • Peach leaf curl
  • Wetwood and slime flux



  • Spring cold and wind damage