fbpx Plant Health Care Report issue 2017-6 | The Morton Arboretum

Plant Health Care Report issue 2017-6

June 16, 2017

The scouting report of The Morton Arboretum for June 16, 2017.

PDF iconPlant_Health_Care_Report_2017_6 (PDF)


Bartlett Tree Experts, Presenting Sponsor of the Plant Clinic.



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What indicator plant is in bloom at the Arboretum?
Panicled hydrangea (Hydrangea paniculata) is in very early flower

Accumulated Growing Degree Days (Base 50): 718.5 (as of June 15)
Accumulated Growing Degree Days (Base 30): 2694.5 (as of June 15)


Insects/other pests

  • Viburnum leaf beetle update
  • Lecanium scale update
  • Hawthorn leafminer
  • Lace bugs
  • Fletcher scale
  • Two-marked treehopper
  • Leafhoppers
  • Currant spanworm
  • Grape flea beetle
  • Galls, chapter 2



  • Downy leaf spot on hickory
  • Oak leaf blister
  • Black spot on rose
  • Septoria on phlox