fbpx Plant Health Care Report issue 2018-5 | The Morton Arboretum

Plant Health Care Report issue 2018-5

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May 25, 2018

The scouting report of The Morton Arboretum for May 25, 2018.

PDF iconPlant_Health_Care_Report_2018_5 (PDF)

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What indicator plant is in bloom at the Arboretum?
Bridal wreath spirea (Spiraea x vanhouttei) is in bloom

Accumulated Growing Degree Days (Base 50): 341.5 (as of May 24)
Accumulated Growing Degree Days (Base 30): 1475.5 ( as of May 24)


Insects/other pests

  • Hydrangea  leaftier
  • Boxwood psyllid
  • Rose plume moth caterpillar
  • Elm leafminer
  • Galls-part 1



  • Cedar rust update
  • Powdery mildew on ninebark
  • Fire blight



  • Creeping bellflower
  • Poison hemlock



  • Cold damage

Bartlett Tree company logo

Bartlett Tree Experts, Presenting Sponsor of the Plant Clinic