fbpx Plant Health Care Report issue 2019-5 | The Morton Arboretum

Plant Health Care Report issue 2019-5

May 31, 2019

The scouting report of The Morton Arboretum for May 31, 2019.


PDF iconPlant Health Care Report issue 5 for 2019 (PDF)


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What indicator plant is in bloom at the Arboretum?
Black locust (Robinia pseudoacacia) is in flower

Accumulated Growing Degree Days (Base 50): 302 (as of May 30)
Accumulated Growing Degree Days (Base 30): 1639 (as of May 30)



Insects/other pests

  • Elm leafminer
  • Viburnum leaf beetle update
  • Hydrangea leaftier
  • Assassin bug (good guy!)
  • Galls, part one (it’s really in this issue)



  • Oak leaf blister
  • Peach leaf curl
  • Phomopsis tip blight



  • Poison hemlock



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