fbpx Plant Health Care Report issue 2020-4 | The Morton Arboretum

Plant Health Care Report issue 2020-4

May 15, 2020

The scouting report of The Morton Arboretum for May 15, 2020.


PDF iconPlant Health Care Report issue 4 for May 15, 2020 (PDF)


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What indicator plant is in bloom in Dupage County?
Common lilac (Syringa vulgaris) is beginning to flower

Accumulated Growing Degree Days (Base 50): 121.5 (as of May 14)
Accumulated Growing Degree Days (Base 30): 1231.5 (as of May 14)


Insects/other pests

  • Viburnum leaf beetle update
  • Aphids
  • Hydrangea leaftier
  • Pine needle scale
  • Murder hornet



  • Ralstonia pest alert
  • Wetwood and slime flux
  • Phomopsis tip blight
  • Plant viruses



  • Bishop’s Weed



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