Plant Health Care Report issue 2018-4

May 11, 2018

The scouting report of The Morton Arboretum for May 11, 2018.

PDF iconPlant_Health_Care_Report_2018_4 (PDF)

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What indicator plant is in bloom at the Arboretum?
Koreanspice viburnum (Viburnum carlesii) is in full flower.

Accumulated Growing Degree Days (Base 50): 200 (as of May 10)
Accumulated Growing Degree Days (Base 30): 1057 ( as of May 10)


Insects/other pests

  • Viburnum leaf beetle
  • European pine sawfly update
  • Elm flea weevil
  • Eastern tent caterpillar update
  • Carpenter bees
  • Hydrangea borer



  • Cytospora canker
  • Rhizosphaera needlecast
  • Volutella revisited



  • Timing for EAB treatments





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