Plant Health Care Report Issue 2013-07

May 31, 2013

The Scouting Report of The Morton Arboretum for May 31, 2013.

PDF iconPlant Health Care Report 2013-07.pdf

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What indicator plant is in bloom at the Arboretum?
Cranberrybush Viburnum (Viburnum opulus var. americanum) is in late bloom.
Weigela (Weigela florida) is in early bloom.

Weigela (Weigela florida)
Weigela (Weigela florida)
photo: John Hagstrom

Accumulated Growing Degree Days (Base 50): 368.5 (as of May 30)
Accumulated Growing Degree Days (Base 30): 1494.5 (as of May 30)


  • Elm leaf miner
  • Fruitworms
  • Euonymus caterpillar
  • Azalea sawfly


  • Tobacco rattle virus on Epimedium
  • Powdery mildew on ninebark
  • Wetwood and slime flux on elm
  • Cedar-hawthorn rust on hawthorn