Plant Health Care Report Issue 2013-05

May 17, 2013

The Scouting Report of The Morton Arboretum for May 17, 2013.

PDF iconPlant Health Care Report 2013-05

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Horsechestnut (Aesculus hippocastanum)
Horsechestnut (Aesculus hippocastanum)
photo: John Hagstrom

What indicator plant is in bloom at the Arboretum?
Redbud (Cercis canadensis) is in late bloom
Horsechestnut (Aesculus hippocastanum) is blooming

Accumulated Growing Degree Days (Base 50): 171 (as of May 16)
Accumulated Growing Degree Days (Base 30): 1022 (as of May 16)


  • Viburnum crown borer
  • Brown marmorated stink bug
  • Wooly alder aphid
  • Eastern tent caterpillar
  • Cankerworm
  • Elm bark beetle
  • Elm leafminer
  • European elm flea weevil


  • Apple scab
  • Rust on buckthorn