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