fbpx Plant Health Care Report Issue 2013-14 | The Morton Arboretum

Plant Health Care Report Issue 2013-14

July 26, 2013

The Scouting Report of The Morton Arboretum for July 26, 2013.

PDF iconPlant Health Care Report 2013-14

Hibiscus (Hibiscus moscheutos)
Hibiscus (Hibiscus moscheutos)
photo: John Hagstrom

Quick View

What indicator plant is in bloom at the Arboretum?
Rose of Sharon (Hibiscus syriacus) is starting to bloom (Cornell University lists this as being in bloom between 1400 and 1699 growing degree days Base 50)

Accumulated Growing Degree Days (Base 50): 1543 (as of July 25)
Accumulated Growing Degree Days (Base 30): 3789 (as of July 25)


  • Oak slug sawfly correction


  • Mycosphaerella leaf spot
  • Bull’s eye leaf spot
  • Guignardia on buckeye
  • Nectria canker


  • Slime mold
  • Is it really aster yellows?
  • Environmental stress