Anthracnose

• Maple Anthracnose, PA DCNR website
  www.dcnr.state.pa.us/forestry/pests/maple.htm
• Anthracnose, Morris Arboretum
  www.paflora.org/plantclinic/anthracnose.htm

Chestnut Blight 

• American Chestnut Cooperators' Foundation Homepage
  www.accf-online.org/ 

• Woolly Adelgid
  • Hemlock Woolly Adelgid, Morris Arboretum
    www.paflora.org/plantclinic/woollyadelgid.htm
  • What is the Woolly Adelgid?, PA DCNR
    www.dcnr.state.pa.us/forestry/woollyadelgid/index.aspx
  • What can landowners do about Hemlock Woolly Adelgid?, PA DCNR
    www.dcnr.state.pa.us/forestry/woollyadelgid/whatcanido.aspx
  • www.dcnr.state.pa.us/forestry/woollyadelgid/pestmanagement.aspx
  • Hemlock Woolly Adelgid- Integrated Pest Management
    www.hort.uconn.edu/ipm/homegrnd/htms/46wooly.htm
• Elongate Hemlock Scale
  • Hemlock elongate scale, Morris Arboretum
    www.paflora.org/plantclinic/hemlockelongatescale.htm

Oak diseases

• Oak leaf galls
  • 
    www.paflora.org/plantclinic/oakgalls.htm
• Oak twig galls
  • Oak twig galls, Morris Arboretum
    www.paflora.org/plantclinic/oaktwiggall.htm

Rusts

• Rusts, Morris Arboretum
  www.paflora.org/plantclinic/rusts.htm

Tulip tree scale

• Tulip tree scale, Morris Arboretum
  www.paflora.org/plantclinic/ttscale.htm