Disease Information

Disease Factsheets - Penn State

Cytospora Canker
Douglas Fir Diseases
Needlecasts
Phytophthora Root Rot
Pine Diseases
Ploioderma Needlecast
Rhabdocline Needlecast
Sphaeropsis (Diplodia) Tip Blight
Spruce Diseases
Spruce Needle Rust
White Pine Blister

Disease Factsheets - other Universities

Cornell Plant Pathology
Ornamental Pathology Internet Sites - N.C. State University
Needlecast Disease Identification on Balsam Fir - USDA Forest Service
Ornamental Pathologist's Internet Guide
USDA Forest Service Pocket Guide to Christmas Tree Diseases
Penn State Plant Pathology
US Forest Service Plant Pathology Images
USDA Northeastern Forestry Insect and Disease Leaflets
USDA Western Forestry Insect and Disease Leaflets

Images of Common Diseases

Atropellis canker
Lophodermium needlecast
Pine Gall
Ploioderm Lethale needlecast
Rhabdocline needlecast
Swiss needlecast
White Pine blister rust