This is a listing of fact sheets available on common diseases of plants frequently grown in greenhouses, interiorscapes, and in outdoor landscapes and nurseries in the northeastern U.S. Since many other diseases and disorders are known to occur and new diseases are recorded frequently, this compilation should not be considered complete. The main purpose of this publication is to provide information helpful in the diagnosis of diseases and to give some indication of what measures must be taken to manage the problem.

Ornamental Plant Disease Fact Sheets

General Info
Bacterial Diseases of Ornamental Plants
Bacterial Leaf Scorch
Bedding Plant Diseases
Black Root Rot--Thielaviopsis
Botryosphaeria Canker
Botrytis
Cylindrocladium
Damping-Off
Diagnosis of Poor Plant Health
Disinfesting Tools and Equipment
Fungal Root Rots and Fungicide Use
Impatiens Necrotic Spot/Tomato Spotted Wilt Virus
Key Interior Plants and Key Diseases
Key Landscape Plants and Key Diseases
Overfertilization
Phytophthora Root Rot
Phytotoxicity
Powdery Mildew
Pythium Root Rot
References for Arborists, Nurserymen, and Landscape Maintenance Workers
Rhizoctonia
Soil Treatments to Control Soil-Borne Pests
Sources of Plant Diseases
Verticillium Wilt
Weigh Pesticides
What Is Growing in mMy Mulch? (Molds and Fungus)
Virus Diseases

Floral and Foliage Plants
African Violet
Aglaonema
Aster
Bacterial Blight on Geranium
Begonia
Calceolaria
Carnation
Christmas Cactus
Chrysanthemum
Cineraria (Senecio)
Cordyline (Ti Plant)
Crassula (Jade Plant)
Cyclamen
Dahlia
Daylily (Hemerocallis)
Delphinium
Dieffenbachia
Dracaena
Easter Lily
Edema of Geraniums
Exacum
Fern
Ficus
Fuchsia
Geranium
Gerbera
Gladiolus
Gloxinia
Gypsophila
Hydrangea
Impatiens
Iris (Bulbous and rRhizomatous)
Kalenchoe
Maranta
Marigold
Narcissus
Norfolk Island Pine Diseases
Palm
Pansy
Petunia
Philodendron
Poinsettia
Pothos
Primula
Schefflera
Snapdragon
Spathiphyllum
Statice
Syngonium
Tulip
Verbena
Zinnia

Woody Ornamental
Diseases on Woody Ornamentals
Amelanchier (Shadbush, Serviceberry)
Anthracnose on Shade Trees
Arborvitae
Armillaria Root Rot
Ash
Azalea/Rhododendron
Beech
Black Knot of Plum and Cherry
Boston Ivy (Parthencissus) Leaf Spot
Boxwood
Canker Stain on Sycamore
Cankers of Hardwood Trees
Catalpa
Cedar-Apple Rust
Cherry
Chestnut
Cotoneaster
Crabapple
Crown Gall
Cytospora Canker
Diplodia Tip Blight
Dogwood Decline
Dogwood
Douglas Fir
Elm
English Ivy (Hedera)
Euonymus
Eutypella Canker on Maple
Fire Blight on Woody Ornamentals
Forsythia
Grape Ivy (Cissus)
Hackberry
Hawthorn
Hemlock
Hickory
Holly
Honeysuckle
Horse Chestnut
Juniper
Juniper Twig Blight
Leucothoe
Lilac
Maple
Mountain Ash
Mountain Laurel
Nectria Canker
Needlecast Diseases and Their Management
Nematode-Caused Diseases: Woody Ornamentals
Oak
Oak Leaf Blister
Oak Wilt
Pachysandra
Pieris
Pine
Plum Pox Virus (PPV)
Poplar
Privet
Pyracantha
Redbud
Root Death Diagnosis: Woody Ornamentals
Rose Black Spot
Rose
Scheduling Woody Ornamentals
Spruce
Sycamore
Taxus (Yew)
Tree Diseases That Create Hazards
Tulip Tree
Viburnum
Vinca
Walnut
Willow