Eutypella Canker on Maple: Symptoms, Life Cycle, and Management

Pathogen and Impact The fungus Eutypella parasitica kills the cambium (growing layer under bark), causing a pronounced bulge of callus around the infected area on red, sugar, silver, Norway, and other maples. Dead bark r

Euonymus Diseases: Anthracnose and Crown Gall Management

Disease Reference Table DiseaseSymptomsPathogen/CauseManagement Anthracnose Small spots pepper leaves of evergreen euonymus. Orange-brown, slightly raised stem canker may develop, causing branch dieback. Glomerella

Elm Tree Diseases: Symptoms, Causes, and Management Strategies

Disease Reference Table DiseaseSymptomsPathogen/CauseManagement Black Leaf Spot Small, black, slightly raised, rough spots on leaves; leaves yellow and fall prematurely. Stegophora ulmea (formerly Gnomonia ulmea) No

Douglas-Fir Diseases: Needlecasts, Twig Blight, and Management

Douglas-Fir Disease Overview Douglas-fir (Pseudotsuga menziesii) is affected by several needlecast and blight diseases. The following summarizes key diseases, symptoms, pathogens, and management. DiseaseSymptomsPathoge

Diagnosing Root Death in Woody Ornamentals: A Systematic Approach

Root death is a primary cause of decline in woody plants. When roots die, the plant cannot absorb sufficient water and nutrients to support growth, leading to visible above-ground symptoms that often appear long after ro

Common Dogwood Diseases: Symptoms, Causes, and Management

Dogwood Disease Overview Flowering dogwood (Cornus florida) and other Cornus species are affected by several significant diseases. The following table summarizes key diseases, their symptoms, pathogens, and management st

Cytospora Canker on Spruce: Identification and Control

Resin oozing from canker on branch Blue and Norway spruces are highly susceptible to Cytospora canker, a branch-killing disease caused by the fungus Cytospora kunzei. The disease manifests as sunken, dead areas of bark

Understanding Crown Gall: Causes, Symptoms, and Management

Young crown gall Crown gall is a widespread plant disease caused by the bacterium Agrobacterium tumefaciens. This pathogen infects a broad range of herbaceous and woody plants, entering through wounds on stems or roots.

Crabapple Disease Management: Comprehensive Guide to Major Diseases

Complete Crabapple Disease Management for Landscape and Nursery Crabapples face Botryosphaeria canker, fire blight, scab, cedar-apple/related rusts, and frogeye leaf spot. Resistant cultivars are available for fire bligh

Cotoneaster Disease Management: Botryosphaeria Canker and Fire Blight Control

Managing Diseases in Cotoneaster Cotoneaster faces Botryosphaeria canker and fire blight. Fire blight-resistant cultivars are available, providing a key management tool for this popular landscape genus. Botryosphaeria C

Chestnut Disease Management: Blight, Leaf Spot, and Twig Canker

Managing Diseases in Chestnut Trees Chestnuts face blight, leaf spot, and twig canker. American/European chestnuts are blight-susceptible; Chinese/Japanese have some resistance. Effective management varies by disease and

Cherry Disease Management: Black Knot, Brown Rot, Leaf Spot, Canker, and Viral Control

Comprehensive Cherry Disease Management Cherries face black knot, brown rot, Coccomyces leaf spot, Leucostoma canker, and necrotic ring spot virus. Effective management combines sanitation, fungicide timing, and variety

Cedar-Apple and Related Rusts on Ornamentals: Complete Host Range and Management

Understanding Gymnosporangium Rusts on Ornamentals Cedar-apple rust and related diseases (cedar-quince, cedar-hawthorn, Japanese apple rust) are caused by Gymnosporangium species. These fungi require TWO different living

Catalpa Disease Management: Leaf Spot, Powdery Mildew, and Verticillium Wilt

Managing Diseases in Catalpa Trees Catalpa faces leaf spot, powdery mildew, and Verticillium wilt. The first two cause minimal damage and dont warrant control; Verticillium wilt is serious and untreatable. Leaf Spot Bro

Canker Stain in Sycamore and London Plane Tree: Lethal Fungus Management

Managing Ceratocystis Canker Stain in Sycamore and London Plane London plane and sycamore are susceptible to Ceratocystis fimbriata f. sp. platani, a lethal fungus. Living wood cells (phloem, cambium, sapwood) are invade

Cankers of Hardwood Deciduous Trees: Types, Diagnosis, and Management

Understanding Cankers on Deciduous Woody Ornamentals Cankers are localized areas of dead bark and underlying wood on twigs, branches, and trunks. They can be caused by living organisms (fungi, bacteria) or non-living fac

Boxwood Disease Management: Decline, Blight, and Nematode Control

Comprehensive Boxwood Disease Management Boxwood faces a complex of diseases including decline, blight (caused by Neonectria pseudonaviculatum), leaf burn, leaf spot, nematodes, and Volutella blight. Effective management

Botryosphaeria Canker: Host Range, Symptoms, and Management

Understanding Botryosphaeria Canker on Woody Ornamentals The fungus Botryosphaeria causes branch dieback on a vast host range: horsechestnut, redbud, dogwood, beech, walnut, tulip poplar, sweetgum, crabapple, pine, oak,

Boston Ivy (Parthenocissus) Leaf Spot Management

Managing Leaf Spot on Boston Ivy Boston ivy (Parthenocissus) is affected by a specific leaf spot disease caused by Guignardia bidwelli f. sp. parthenocissi. The disease causes angular reddish to gray-brown spots that enl

Black Knot of Prunus: Identification, Life Cycle, and Management

Managing Black Knot on Plums, Prunes, and Cherries The fungus Plowrightia morbosa (Apiosporina) causes dark brown/black, long, swollen galls/knots on branches of most cultivated plums, prunes, and cherries. Highly destru