To provide the highest level of professional tree and shrub care to Philadelphia’s Main Line Communities, we pride ourselves on constant research.
Ours is a very specific and narrow field that requires learning through experience. Each property is unique and every year is different. To keep up with the latest thinking, we initiate contact with the leading arborists, entomologists and pathologists of our industry to discover and implement the best practices available for Plant Health Care.
See the most recent information on the pests and diseases that can affect your property through our gathered resources here.
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Alfalfa mosaic virus has a broad host range that includes over 600 plant species in 70 families.
Many deciduous hardwoods are susceptible to a leaf disease called anthracnose that is caused by various species of the fungus...
Apple scab is Pennsylvania's most important apple disease, attacking wild and cultivated apple and crabapple. Dull, olive-green areas visible on...
Venturia inaequalis
Ash leaf rust is one of the most spectacular rust diseases of trees in the Northeast.
Ash yellows is a recently discovered disease that causes slow growth and decline of ash (Fraxinus) species.
Informational table showing disease name, symptoms, pathogen/cause, and management of Azalea and Rhododendron diseases.
Bacterial blight of lilac, also known as shoot or blossom blight, is caused by the bacterium Pseudomonas syringae pv. syringae....
Leaf scorch, sometimes called marginal leaf burn, describes the death of tissue along the edge of the leaf. This symptom...
Beech bark disease causes significant mortality and defect in American beech, Fagus grandifolia (Ehrh.).
Black canker of willow is caused by the fungus Glomerella miyabeana. In North America and Europe, the black canker pathogen...
Black knot is a fungal disease that affects several species of Prunus. Outbreaks are common in both landscapes and natural...
Small, black, slightly raised, rough spots form on leaves. Leaves yellow and fall prematurely.
This fungus readily attacks young expanding leaves and young canes.
Foliar symptoms caused by Phytophthora canker reflect the disruption of water transport within the infected plant. Early symptoms include leaves...
Symptoms include the branches and eventually the entire plant blackens at the base and dies.
Botryodiplodia canker is caused by fungal species in the genus Botryodiplodia. The signs are small, black, pimple-like fruiting bodies (pycnidia)...
Cankers girdle and kill twigs and branches.
New to the U.S., Boxwood Blight was first described in the United Kingdom in the mid-1990s. Infecting all aboveground portions...
An overview of the types of diseases that affect the Boxwood. Phytophthora typically occurs in compacted soils with poor drainage.
On ornamental cherries, the first symptoms often seen are browing and collapse of the blossoms followed closely by death of...
London plane and sycamore trees are susceptible to a fungus, Ceratocystis fimbriata f. sp. platani, that is lethal.
Cedar apple rust and closely related diseases, cedar-quince, cedar-hawthorn, and Japanese apple rusts are caused by fungi belonging to the...
Cercospora leaf spot generally is not a serious disease of leucothoe. However, in years with a cool, rainy spring, Cercospora...
These fungi survive adverse conditions in leaves in the canopy and in fallen leaves. The spores they produce are wind...
Cherry leaf spot, caused by the fungus Blumeriella jaapii, attacks the leaves, leaf stems, fruit, and fruit stems of tart,...
Plants are stunted; leaves yellow and wilt as branches die. Many dark-brown to black lesions form on roots, enlarge, and...
Cytospora canker of conifers is caused by Valsa kunzei. From a distance, the most obvious symptom is dead or dying...
Austrian, Scots, ponderosa, mugo, red and other 2 and 3-needled pines are susceptible to the killing of shoot tips and...
Diplodia (formerly Sphaeropsis) tip blight is caused by the fungus Diplodia pinea. It is the most common and severe disease...
The early symptoms of discula anthracnose begin in mid to late May as leaf spots with tan or purple borders.
Downy mildew is the common name for a group of highly specialized obligate parasites of vascular plants.
Drought can impact many types of woody plants in landscapes, natural woodlots, and forests.
Dutch elm disease (DED) is one of the most destructive shade tree diseases in North America. The disease affects American...
Elm yellows symptoms begin in mid to late summer with the chlorosis and drooping of petioles of turgid leaves and...
Excess water can be a serious problem for many woody ornamentals.
Eastern Filbert Blight is caused by the fungus Anisogramma anomala and is indigenous to the Northeast United States.
Fire blight is a disease caused by the bacterium Erwinia amylovora. Twigs, branches, and leaders on trees and shrubs wilt...
Bacteria and fungi help organic matter decompose, so it is only natural that such mulches will sometimes have fungi and...
Gummosis is the oozing of sap from wounds or cankers on fruit trees.
The fungi Coniothyrium ilicinum and Phacidium species are two of several that regularly cause leaf spots on holly (Ilex) in...
An overview of Hydrangea diseases including Botrytis Blight, Cercospora Leaf Spot, Virescence and others.
Walnuts and hickories produce the chemical juglone (5 hydroxy-1,4- napthoquinone), which is exuded from all parts of the plant.
An overview of Juniper diseases including cedar-apple rust, cercospora blight and more.
Junipers (Juniperus sp.), also known as red cedars are susceptible to a disease that results in the death of twig...
The disease is most severe in nursery stock and seedlings where plants are grown closely together.
Walnuts and hickories produce the chemical juglone (5 hydroxy-1,4- napthoquinone), which is exuded from all parts of the plant
Leaf and flower galls are commonly found on many flowering woody hosts, most often on azalea and camellia.
Small irregular, reddish-brown spots and large blotches with yellow halos form in late June or early July. Most infected leaves...
The English ivy is a hardy evergreen vine that is grown widely as a ground cover under trees and in...
Leaf spot is a common descriptive term applied to a number of diseases affecting the foliage of ornamentals and shade...
Cytospora canker is one of the most destructive diseases of peaches, nectarines, apricots, sweet cherries, and plums in Pennsylvania.
The appearance of lichens are often related to damage from environmental stress or poor management. Exposed limbs on damaged plants...
Leaf Spot on Mountain Laurel will have large, tan to brown spots on leaves with a dark line on their...
A look at diseases, symptoms, causes and management of diseases that can affect the Dogwood tree.
Pear scab resembles apple scab in nearly all respects and is caused by the closely related fungus Venturia pirina. Although...
Symptoms on pear begin as yellowish-orange leaf spots early in the season. Young fruit and twigs can also be infected.
Pestalotiopsis is a type of needle blight fungal disease that is primarily found on arborvitae (Thuja). It is usually considered...
Witchhazel blight is caused by a fungus, Phyllosticta hamamelidis. The fungus causes brown lesions bordered by darker brown margins.
Bleeding Canker is a potentially lethal disease to mature European Beech trees (Fagus sylvatica).
Fungus-like organisms belonging to the genus Phytophthora are soil- or plant-borne and all are plant pathogens.
Austrian, Scots, ponderosa, mugho, red and other 2 and 3-needled pines are susceptible to the killing of shoot tips and...
While some powdery mildews attack a very few specific plants, others have a broad host range and infect many different...
Procera root rot also known as white pine root decline is caused by a fungus. It infects the inner bark...
Douglas-fir is the only known host of Rhabdocline. Rhabdocline needle cast infection occurs around bud break, when buds are opening...
Rhizosphaera needlecast disease is caused by the fungus Rhizosphaera kalkhoffii Bubak.
The elegance and beauty of azaleas and rhododendrons in bloom at the nursery have caused many an unsuspecting gardener to...
An overview of the types of diseases that affect the Roses.
Rose rosette disease has been spreading through much of the wild rose population of the Midwestern, Southern, and Eastern United...
Cedar-apple rust and closely related diseases, cedar-quince, cedar-hawthorn, and Japanese apple rusts are caused by fungi belonging to the genus...
The yellow-bellied sapsucker is the only member of the woodpecker family to cause the type of injury from boring numerous...
Seiridium canker is perhaps the most significant and damaging disease on Leyland cypress. This fungus is commonly associated with both...
Shothole can present as necrotic leaf spots with circular to irregular margins. Bacterial spots are brown surrounded by a reddish...
Blue and Norway spruces are susceptible to a branch killing disease caused by the fungus Cytospora kunzei.
Prior to 1999, when Stigmina lautii was identified in North Carolina on blue spruce, this needle cast pathogen was only...
Like most other fungal diseases, Swiss needle cast favors rainy, moist, and cool weather. Fruiting bodies develop through the stomata...
Thousand cankers disease (TCD) is a disease complex native to the western United States.
An overview of certain diseases of trees that weaken their structure and create a hazardous situations.
Tubakia leaf spot is different than anthracnose, so consultants and homeowners have questioned whether they should be concerned. Tubakia lesions...
Early indications that a tree has Verticillium wilt include heavy seed production, leaves that are smaller than normal, and the...
Both American and English boxwood are susceptible to this disease caused by the fungus, Pseudonectria rouselliana.
Brown to tan spots on the leaves are small at first but enlarge and may cover the entire leaf.
Willow scab, caused by the fungus Venturia saliciperda, affects Salix species throughout Europe and the eastern United States.
Weather conditions during the past few winters have been conducive for injury to woody ornamentals.
When heavy winds blow, major limbs — and sometimes entire trees — fall. The primary reason for this is poor structure, which results...
In the past 10 years, several significant pest and disease issues have become so common that we deal with them every day. Here...
Beech Leaf Disease (BLD) is emerging as the biggest threat to our trees since Emerald Ash Borer.
As we have communicated over the past...