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Anthracnose
Many deciduous hardwoods are susceptible to a leaf disease called anthracnose that is caused by various species of the fungus Anthracnose.
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Aphids
Many species of aphids or plant lice occur on ornamental trees and shrubs in Pennsylvania.
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Bleeding Canker
Phytophthora bleeding canker kills the bark and outer sapwood tissues of trees and shrubs. The most prominent symptom of the disease is dark-colored sap oozing from bark cankers. The fluid is typically reddish-brown and it stains the surrounding bark as it flows downward. Infected bark is often water soaked and stained while the inner sapwood can exhibit a range of abnormal colors (brown, bluish-green, orange and pink) depending on the particular species of Phytophthora present.
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Cottony Maple Leaf Scale
Cottony maple leaf scale females are 3 to 4mm long and 2 to 4mm wide. They are slightly convex and are brown with a yellow-brown ridge down the back. The body is covered with flakes of clear wax. Their eggs are white to pale yellow and are meshed in a white, cottony ovisac which may be up to 5mm wide and 12mm long. Newly hatched nymphs are pale yellow or green and translucent. They closely adhere to the undersides of leaves and are easily overlooked.
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Cottony Maple Scale
The cottony maple scale is a highly modified insect pest that commonly attacks silver and red maples in Ohio.
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Japanese Beetle
Japanese beetle adults have metallic green bodies with coppery brown wing covers surrounded with 12 white tufts of hair.
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Japanese Maple Scale
The Japanese maple scale is a recently detected pest of a wide range of woody host plants in Pennsylvania.
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Leaf Spot Diseases on Shade Trees
Leaf spot is a common descriptive term applied to a number of diseases affecting the foliage of ornamentals and shade…
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Lecanium Scale
The European fruit lecanium is a key soft scale insect pest of shade trees and other woody ornamental plants in…
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Powdery Mildew Cross Listing
While some powdery mildews attack a very few specific plants, others have a broad host range and infect many different…
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Spotted Lantern Fly
Lycorma delicatula , commonly known as the Spotted Lanternfly (SLF), is a new invasive insect that has spread throughout southeastern Pennsylvania since its discovery in Berks County in 2014. SLF presents a significant threat to Pennsylvania agriculture, including the grape, tree-fruit, hardwood and nursery industries, which collectively are worth nearly $18 billion to the state's economy.
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Verticillium Wilt
Early indications that a tree has Verticillium wilt include heavy seed production, leaves that are smaller than normal, and the browning of the margins of leaves.