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Aphids
Many species of aphids or plant lice occur on ornamental trees and shrubs in Pennsylvania.
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Black Leaf Spot
Leaf spot is a common descriptive term applied to a number of diseases affecting the foliage of ornamentals and shade trees. The majority of leaf spots are caused by fungi, but some are caused by bacteria. Some insects also cause damage that appears like a leaf spot disease. Leaf spots on trees are very common and generally do not require spraying. Leafspot may result in some defoliation of a plant. An established plant can tolerate almost complete defoliation if it happens late in the season or not every year. Small or newly planted trees that become defoliated are more at risk of suffering damage until they become established.
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Botryodiplodia Canker
Pathogen—Botryodiplodia canker is caused by fungal species in the genus Botryodiplodia, including B. hypodermia and B. theobromae. Botryodiplodia is the asexual form of the fungus. The sexual states for some of the Botryodiplodia species are Botryosphaeria spp.
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Dutch Elm Disease
Dutch elm disease (DED) is one of the most destructive shade tree diseases in North America. The disease affects American…
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Elm Bark Beetle
Three species of bark beetles are associated with elms in the United States.
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Elm Leaf Beetle
The elm leaf beetle is an introduced pest that feeds only on species of elm.
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Elm Yellows
Elm yellows symptoms begin in mid to late summer with the chlorosis and drooping of petioles of turgid leaves and…
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European Elm Scale
Mature females are up to 10 mm long oval and grayish-brown with a white waxy fringe ovisac.
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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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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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Spider Mites
Spider mites are not insects, and are more closely related to spiders.
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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.