An oak is a hardwood tree or shrub in the genus Quercus of the beech family. They have spirally arranged leaves, often with lobed edges, and a nut called an acorn, borne within a cup. The genus is widely distributed in the Northern Hemisphere; it includes some 500 species, both deciduous and evergreen. Fossil oaks date back to the Middle Eocene. Molecular phylogeny shows that the genus is divided into Old World and New World clades, but many oak species hybridize freely, making the genus’s history difficult to resolve.
Diseases Affecting Oak
Tubakia Leaf Spot
Tubakia leaf spot is different than anthracnose, so consultants and homeowners have questioned whether they should be concerned. This disease is not new but is still not as well known as anthracnose.
Affected Species:
Insects Affecting Oak
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.
Two-lined Chestnut Borer
Adult two-lined chestnut borers are slender, black beetles with a bluish to greenish hue that are 1/5-1/2 inch (5-13 mm) long with two faint, yellowish stripes along their back. Larvae are legless, white, slender, and about 1 inch (2.5 cm) long when fully grown with two spines at the tip of the abdomen and have…
Lecanium Scale
The European fruit lecanium is a key soft scale insect pest of shade trees and other woody ornamental plants in…
Affected Species:
Aphids
Many species of aphids or plant lice occur on ornamental trees and shrubs in Pennsylvania.
Affected Species:
Tubakia Leaf Spot
Tubakia leaf spot is different than anthracnose, so consultants and homeowners have questioned whether they should be concerned. This disease is not new but is still not as well known as anthracnose.
Affected Species:
Please give us a call if you have any questions about your trees and shrubs or would like to schedule an appointment for us to walk your property.
610.525.1562
