Common Tree Problems

Chlorosis

Chlorosis is a common problem of urban trees. It is in these environments that trees struggle to make chlorophyll and threfore become yellow. More…

Diplodia Shoot (Tip) Blight

Diplodia tip blight (formerly known as Sphaeropsis tip blight) is a fungal disease that kills the tips of the branches of pines, and less frequently spruce and firs. More…

Dogwood Anthracnose

Dogwood anthracnose, Discula destructiva, can be a devastating disease of flowering dogwoods in the eastern United States, and Pacific dogwood in the Pacific Northwest.  Although most infections occur on landscape trees, it can also be found on native dogwoods in … More…

Drought Stress

Among the most common preventable tree problems is drought stress.  Drought impacts a tree in many ways because water drives all the processes within a tree.  From photosynthesis to root growth and nutrient uptake, water is a part of it … More…

Eastern Tent Caterpillar

In late spring and early summer, the eastern tent caterpillar creates an unsightly nest or tent in the crotch of branches. The feeding of the larvae in late spring and early summer strips the foliage from trees. More…

Elm Leafminer

Elm leaf miner is a native pest that feeds on the tissues in between the outer layers of elm leaves, causing browning and leaf drop. More…

Emerald Ash Borer

Emerald ash borer (EAB) is an invasive wood boring beetle from Asia that is predicted to infest all unprotected ash trees in the United States and Canada over the next 20 years. More…

Euonymus Scale

Euonymus scale, Unaspis euonymi, is an armored scale that is a very common pest of euonymus and pachysandra. Although the individual insects are small, infestations are often dense and plainly visible. Euonymus scale is now established in the United States … More…

European Elm Scale

European elm scale, Gossyparia spuria, is a soft scale insect that attacks a variety of elm trees as well as hackberry species. Heavy infestations may kill weakened trees and cause branch dieback in healthy trees. More…

European Pine Sawfly

European pine sawfly, Neodiprion sertifer, is an introduced pest that was first found in New Jersey in 1925. It affects a variety of pine species by feeding on the old needles in early spring. More…

Ficus Whitefly

Ficus whitefly have quickly become a serious pest, affecting the health and aesthetics of valuable ficus trees and hedges. More…

Forest Tent Caterpillar

The forest tent caterpillar strips the foliage from trees, builds cocoons on the sides of buildings, and becomes messy when crawling on sidewalks, patios, and driveways where they are frequently squashed More…

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