Common Tree Problems

Ambrosia Beetle

Ambrosia beetles have a broad range, but are most abundant in the southern and eastern regions of the United States.  The term ambrosia beetle refers to a number of species of the insect, 40 of which are native.  Several are … More…

Aphids

Aphids are one of the most common insects found on trees and shrubs. There are more than 400 species of aphids that feed on numerous hosts, creating sticky honeydew that can coat any surface underneath the tree or plant that is infested. More…

Apple Scab

Apple scab is a foliar disease that causes infected plants to lose their leaves prematurely. Although unsightly it is rarely a cause of tree death. More…

Ash Anthracnose

Ash anthracnose, Gloeosporium aridum, is a fungal disease that infects ash trees causing dead lesions on leaves. These lesions disrupt photosynthesis and transpiration, which can lead to early leaf drop in the spring, although a second flush of leaves soon … More…

Ash Plant Bug

Ash plant bug is rarely a fatal insect infestation, however the curling and discoloration on the leaves can be disconcerting. More…

Ash-Lilac Borer

The ash-lilac borer, Podosesia syringae, belongs to a group of insects known as clear-winged moths.  It is found throughout the United States and affects ash, privet and lilac, especially stressed plants.  The caterpillar phase of this insect develops under the … More…

Asian Cycad Scale

Asian cycad scales produce a white crust on the fronds of infested plants, making them appear as though they are snow covered. At its worst, an infestation of Asian cycad scale can completely coat a sago palm within months and cause its death within one year. More…

Azalea Bark Scale

Discovered in 1881, the azalea bark scale, Eriococcus azaleas,  is a prominent pest of rhododendron, azalea, and huckleberry (Vaccinium spp.).  It has been reported in the Eastern US, as well as Belgium and Russia.  This is a pest that generally … More…

Azalea Lace bug

What is azalea lace bug? The azalea lace bug, Stephanitis pyrioides, has become a destructive pest to azaleas in the eastern United States. This bug causes damage by sucking out the fluid of the leaves from their undersides. This feeding … More…

Bacterial Leaf Scorch

Bacterial leaf scorch causes rapid dieback in sections of valuable shade trees. Although not curable, the symptoms can be supressed using antibiotics. More…

Bagworms

Bagworms are destructive insects that attack many deciduous and evergreen trees and shrubs. More…

Birch Leafminer

Birch leafminer is the larval stage of a small “fly-like” wasp. The larvae feed between the epidermal layers of a leaf and are protected from predators and parasites by the leaf. More…

Bronze Birch Borer

Bronze birch borer is a native wood boring beetle that attacks birch trees that are stressed, e.g. by drought, soil compaction or insect feeding. More…

Bur Oak Blight

Bur oak blight, (Tubakia iowensis sp. nov.  –  a subspecies of Tubakia) is a  disease that causes petiole and leaf necrosis. The pathogen may have come from Europe or Asia but is potentially a localized mutation of Tubakia to the … More…

Calico Scale

Calico scales produce large amounts of honeydew in the spring which can coat tree leaves, branches, sidewalks, and cars More…

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