Beech Bark Disease
Beech bark disease (BBD), a complex affecting American beech (Fagus grandifolia), includes both insect and fungal components.
Emerald Ash Borer
This insect was introduced into North America sometime in the 1990's.
The euonymus scale can cause complete defoliation and even death of the plant if infestations are heavy.
Maple Petiole Borer
Infestations of defoliating insect pests is common on the linden tree.
The gypsy moth, Lymantria dispar, is one of North America's most devastating forest pests.
Aphids are tiny sucking bugs that attack many plants including crabapple trees.
Honeylocust Plant Bug
Honeylocust plant bugs commonly infest honeylocust in late spring. This common damaging species of plant bug is generally green.
Asian Long-Horned Beetle
The Asian long-horned beetle (Anoplophora glabripennis) known as the starry sky or sky beetle is native to eastern China, Japan, and Korea.
Anthracnose is a group of diseases found on many deciduous and evergreen trees and shrubs; some trees such as sycamore, ash, and evergreen elms can be noticeably blighted.
Dutch Elm Disease
At one time, the American elm was considered to be an ideal street tree because it was graceful, long-lived, fast growing, and tolerant of compacted soils and air pollution. Then Dutch elm disease (DED) was introduced and began devastating the elm population.
Black knot is an important disease of cherry, because it degrades this valuable veneer and lumber species.
The chestnut blight fungus has virtually eliminated the American chestnut, as a commercial species, from eastern hardwood forests.
Maple Tar Spot
Several different fungi in the genus Rhytisma infect the leaves of maples and cause raised, black spots to form on upper leaf surfaces.
Sycamore Tree Blight
Anthracnose, also referred to as blight, is the most serious disease of the native (Platanus occidentalis) sycamore in Delaware.
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