Insect & Disease Resource Center
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Emerald Ash Borer
Emerald ash borer (EAB) is an Asian beetle that threatens the existence of ash trees throughout North America. These insect pests have killed millions of ash trees in urban areas, woodlots, and nurseries, spreading via infested nursery stock and firewood. Regulatory quarantines rely on public cooperation and can be difficult to enforce. They can slow the spread of EAB, but cannot stop it.
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Spotted Lanternfly
The spotted lanternfly is an invasive insect species native to Asia. This insect’s eggs are laid in masses about 1” long and may look like patches of crusted mud. Hatched nymphs are black with white dots. Adults are about 1” long with gray forewings that have black spots. Hindwings are a vivid rose red color with black tips and a white band running down the center. They have black legs and heads and yellow and black abdomens.
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Bagworms
Bagworms are destructive pests of shrubs and woody ornamentals that are native to North America. Their spindle-shaped protective bags made from silk, debris and foliage provide camouflage, so they go unnoticed until there is significant plant damage.
Browse More Pests and Diseases
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Cedar Rust
There are multiple rust fungi that affect cedars (junipers): cedar-quince rust, cedar-hawthorn rust and cedar-apple rust. All of these rusts require two different hosts and alternate between them during the year. Cedar-quince rust appears as elongated branch swellings that produce orange spores.
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Algal Leaf Spot of Magnolia
Raised, wavy, cushion-like spots are symptoms of algal leaf spot, also known as green scurf. The spots are greenish, pinkish or grayish and less than 1 cm. in diameter. They may encircle a twig, creating a girdling canker.
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Anthracnose Disease of Deciduous Trees
Anthracnose is a common and destructive group of fungal pathogens that attack various shade trees.
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Aphids
Aphids, sometimes called plant lice, are soft-bodied, sucking insects. They tend to cluster in large colonies on new growth and come in a variety of species that may be green, black, red, orange, wooly, spotted or bow-legged.
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Apple Scab
Apple scab is a foliar leaf disease caused by the fungus Venturia inaequalis.
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Armillaria Root Rot
Armillaria root rot, also known as ‘honey fungus’ or ‘shoestring root rot’, is a group of decay fungi comprised of at least 11 species. It affects both landscape and natural habitat plants throughout the United States.
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Ash Flower Gall
Ash flower gall is a symptom of feeding activity of microscopic mites known as ash flower gall mites.