Crabapple Archives
Insects and diseases that can affect Crabapple (Malus).
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Aphids
Many species of aphids or plant lice occur on ornamental trees and shrubs in Pennsylvania.
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Apple Scab
Apple scab is Pennsylvania's most important apple disease, attacking wild and cultivated apple and crabapple.
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Botryosphaeria Canker
The fungus Botryosphaeria can cause a branch dieback on many woody ornamentals. Cankers girdle and kill twigs and branches of species such as horsechestnut, redbud, dogwood, beech, walnut, tulip poplar, sweetgum, crabapple, pine, oak, rhododendron, azalea, rose, willow, elm, and yew. Small black fungal fruiting structures which contain fungal spores develop in the canker.
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Cedar Apple & Cedar Hawthorn Rust
Cedar-apple rust and closely related diseases, cedar-quince, cedar, hawthorn, and Japanese apple rusts are caused by fungi of the genus Gymnosporangium.
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Eastern Tent Caterpillar
The Eastern tent caterpillar has been observed in the United States since 1646.
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Fall Webworm
The fall webworm is a widely distributed native pest that appears from late summer through early fall. It feeds on many species of deciduous trees and shrubs.
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Fire Blight
Fire blight is a disease caused by the bacterium Erwinia amylovora. Twigs, branches, and leaders on trees and shrubs wilt…
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Lecanium Scale
The European fruit lecanium is a key soft scale insect pest of shade trees and other woody ornamental plants in…
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Powdery Mildew Cross Listing
While some powdery mildews attack a very few specific plants, others have a broad host range and infect many different…
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Southern Red Mite
The female adult is about 0.38 mm long and resembles a small spider.