Crataegus commonly called hawthorn, quickthorn, thornapple, May-tree, whitethorn,[5] Mayflower or hawberry, is a genus of several hundred species of shrubs and trees in the family Rosaceae, native to temperate regions of the Northern Hemisphere in Europe, Asia, North Africa and North America. The name “hawthorn” was originally applied to the species native to northern Europe, especially the common hawthorn C. monogyna, and the unmodified name is often so used in Britain and Ireland. The name is now also applied to the entire genus and to the related Asian genus Rhaphiolepis.
Diseases Affecting Hawthorn
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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Insects Affecting Hawthorn
Hawthorn Leafminer
A moderately common pest problem observed on hawthorn trees in May and June is the hawthorn leafminer, Profenusa canadensis. The leafminer is the larval stage of a sawfly. The larvae live inside the leaf causing the leaf tips to turn brown. Leaves appear to be diseased or damaged by frost. However, frass and at certain…
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Hawthorn Lace Bug
Lace bugs are common pests of a variety of ornamental trees and shrubs.
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Aphids
Many species of aphids or plant lice occur on ornamental trees and shrubs in Pennsylvania.
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