The Callery pear, Pyrus calleryana, is native to China Taiwan, Korea, Vietnam, and Japan.
The Callery pear was first introduced to the U.S. in 1909 and was later introduced again in 1916.
Early in the 1900s, the cultivated pear industry in the U.S. was being devastated by fire blight. The Callery pear was introduced to combat the disease.
The Bradford pear is more resistant to fire blight than other cultivars making it particularly popular.
The Callery pear is on lists of invasive plant species in Alabama, Georgia, North Carolina, Maryland, New Jersey, and Pennsylvania, and is being watched in states including Tennessee, New York, South Carolina, and Oklahoma.
Increases risk of wildfiresIncreases soil erosionOutcompetes native plant speciesCarries diseases natives are vulnerable to
The Bradford cultivar outcompetes native species, hinders the establishment of late and middle stage successional species, and provides food for invasive species such as the European starling.
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