Species: 

Pyrus calleryana 

Common Name: 

callery pear

Systems Affected (standardized): 

disturbed/waste areas, forest/woodland, urban/garden

Regions(s) present (updated by AB): 

NE, SE

5563325-PPT.jpg
Impacts: 

Once established Callery pear forms dense thickets that push out other plants including native species that can’t tolerate the deep shade or compete with pear for water, soil and space. A single tree can spread rapidly by seed and vegetative means forming a sizeable patch within several years. Its success as an invader results from its capacity to produce copious amounts of seed that are dispersed by birds and possibly small mammals, seedlings that germinate and grow rapidly in disturbed areas and a general lack of natural controls like insects and diseases, with the exception of fire blight.

Source? likely to be reintroduced: 

was introduced to North America as an ornamental tree in the early 1900s. Due to widespread planting, P. calleryana has become common throughout the eastern United States and has invaded natural areas, especially disturbed areas.

Info Blurb: 

Forms dense thickets that crowd out other plants. Produces copious amounts of seed that are dispersed by birds. Seedlings grow rapidly. Introduced as an ornamental.

Native Regions in OK: 

NONE

Current and past designations: 

OWL

Present in OK?

Yes

Present in Bordering States?

TX, CO, KS, MO, AR, LA

Has Legal Status in BS?

NONE