Pyrus calleryana
Bradford Pear
http://www.newinvaders.org/species/bradfordpear.pdf
http://www.invasive.org/weedcd/pdfs/wow/callery_pear.pdf
http://www.invasive.org/species/subject.cfm?sub=10957
http://www.dcnr.state.pa.us/forestry/invasivetutorial/callery_pear_m_c.htm
http://www.ncsu.edu/goingnative/howto/mapping/invexse/bradfor.html
Reproductive Success of Cultivated Pyrus Calleryana (Rosacaea) and Establishment Ability of Invasive, Hybrid Progeny
The Role of Intraspecific Hybridization in the Evolution of Invasiveness: A Case Study of the Ornamental Pear Tree Pyrus calleryana
First Report of Powdery Mildew Caused by Podosphaera leucotricha on Callery Pear in North America
On the Spread and Current Distribution of Pyrus calleryana in the United States
First Report of Gymnosporangium sabinae, European Pear Rust, on Bradford Pear in Michigan
The Beginning of a New Invasive Plant: A History of the Ornamental Callery Pear in the United States
Invasives Revisited: The Bradford Pear
Scientists Look for Clues Into How Tree Populations Become Invasive
