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Its elegant white flowers line city streets to signal the arrival of spring, but this once-popular plant has become a threat to eastern ecosystems. The Callery pear tree has been considered an invasive tree for years, but effective Jan. 1, Ohio became the first state to ban the planting and distribution of this ornamental tree.
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The Callery pear (Pyrus calleryana) is native to Asia and was brought to North America by USDA scientist Frank Meyer in the early 1900s. At first, this particular variety of pears was a godsend. Fire blight is a common bacterium on pears that has spread across the country.
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“Take the Callery variety Bradford pear, for example,” he explains. “It is very fragile and poses a safety risk to people and their property. New varieties have been developed to address this problem, but in general the plant grows much faster than native plants. This is valuable for these plants such as sunlight Resources pose a risk.”
