Ohio outlaws ubiquitous pear trees

Ohio this year has banned the sale of Callery pear trees that are crowding out native wild plants in many forests across the country.

Emerald ash borer can survive polar vortex

Winters on the Canadian prairies can be brutally cold, but researchers at Western University and Natural Resources Canada have found that even a freezing polar vortex poses little problem for the invasive emerald ash borer.

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