How climate change might be threatening the future of apples

Apples in Hopewell Junction, N.Y.,Foto: Bloomberg/Karolina Wojtasik

Patrick and Sara McGuire have been growing apples since they were married 25 years ago. Their 150 acres in Ellsworth, Mich.-dubbed Royal Farms-are a mix of sweet apples and the bitter varieties suited for making hard cider.

Last spring they put in a new crop of Honeycrisps, one of America's favorite apples, only to discover an unwelcome visitor just a few weeks later: A bacterial menace known as fire blight...

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