Researchers say study may help global efforts in controlling disease that still destroys crops today

It was a disaster that killed about 1 million people, devastating 19th century Ireland, but while the potato disease linked to the Irish famine is well known, a battle has raged over where it originated.

Scientists have long been divided over whether the fungus-like pathogen Phtytophthora infestans cropped up in the Andes or originated in Mexico.