Six decades after a banana-killing fungus all but wiped out plantations across Latin America, a new strain threatens to destroy global harvests.

A type of Fusarium wilt appeared this year in Australia’s main banana-growing state after spreading to Asia and Africa. While the fungus has been around since the 1990s and has yet to affect top exporter Ecuador, Fresh Del Monte Produce Inc. called it a potential “big nightmare.” The United Nations says the disease threatens supply, and Latin American growers are taking steps to limit the risk. MORE