I came across this story while I was surfing the Web earlier. The NYT said last month:

For decades, wheat was a commodity no American needed to think much about, except the farmers who grew it. The grain was usually plentiful and prices were low.

All of a sudden, those assumptions have been turned upside down. With demand soaring abroad and droughts crimping supply, the world’s wheat stockpiles have fallen to their lowest level in 30 years, and stocks in the United States have dropped to levels unseen since 1948.

Scary, right? Then I remembered reading this story from the New Scientist  last year about a wheat infection that could have far-reaching ramifications. Here are the first three graphs:

"This thing has immense potential for social and human destruction." Startling words - but spoken by the father of the Green Revolution, Nobel laureate Norman Borlaug, they are not easily dismissed.

An infection is coming, and almost no one has heard about it. This infection isn't going to give you flu, or TB. In fact, it isn't interested in you at all. It is after the wheat plants that feed more people than any other single food source on the planet. And because of cutbacks in international research, we aren't prepared. The famines that were banished by the advent of disease-resistant crops in the Green Revolution of the 1960s could return, Borlaug told New Scientist.

The disease is Ug99, a virulent strain of black stem rust fungus (Puccinia graminis), discovered in Uganda in 1999. Since the Green Revolution, farmers everywhere have grown wheat varieties that resist stem rust, but Ug99 has evolved to take advantage of those varieties, and almost no wheat crops anywhere are resistant to it.