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Celiac.com 09/25/2014 - Nine out of ten wheat crops around the globe are susceptible to a killer fungus that attacks wheat. The pathogen is Puccinia rust fungus. Puccinia triticina causes 'black rust', P.recondita causes 'brown rust' and P.striiformis causes 'Yellow rust'. Originally named Ug99, but now known as wheat stem rust, the fungus affects wheat, barley and rye stems, leaves and grains, and causes plants to rot and die just a few weeks after infection. Infections can lead up to 20% yield loss exacerbated by dying leaves which fertilize the fungus. The fungus regularly causes serious epidemics in North America, Mexico and South America and is a devastating seasonal disease in India, and a widespread outbreak could destroy flour supplies as we know them. Previous solutions to the problem of wheat stem rust relied on simple crossbreeding. Beginning in the 1940s, breeders began combining rust-sensitive commercial wheat with hardier rust-resistant strains. However, those solutions were only temporary at best, as the rust always managed to find a way around rust-resistant genes after just three or four years. Scientists now use what they say is a more effective method of thwarting rust, wheat breeding, called “pyramiding,” in which multiple rust resistant genes are loaded onto a single wheat strain, potentially keeping rust at bay for decades to come, but pyramiding takes up to 15 years to produce a rust-resistant wheat strain. This means that the vast majority of wheat strains under cultivation could be subject to rust in the mean time. Obviously, not all of the wheat strains susceptible to rust will be affected in any given year, but major outbreaks can and do happen. The possibility that large percentages of the world’s wheat crops could be destroyed by rust are very real, hence the intensity of the efforts to develop rust-resistant strains as quickly as possible. However, if these efforts fail, or lose traction, look for non-wheat crops to fill the gap. That will mean large numbers of people going gluten-free for reasons having nothing to do with celiac disease or dietary fads.