Ug99 is a new wheat rust. It was first found on wheat in Uganda, in 1999. It was found on a strain of wheat that has the Sr31 gene. This gene had been impervious to all forms of wheat rust, worldwide, prior to 1999.
Now over 90% of the species of wheat are completely vunerable to the Ug99 wheat rust. The other 10% of the wheats are only partially able to fend off the Ug99 wheat rust. However that other 10% of wheats are entirely vunerable to other types of wheat rust (other than Ug99)!
Scientists didn't start trying to battle Ug99 until 2002. Ug99 kills as much as 3/4ths of each wheat field it infects (sometimes more).
The march of Ug99 accross Africa is happening in a very predictable manner. By 2013 Ug99 will have reached India, and China, and covered Africa.
A hurricane could blow Ug99 to America, as hurricane Hugo blew soy bean rust to the U.S. Travelers can also bring Ug99 to places much faster.
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