Peer-review: Yes - Open Access: Yes|http://science.thomsonreuters.com/cgi-bin/jrnlst/jlresults.cgi?PC=MASTER&ISSN=0065-2113

Breeding spring wheat for resistance to stem rust and leaf rusts and other diseases has been in progress in the United States for fifty years. Resistant varieties, including durums, have been grown on a smaller or larger scale and for a longer or shorter period during a period of about forty years immediately following the past epidemics when durums largely supplanted bread whets in parts of the spring wheat area. In past, spring wheat has been reasonably well protected against rust in a total of about twenty years. Physiologic races, of which 15B is only one conspicuous example, have repeatedly transferred varieties from the resistant to the susceptible category. Everything possible should be done to reduce the number of physiologic races through eradication of alternate hosts. Extensive surveys must be continued to anticipate as much as possible the upsurge of dangerous races. The base of resistance in crop plants must be broadened. This requires a world-wide search for all of the genes that affect resistance directly and indirectly.

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