New downy mildew race confirmed in spinach

08/30/2011 02:03:00 PM
Vicky Boyd

An international group of experts has confirmed a new race of downy mildew in spinach.

The race, now known as race Pfs 13, was first identified in January 2010 in spinach in Holtville, Calif., according to a University of California Cooperative Extension newsletter.

It has since been found elsewhere in California in both 2010 and 2011.

Those in the spinach industry say the find wasn't surprising as new races have developed during the past decades, starting with Pfs5 in 1996.

Most spinach hybrids currently cultivated are resistant to races 1-12.

Researchers with the International Working Group on Peronospora (the genus of downy mildew), University of California and University of Arkansas continue to monitor the situation.

Steve Koike of UC and Jim Correll of UA encourage the industry to continue submitting downy mildew oubreak samples to aid in the discovery of new races.



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