IDAHO WHEAT COMMISSION

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Stripe Rust Begins to Develop in Pacific Northwest

The wheat disease stripe rust has been found in a handful of isolated areas of the Pacific Northwest. The fungus was found on "isolated hotspots" on UI Magic in Morrow and Gilliam counties in Oregon, and two commercial fields near Walla Walla, Wash. It was also found at low levels in experimental fields near Pullman, Central Ferry and Walla Walla, said Xianming Chen, USDA Agricultural Research Service plant geneticist. Recent conditions have been favorable for stripe rust development, said Christina Hagerty, assistant professor of cereal pathology at Oregon State University.

"Late arrival of rust this year is good news for growers," she said. "The earlier rust arrives in the season, the bigger dent it typically makes on yield." For highly susceptible varieties, such as UI Magic and Mary, it is best to spray when rust is first found rather than wait for flag leaf emergence, Hagerty and other OSU researchers said in a recent alert to growers.