Week_4B_Rusts - February 12 Catastrophic Plant Diseases...

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February 12 Catastrophic Plant Diseases III: RUSTS
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Wheat was most likely the crop first cultivated by early humans
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Fertile Crescent
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Wheat rust
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Wheat Rusts are caused by more than one fungus: Puccinia graminis - Black stem rust Puccinia striiformis - Stripe rust Puccinia recondita - Leaf rust Only experts can tell them apart in the field
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Rusts = Obligate parasites
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Wheat Barberry
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Sexual recombination of the wheat rust fungus occurs on common barberry. No barberry = no sex
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Wheat rusts overwinter in northern Mexico
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As wheat matures, rust migrates northward
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Long distance transport of viable rust spores happens because the spores have thick, pigmented walls.
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©USDA Cereal Disease Lab, St. Paul
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Northward spread of rust continues….
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…..until it reaches the Canadian prairies.
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Prevent wheat rust through breeding of rust resistant varieties
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Manage wheat rust also by removing common barberry bushes
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©USDA Cereal Disease Lab, St. Paul, MN
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Rusts don’t all look “rusty,” and all plants that look brown aren’t infected with a rust fungus.
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Week_4B_Rusts - February 12 Catastrophic Plant Diseases...

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