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The fungal ancestors of stem rust have infected grasses for millions of years and wheat crops for as long as they have been grown. [7] According to Jim Peterson, professor of wheat breeding and genetics at Oregon State University, "Stem rust destroyed more than 20% of U.S. wheat crops several times between 1917 and 1935, and losses reached 9% twice in the 1950s," with the last U.S. outbreak in ...
Ug99 is a lineage of wheat stem rust (Puccinia graminis f. sp. tritici), which is present in wheat fields in several countries in Africa and the Middle East and is predicted to spread rapidly through these regions and possibly further afield, potentially causing a wheat production disaster that would affect food security worldwide. [1]
Puccinia graminis is a macrocyclic heteroecious fungus that causes wheat stem rust disease. [citation needed] The sexual stage in this fungus occurs on the alternate host – barberry – and not wheat. The durable spore type produced on the alternate host allows the disease to persist in wheat even in more inhospitable environments.
In the 1950s zineb and mancozeb were developed as the primary means to control rust. Zineb reduced infection by 85% and mancozeb by 97% . [38] [39] By 1989 EBDC fungicides had become the most common fungicidal means to control rust on asparagus. However, after the EPA almost cancelled the use of EBDCs on asparagus many processors decided they ...
Elvin Charles Stakman (May 17, 1885 – January 22, 1979) was an American plant pathologist who was a pioneer of methods of identifying and combatting disease in wheat. He became an internationally renowned phytopathologist for his studies of the genetics and epidemiology of stem rust.
The life cycle of Puccinia graminis f. sp. tritici, commonly called stem rust of wheat, is notoriously complex, with five types of spores (macrocyclic) and two distinct host plants (heteroecious). This fungus is an obligate biotrophic (feeding on the living plant tissue) pathogen of cereal crops that can cause extensive yield loss (Schumann and ...
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The pathogen is a Puccinia rust fungus. It is the most prevalent of all the wheat rust diseases, occurring in most wheat-growing regions. [1] It causes serious epidemics in North America, Mexico and South America and is a devastating seasonal disease in India. P. triticina is heteroecious, requiring two distinct hosts (alternate hosts). [1] [2]
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