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Durum
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Tan SpotTan spot caused by Pyrenophora tritici-repentis (Died.) Drech. anamorph Drechslera tritici-repentis (Died.) Shoem. is a major foliar disease affecting durum and bread wheat producerd in North Dakota. The adoption of conservation tillage practices and lack of adequate genetic resistance in modern wheat cultivars have increased incidence of tan spot. Economic losses due to tan spot epidemics can be expressed in lower grain yield, reduced kernel weight, and pink kernel discoloration. Sources of resistance to tan spot that are being used in the breeding program. The modified pedigree selection method is being used to develop durum wheat cultivars resistant to tan spot. Greenhouse and field tan spot evaluations begin at the F5 progenies and subsequent generations. In 1996, the breeding program released the durum wheat cultivar Ben that has a good level of resistance to tan spot.
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