Nitrogen fertilization in relation to durum wheat and tan spot (Pyrenophora tritici-repentis) development.
1990
Jones J. | Abdel Mounem M. | Ryan J.
Tan spot, caused by Pyrenophora tritici-repentis (Died) Drechs, is a major disease of cereals in Morocco, especially durum wheat (Triticum durum L.). Chemical control is not a feasible approach for most farmers. Development of resistant varieties is the most attractive solution. Furthermore, there have been reports that nitrogen fertilizers, especially ammonium forms, reduce the incidence of tan spot. This on-farm trial on a Petrocalcic Palexeroll soil examined N response (0, 40, 80 and 120 kg/ha) of one resistant and two susceptible durum wheat lines. All lines responded to N depending on rate. While disease counts were high for the susceptible lines, the "resistant" one was moderately infected also. The response of these lines to N was inconsistent; however, one susceptible line showed less infection with added N. Mechanisms involved in the differential response are not clear.
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