Stem rust caused by Puccinia graminis f. sp. secalis Eriks. & E. Henn. in rye is a devastating disease in areas with continental climate. The minimum temperature for the infection is 15°C with an optimum temperature for reproduction of 26°C at high light intensity. Thus, stem rust is gaining increasing importance for rye cultivation in view of the global climate change.
Uredinia with brick-red uredospores occur after flowering mainly on stems but may be observed on leaf sheaths, leaves, and spikes as well.
Genetic Disease Prevention
Genetic analysis of resistance to powdery mildew in rye led to the identification of resistance genes. These valuable genetic variants have been integrated in rye breeding programs to develop cultivars less susceptible to this fungal pathogen.