First Report of Pustula tragopogonis, the Cause of White Rust on Cultivated Sunflower in Southern Germany

Plant Disease
M ThinesOtmar Spring

Abstract

Pustula tragopogonis (Pers.) Thines (2), formerly known as Albugo tragopogonis (Pers.) Gray, causes white rust on some members of the Asteraceae. It has been reported to attack cultivated sunflower in several parts of the world, for example, North America (1) and South Africa (3), but has not been previously reported on sunflower in Germany. During June 2003, the first diseased plants were observed in a sunflower field near Stuttgart, where sunflowers were grown as ornamentals. During 2004, P. tragopogonis was found in several ornamental sunflower fields in southern Germany. In some cases, P. tragopogonis co-occurred with Plasmopara halstedii (Farlow) Berl. & De Toni on the same plants. After a cold winter, the first diseased plants for 2005 were observed during June in the area around Stuttgart. The percentage of affected plants in the sunflower fields varied considerably, ranging from 20 to 80%. Only small lesions with oospores could be found on petioles and stems of infected plants. The typical spots with white blisters were observed mostly on leaves in the upper half of the plants, but also occurred on the bracteoles of the flower heads. Spots were chlorotic on the upper side of the leaf and exhibited whitish pustules on th...Continue Reading

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