Occurrence and importance of seed-borne Bipolaris sorokinana in Norwegian barley

摘要

During recent years Bipolaris sorokiniana has occurred at high frequencies in seed lots of the barley cvs Annabell and Edel in Norway. In seed treatment experiments with two heavily infected barley lots the infection level was reduced by chemical treatment and field emergence and yields were significantly increased. The best effect was seen with an imazalil + flutriafol compound which increased the yield by approximately 35% compared with untreated. A healthy untreated seed lot of the same cultivar showed approximately the same level of emergence and yield as the best fungicide treatment of a heavily infected seed lot.