Occurrence and significance of fungal diseases on linseed and fibre flax in England, France, and Germany.
During 1987-91, data on the occurrence of fungal diseases of linseed and fibre flax were obtained from trials, surveys and seed samples. Alternaria spp., Fusarium spp. and Pythium spp. were observed on seedlings in England, and Phoma exigua f.sp. linicola, Fusarium spp. and root-infecting fungi were the most frequent pathogens in France and Germany. At flowering, Oidium lini was widespread in England and Germany, as was Botrytis cinerea in some years. P. exigua was widespread in France and Germany and Fusarium oxysporum f.sp. lini was occasionally severe in England and France. During crop maturation, Septoria linicola [Mycosphaerella linicola] became widespread in Germany in 1990, as did Verticillium dahliae in all 3 countries in 1989 and 1990. After harvest, Alternaria spp., Fusarium spp. and B. cinerea were frequently present on seed, as were P. exigua, Colletotrichum linicola [C. lini] and V. dahliae occasionally, and the incidence of A. linicola was high in 1987 and 1988 in the UK. This paper was presented at a conference entitled Production and protection of linseed, held at Churchill College, Cambridge, UK, 18 Dec. 1991.