Phytopathological problems of seedborne Alternaria linicola in linseed (Linum usitatissimum L.).
Thirty-one seed samples of linseed were tested by the deep freezing blotter method for the incidence of A. linicola. Only one sample was heavily infected by the fungus. The infected sample was used to compare the following seed health methods: freezing blotter; blotter; agar plate; rolled blotter; and sand. The results showed a good correlation between the 5 methods tested. The sand method gave the best simulation of the behaviour of the seed after sowing. The freezing blotter method is the cheapest and it is suggested that it may be used as an alternative to the methods suggested by the International Seed Testing Association (ISTA).