Abstract
The present paper deals with the results of surveys on the incidence of cereal stripe rust, caused by Pucc. glumarum E. et H., in Fukushima Prefecture, and consideration on the regional difference of its distribution.
The disease appears almost all over the prefecture, but it is usually not severe, except for Shirakawa district, where it attains sometimes to an epidemic extent in individual fields.
The following factors are considered to be the cause of occurrence of this epidemic; (1) delayed growth of the cereal crops as the result of cold winter; (2) delayed appearing of leaf rust which may compete with stripe rust; (3) low temperatures during late May-early June; (4) proximity to localities where the disease appears earlier, i. e. Kantodistrict and other south-western localities of Japan; (5) prevalence of south and south-west wind s in the season and (6) cultivation of susceptible varieties.
