Eräitä lisäselvityksiä vuoden 1953 perunarutto- [Phytophthora infestans (Mont.) de Bary] epidemian luonteesta

In summer 1953 the potato blight caused serious damage to haulms and tubers of the potato, particularly in the southern parts of Finland (2, 4,8). At the same time the existence was established of various strains of Phytophthora infestans, appearing to differ in their pathogenity to the potato (Table 3). One strain of the fungus, which appeared in the parish of Jokioinen at least, also attacked the potato variety Aquila and Solanum tuberosum x clones (Table 4, Fig. 3), which had previously been regarded in Finland as resistant to the potato blight (Table 1, Figures 1 and 2). In the parish of Jokioinen, where the potato blight epidemic proved extremely severe, the months of July and August were much more rainy than usual (Table 2)