NOUVELLES ETUDES SUR LA TRANSMISSION DE LA TACHE ARGENTEE CHEZ LA POMME DE TERRE PAR DES SEMENCES CONTAMINEES

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Abstract
The number of tubers infected with silver scurf (Helminthosporium atrovirens (Harz) Mason et Hughes) in a crop and their distribution among potato hills are closely related to the degree of seed contamination. Wholly contaminated seed yielded the highest percentage of contaminated hills, infected tubers, and completely or nearly completely contaminated hills. Unlike other microorganisms that infect potatoes, H. atrovirens seems to survive in soil only where potato debris is found.

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