(1963) Songin, Włodzimierz; Wyższa Szkoła Rolnicza w Szczecinie. Katedra Szczegółowej Uprawy Roślin
Partial infection with blackleg decreased the tuber yields of two potato varieties - Lenino and Dar averagely 34% for four years. Nevertheless the tubers got from infected plants and stored in good conditions were affected with blackleg only in small degree (meanly 1,6%). In next years of reproduction the tuber-seeds derived from affected plants with blackleg were free from the disease.