Variation of Flecks and Lesions of Late Blight by Grafting Different Potato Varieties

Abstract

Scions of potato interspecific hybrid 1506-b (9) (R₁R₄ genes) on the stocks of interspecific hybrid 96-56 (R₁ gene) and vice versa showed both susceptible lesions and hypersensitive flecks by an inoculation of Phytophthora infestans (Race 1). Plants grown up from grafted potatoes (scions of susceptible Norin No.1 on the stocks of interspecific hybrid 96-56 and vice versa) showed both susceptible lesions and hypersenstive flecks by an inoculation of Phytophtora infestans (Race 0).