Netzer, D., Agricultural Research Organization, The Volcani Center, Bet Dagan, 50 250, Israel
Globerson, D., Agricultural Research Organization, The Volcani Center, Bet Dagan, 50 250, Israel
Weintal, CH., Agricultural Research Organization, The Volcani Center, Bet Dagan, 50 250, Israel
Elyassi, R., Agricultural Research Organization, The Volcani Center, Bet Dagan, 50 250, Israel

None of the tested cultivars of lettuce was found resistant to Stemphylium leaf spot, a common disease in Israel. Within a Lactuca saligna population collected in wild lettuce in Israel, resistance was traced. Interspecific crosses of L. saligna x L. sativa were made and the mode of inheritance of resistance to this disease was studied. Resistance is apparently controlled by two genes: one dominant (Sm1) and one recessive (sm2). © 1985 Veenman B.V., Wageningen.