From the world collection, 875 barley varieties of Turkish origin have been screened for resistance to local races of net blotch caused by Drechslera teres (Sacc.) Shoem. Six of these exhibited a high degree of resistance, which varied in expressivity when tested under a wider range of environmental conditions. In this respect these varieties rank between the consistency of resistance expressed by varieties from Ehtiopia, and the inconsistency with which resistance is expressed by varieties from Manchuria. The implications are discussed.