Abstract
Spore suspensions of a composite wheat isolate and a composite barley isolate of Septoria nodorum Berk. were used to inoculate two spring wheat and two spring barley cultivars under greenhouse conditions. Reisolations made from diseased leaves were cultured on two media in darkness or near-u.v. radiation. The composite wheat isolate of 5. nodorum was more damaging to the wheat hosts than to the barley hosts and caused less infection on barley hosts than the composite barley isolate; however, the highest levels of disease were obtained on the wheat cv. Sirius, inoculated with the barley isolate. Cultural differences in isolations were observed after passage through the opposite host; passage of the barley isolate through wheat resulted in higher sporulation than after passage through barley.
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