NEW TYPES OF VIRULENCE IN PYRENOPHORA TERES IN CANADA

descriptionPublicationkeyboard_double_arrow_right Article 01 Oct 1974 English Publisher:Canadian Science PublishingJournal:Canadian Journal of Plant Science, volume 54, pages 731-734 (issn: 0008-4220, eissn: 1918-1833,

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Authors: A. TEKAUZ; J. T. MILLS;

doi: 10.4141/cjps74-123

NEW TYPES OF VIRULENCE IN PYRENOPHORA TERES IN CANADA

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Abstract

Isolates of Pyrenophora teres (Died.) Drechsl. causing either net- or spot-type symptoms on barley (Hordeum vulgare L.) were collected in 1973 from fields near Winnipeg, Manitoba. Spot-type symptoms were similar to those of spot blotch incited by Cochliobolus sativus (Ito and Kurib.) Drechsl. ex Dastur. The cultivars Herta and Fergus, previously reported to be moderately resistant, were susceptible to both types of isolates. These two cultivars presently account for virtually all of the two-rowed barley and about half of the total barley acreage in Manitoba. The resistant hybrid lines CI 5791 and BT 201 retained their resistance to the isolates which produced net-type symptoms but were less resistant to those producing the spot type.

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