Assessment of resistance in barley to Pyrenophora teres and Pyrenophora japonica

• Published in: Crop protection Vol. 11; no. 3; pp. 240 - 242
• Main Author: Scott, D.B.
• Format: Journal Article
• Language: English
• Published: Guildford Elsevier Ltd 01.06.1992; Butterworth Scientific Limited
• Subjects: Agronomy. Soil science and plant productions; Barley; Biological and medical sciences; Fundamental and applied biological sciences. Psychology; Genetics and breeding of economic plants; net blotch; Pest resistance; Plant pathogens; Pyrenophora japonica; Pyrenophora teres; resistance; spot-type net blotch; Varietal selection. Specialized plant breeding, plant breeding aims; net blotch; spot-type net blotch; Pyrenophora teres; Barley; resistance; Pyrenophora japonica; Monocotyledones; Plant pathogen; Hordeum vulgare; Variety trial; Cereal crop; Fungus resistance; Fungi; Chlorosis; Symptomatology; Gramineae; Angiospermae; Ascomycetes; Spermatophyta; Lesion; Thallophyta; Cultivar
• ISSN: 0261-2194; 1873-6904
• DOI: 10.1016/0261-2194(92)90043-5

Nine barley cultivars (cvs) were evaluated for their reactions to two leaf spot fungi, Pyrenophora teres and Pyrenophora japonica. The type of lesions occurring on headed plants after inoculation was a reliable indicator of susceptibility or resistance of cvs to net blotch and spot-type net blotch in the field. Adult-plant resistance to isolates of P. teres occurred in some Australian, European and American cvs used for malt production. No lesions or only small spots without chlorotic halos developed on headed plants of resistant cvs. Cultivars susceptible to P. teres showed typical net-blotch lesions, having dark-brown striations extending both longitudinally and transversely within the lesions. In the case of spot-type net blotch, lesions varied from dark-brown spots to solid stripes, spreading longitudinally between leaf veins. Most cvs showed an intermediary reaction to P. japonica, and only one cv. was very susceptible to this fungus.