Incidence and control of barley leaf stripe (Pyrenophora graminea) in Scottish barley during the period 1987–1992 |
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| Authors: | V COCKERELL W J RENNIE M JACKS |
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| Institution: | Official Seed Testing Station for Scotland, Scottish Agricultural Science Agency, East Craigs, Edinburgh EH12 8NJ, UK |
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| Abstract: | The incidence of Pyrenophora graminea was determined in winter and spring barley seed harvested in each of the 6 years 1987 to 1992. The occurrence of P. graminea was highest in spring barley seed harvested in 1989 and 1990, with 69% of samples in 1989 and 82% in 1990 infected. The mean infection levels were 6·1% in 1989 and 7·5% in 1990. The introduction of a voluntary Code of Practice in January 1991 significantly reduced infection: in 1992 only 10% of spring barley samples were infected, and the mean infection level was less than 0·2%. In spring barley, there was a significant relationship between the level of seed infection and the percentage of diseased tillers in commercial crops ( r = 0·890, P < 0·001). However, tiller infection was consistently lower than seed infection. During the period of the study the mean annual leaf stripe infection on winter barley seed did not exceed 1%. |
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