EFFECT OF SPECKLED LEAF BLOTCH, SEPTORIA PASSERINII SACC., ON THE YIELD AND MALTING QUALITY OF BARLEY

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Abstract
In 2 out of 5 years artificial inoculation of barley in field plots at Winnipeg, Manitoba, with speckled leaf blotch (Septoria passerinii Sacc.) caused statistically significant yield reductions of about 20 per cent. In 2 other years, inoculated plots yielded less than the check plots but the differences were not statistically significant. Tests on the malting quality of the grain from diseased and check plots of the last trial showed that the disease adversely affected the suitability of the barley for malting. Kernel shrinkage caused by the disease increased cleaning losses and reduced the amount of malt extract.

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