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The effect of powdery mildew erysiphe graminis f sp hordei and leaf rust puccinia hordei on spring barley in new zealand ii. apical development and yield potential



The effect of powdery mildew erysiphe graminis f sp hordei and leaf rust puccinia hordei on spring barley in new zealand ii. apical development and yield potential



Plant Pathology (Oxford) 35(1): 54-60



Reduced yields caused by powdery mildew and leaf rust in two seasons were associated with reduced plant growth. Combinations of early, late and full epidemics in one season, and 12 epidemic combinations in the second, were designed to identify crop sensitivity to disease by comparing growth and development with healthy plants. Early epidemics reduced ear number by increasing tiller death, and reduced grain number by effects on spikelet, floret or grain abortion, depending on the type of epidemic. Epidemics later in crop growth increased floret and grain abortion and also reduced grain weight. There was no compensation by later-determined components for reduced growth and delayed development at earlier growth stages. Plants infected at early growth stages were more sensitive to late infections, seen as effects on the later-determined components, than plants which were healthy initially. Interactions occurred between epidemics at different times and are likely to occur between diseases and other constraints.

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Accession: 006652007

Download citation: RISBibTeXText

DOI: 10.1111/j.1365-3059.1986.tb01980.x



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