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Alternaria blight in sunflower, caused by the fungus  Alternaria helianthi , is one of the major diseases that affects sunflower in Brazil. The effect of this organism on net photosynthetic rate of four sunflower genotypes was measured under field experimental conditions. Through a mathematical approach the diseased leaf area and net photosynthetic rate were related and used to analyze the pathosystem sunflower/ Alternaria . An average decrease in the photosynthetic rate was observed in diseased leaves for all analyzed genotypes in comparison with healthy leaves. Alternaria blight reduces photosynthesis not only through a reduction in green leaf area, but also through an effect on photosynthesis of the remaining green leaf tissue. Leaves free of the pathogen lesions in diseased plants present also a photosynthetic reduction.

VIRTUAL LESION OF ALTERNARIA BLIGHT ON SUNFLOWER / LESIÓN VIRTUAL DE ALTERNARIA EN GIRASOL / DOMMAGE VIRTUEL D’ ALTERNARIA SUR LE TOURNESOL