Impact of Cercospora Leaf Spot on Root Weight, Sugar Yield, and Purity of<i>Beta vulgaris</i>

Abstract

The impact of Cercospora leaf spot, caused by Cercospora beticola, on the yield and quality of sugar beets (Beta vulgaris) was studied in one field trial in 1982 and two trials in 1983. Fungicides were applied to cultivars of various disease susceptibilities to obtain different levels of disease severity. Plants were rated for disease severity with a spot-percentage scale according to the number of lesions per leaf at intensities <3% and with standard area diagrams at intensities ≥3% (.)