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Published in Crop Sci 18:39-42 (1978)
© 1978 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Differential Response of Sugarbeet Cultivars to Cercospora Leaf Spot Disease1

G. A. Smith and S. S. Martin2

Preliminary observations and data on sugarbeet (Beta vulgaris L.) yield and quality components suggested that a possible differential response to infection by the fungus Cercospora beticola exists among sugarbeet cultivars and genotypes with different inherent levels of resistance and possibly among cultivars with similar resistance. The objectives of this study were: 1) to determine, for cultivars known to vary in leaf spot resistance, the effects of leaf spot disease on sucrose yield components and on extract chemical components which affect sugarbeet juice purity and 2) to examine whether infected cultivars with similar resistance to leaf spot respond in similar or different ways. Eight sugarbeet cultivars ranging from leaf spot resistant to leaf spot susceptible were examined under an artificially induced leaf spot epidemic in a 2-year field study. With increasing severity of C. beticola infection there was a general increase in nonsucrose chemical components, and decrease in gross sucrose yield, yield components, and purity. Of the chemical components, Na, nitrate, amino N, and total N consistently showed the greatest increases with increased infection by C. beticola. Numerous examples of differential response of the cultivars to C. beticola infection were found for nonsucrose chemical components as well as for sucrose yield and yield components.

Key Words: Genotype x environment interaction • Homeostasis • Sugarbeet purity • Cercospora beticola • Beta vulgaris L.

1 Joint contribution of the ARS, USDA, the Colorado State Univ. Exp. Stn., and the Beet Sugar Development Foundation. Published with the approval of the Colorado Exp. Stn. as Scientific Series Paper No. 2276.

2 Research geneticist and research plant physiologist, USDA, Crops Research Laboratory, Colorado State Univ., Fort Collins, CO 80523.

Received for publication April 29, 1977.




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