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Productivity and Quality Responses of Red Clover (Trifolium pratense L.) Infected with Bean Yellow Mosaic Virus¹

The effect of bean yellow mosaic virus on the productivity, in vitro digestibility, and nitrogen and chlorophyll concentrations was examined using susceptible red clover clones from two varieties. The virus had no effect on the digestibility of the plants, but it did cause an increase in nitrogen concentration and a decrease in chlorophyll concentration and forage yield. Digestibility estimates obtained on healthy plants were associated positively with nitrogen concentration (r=.50), leaflet-to-stem dry matter (r=.50), and leaf dry matter percentage (r=.35), and were associated negatively with shoot height (r=–.54) and stem dry matter percentage (r=–.30). Digestibility of the virus-infected plants was not associated with any agronomic or chemical attribute.

Key Words: Digestibility • Nitrogen concentration • Clone variability • Correlations

² Research Geneticist, Crops Research Division, ARS, USDA, and Assistant Professor of Agronomy; and Assistant Professor of Plant Pathology, Univ. of Wisconsin, Madison, Wis. 53706.

Received for publication September 22, 1970.