Abstract
AFTER infection with beet yellows virus (SBYV) the older leaves of sugar beet (Beta vulgaris L.) become thickened, brittle and yellow, and develop red or brown necrotic spots. Infection with sugar beet mild yellowing virus (SBMYV), a virus unrelated to SBYY, produces an orange-coloured chlorosis of the older leaves with thickening and brittleness but without necrotic spots1. This communication is concerned with chromatographic differentiation of these viruses through characteristic lipids extracted from leaves.
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