SUMMARY Twelve isolates of beet necrotic yellow vein virus, agent of rhizomania in sugar beet, have been obtained from five European countries and the USA. The isolates were cloned and multiplied in the local lesion host Chenopodium quinoa. By ELISA, a close serological relationship was observed among all the isolates. The isolates differed, however, in the number of viral RNA species present (2, 3 or 4) and in the lengths of RNAs 3 and 4, the two smallest RNAs. A comparison of the symptoms induced by the different isolates in C. quinoa revealed a correlation between the presence of a full‐length RNA 3 (about 1850 nucleotides) and the appearance of severe chlorotic local lesions.
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Kuszala et al. (1986) studied this question.
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