Resumo

COVA, Jenny  e  RODRIGUEZ, Dorian. Fungi associated with leaf blight of onion (Allium cepa L.) in Lara State, Venezuela. Bioagro [online]. 2003, vol.15, n.3, pp.157-164. ISSN 1316-3361.

Leaf blight of onion is one of the most important diseases of the crop in Lara State. To determine the pathogens causing the disease and their relative importance, 22 leaf samples from 16 localities in four counties were analyzed through plant pathological standard techniques. Collected leaves showed visual symptoms of leaf blight. Stemphylium botryosum , S. vesicarium , and Alternaria alternata were isolated in 93.7, 12.5 and 50.0 % of the samples, respectively. A. alternata was always associated with S. botryosum . Pathogenicity tests with S. botryosum and A. alternata , either individually or combined, reproduced disease symptoms similar to those observed in the field. Contrary to what has been observed in different countries, S. botryosum was the main pathogen of onion leaf blight in Lara state, Venezuela.

Palavras-chave : Stemphylium; Alternaria .