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Identification of the causal agent of the disease "amachamiento" of common bean was carried out using four tests: analysis of double strand RNA (dsRNA) of viral origin, DAS-ELISA technique, applying Koch's postulates and the pathogenicity test. The analysis to detect dsRNA brought about two bands of approximately 1100 and 3200 bp, a similar pattern of bands for a member of genus Bromovirus. However, those bands were present only in 55.5% of the diseased plant samples analyzed; consequently, it was not possible to establish an association of a virus with the disease. The DAS-ELISA test did not detected Cowpea chlorotic mottle virus (CCMV) in any samples of diseased plants, confirming that the causal agent of the disease is not this virus. By using both Koch's postulates and the pathogenicity test, the nematode Aphelenchoides besseyi Christie was identified as the real causal agent of the bean disease "amachamiento" and we were able to discard other pathogen organisms previously proposed as responsible for the disease (CCMV and phytoplasm).

Aphelenchoides besseyi Christie (Nematoda: Aphelenchoididae), agente causal del amachamiento del frijol común