Resumo

SANCHEZ, MC; RIDAO, A del C  e  COLAVITA, ML. Diaporthe caulivora: agente causal de cancro del tallo predominante en cultivos de soja del sudeste bonaerense. FAVE. Secc. Cienc. agrar. [online]. 2015, vol.14, n.2. ISSN 1666-7719.

Diaporthe caulivora: predominant causal agent of stem canker in soybean crops in the southeast of Buenos Aires province Stem canker (SC) has been the most destructive disease of soybean in the southeast of Buenos Aires in the last agricultural cycles. Considering the current inclusion of the soybean in the production systems in this area, that the SC is a prevalent disease, and that Diaporthe caulivora (Dc) is the predominant causal agent in Argentina, it is important to know the identity of the agent prevalent in the area. The objectives of the study were to recognize by morphology the species of the Diaporthe/Phomopsis complex present in soybean crops during the agricultural cycles 2010/11-2011/12-2012/13, and confirmed using PCR-RFLP that the predominant species causing symptoms of SC was Dc. Out of 39 isolates, 61% corresponded to Dc, 26% to P. longicolla, only isolation to D. p. var. sojae, and four could not be determined. D. p. meridionalis were not detected. The predominant causal agent in the zone of the study was Dc.

Palavras-chave : Glycine max (L.) Merr; Diaporthe/Phomopsis; D. phaseolorum var. caulivora.

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