Resumen

ARGUELLO, E.; YOSSEN, V.; LUCINI, E.  y  CONLES, M.. Effect of leek extract (Allium porrum L.) on the survival of sclerotia of Sclerotium cepivorum. Agriscientia [online]. 2009, vol.26, n.1, pp.23-27. ISSN 1668-298X.

The use of sclerotial germination stimulants of Sclerotium cepivorum prior to crop planting is an alternative for the management of the disease. In the present work, we evaluated the effect of leek extract (Allium porrum L.) on the survival of sclerotia of S. cepivorum. Aqueous leek extract at concentrations of 50, 75 and 100% were placed in Petri dishes containing 50 sclerotia mixed with 10 g soil. Both the efficacy of the extract on sclerotia germination and the viability of recovered ungerminated sclerotia were determined after 30 and 60 days. Leek extract reduced the percentage of recovered sclerotia in all cases. Percentages of germinated sclerotia ranged from 32 to 38.5% and from 31.5% to 35.5% at 100% and 75% extract concentration respectively, at each of the two times studied. Lower values were obtained at 50% extract concentration. Viability of recovered sclerotia decreased between 66.5 and 54.5% at 100% extract concentrations and between 68.5 and 51.5% at 75% extract concentrations after 30 and 60 days, respectively. Sclerotial pathogen survival decreased by the germination stimulation and by the loss of viability after the application of the extracts.

Palabras clave : Leek extract; Control; Sclerotium cepivorum.

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