Resumen

ORTIZ, Fredy; RODRIGUEZ, Dorian; SANABRIA, María E  y  PINEDA, Juan. Management of the late blight of celery (Apium graveolens  L. var. Dulce) using plant extracts under controlled conditions. Bioagro [online]. 2016, vol.28, n.2, pp.87-94. ISSN 1316-3361.

Late blight of celery, caused by the fungus Septoria apiicola is the most limiting foliar disease in this crop, especially in the highlands of Táchira State, Venezuela, where control with agrochemicals is not enough for reducing the disease incidence. This research focused on the evaluation of the effect of different concentrations of ethanolic extracts (EE) from Lippia origanoides (Lo) and Gliricidia sepium (Gs) leaves, on the pathogen conidia (in vitro) and disease management, either as preventive or curative treatment, on celery plants in growing chambers. Both, EE of Lo and Gs showed fungicidal effects on conidia at concentrations of 0.25 and 0.8 %, respectively, while in vivo, this effect was observed at treatments Lo 15 % and Gs 19 %.  Preventive  and curative treatments with Lo 15 % showed their potential use to reduce disease infection 44 and 47.4 %, respectively, while with Gs 19 % the reduction was 69.5 and 64.4 %, respectively. On the other hand, when using Gs 19 % a light phytoxicity effect and a hormesis phenomenon were observed in the plants.

Palabras clave : Secondary metabolites; Septoria apiicola.

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