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Investigación Agraria

On-line version ISSN 2305-0683

Abstract

CHAVEZ, Alice Rocío  and  AQUINO JARA, Alicia Susana. Control of soil fungi Rhizoctonia sp., Fusarium sp. and Sclerotium sp. with plant extracts. Investig. Agrar. [online]. 2012, vol.14, n.1, pp.17-23. ISSN 2305-0683.

In the laboratory and Greenhouse of the Plant Protection Department of the protection of the Faculty of Agricultural Sciences of the National University of Asunción, there were evaluated extracts of garlic (Allium sativum), Cyperus spp., Eryngium elegans and Urtica dioica to control fungi Rhizoctonia sp, Fusarium sp. and Sclerotium sp., using a completely randomized experimental design with five treatments and ten replicates. The extracts were obtained separately, blending the leaves of plants and bulbs of garlic, then filtered and incorporated into the PDA 20% culture medium and distributed in Petri dishes. Then, it was added in the center of the plates a disk of 4 mm in diameter with a pure culture of each fungus and incubated at 28 °C. There were evaluated: mycelial growth, sporulation and production of sclerotia of fungi. The results demonstrate that garlic extract inhibited mycelial growth of the three fungi, and sporulation of Fusarium sp. and sclerotia production of Sclerotium sp. In the greenhouse, seeds were sown in substrate inoculated with the fungus and the extracts were applied from planting to 20 days by watering, the incidence of Damping off was evaluated. The results indicated that the extracts do not control the disease. It is concluded that none of the extracts was efficient for the control of Damping off.

Keywords : Plant extractos,; alternative control; soil bome fungi.

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