Resumo

RIVERA-MENDEZ, William; ZUNIGA-VEGA, Claudia  e  BRENES-MADRIZ, Jaime. Biological control of fungus Sclerotium cepivorum using Trichoderma asperellum in garlic crops in Costa Rica. Tecnología en Marcha [online]. 2016, vol.29, suppl.3, pp.41-50. ISSN 0379-3982.  http://dx.doi.org/10.18845/tm.v29i7.2704.

In this paper, the effectiveness of the antagonist fungus Trichoderma asperellum, previously isolated and identified, was evaluated for control the causative agent of white rot of garlic and onion, Sclerotium cepivorum. For this, field trials were conducted in six experimental plots cultivated with garlic, where the initial inoculum of each plot was determined. Subsequently two different treatments were applied; one based on a spore suspension of T. asperellum with a concentration of 1,0X105spores/ ml. The other, was the traditional chemical control used by farmers, based on a mixture in equal parts of copper oxychloride (61.1%), Ftalamida- Carboxin- Captan (40%), Ziram (76%), and Tebuconazole (25%). Sclerotia concentration was evaluated every thirty days; also the total mortality in each treatment and plot was recorded. After data analysis the antagonist fungus has similar efficacy as the agrochemicals used. Besides the value of the determination of initial inoculums on the disease spread ant total mortality was confirmed.

Palavras-chave : Biological control; sclerotia; antagonism; white rot; initial inoculums.

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