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Electronic Journal of Biotechnology
Universidad Católica de Valparaíso
ISSN: 0717-3458
Vol. 8, No. 3, 2005, pp. 249-257
Bioline Code: ej05028
Full paper language: English
Document type: Research Article
Document available free of charge

Electronic Journal of Biotechnology, Vol. 8, No. 3, 2005, pp. 249-257

 en Biocontrol of root and crown rot in tomatoes under greenhouse conditions using Trichoderma harzianum check for this species in other resources and Paenibacillus lentimorbus check for this species in other resources . Additional effect of solarization
Montealegre, Jaime R.; Herrera, Rodrigo; Velásquez, Juan Carlos; Silva, Polyana; Besoaín, Ximena & Pérez, Luz María

Abstract

Trichoderma harzianum check for this species in other resources 650 (Th650) and Paenebacillus lentimorbus check for this species in other resources 629 (Pl629) selected earlier for their ability to control Rhizoctonia solani check for this species in other resources , Fusarium solani check for this species in other resources and F. oxysporum in vitro, were applied alone or combined with solarization (summer assay) and/or with methyl bromide (MeBr) (summer and winter assays) to a soil with a high inoculum level, for the control of tomato root rot caused by the complex F. oxysporum f. sp. lycopersici - Pyrenochaeta lycopersici check for this species in other resources - Rhizoctonia solani check for this species in other resources . Evaluations were also performed independently for root damage caused by P. lycopersici, and also for R. solani in the summer assay. MeBr decreased tomato root damage caused by the complex from 88.7% to 21.2% and from 78.4% to 35.7% in the summer and in the winter assay, respectively. None of the bio-controllers could replace MeBr in the winter assay, but Th650 and Pl629 reduced root damage caused by this complex in the summer assay. Treatments with bio-controllers were improved by their combination with solarization in this season. Independent evaluations showed that the positive control of Th650 towards R. solani and the lack of effect on P. lycopersici correlates well with the endochitinase pattern expressed by Th650 in response to these phytopathogens. Root damage caused by R. solani can be controlled at a similar level as it does MeBr in summer assays, thus representing an alternative to the use of this chemical fungicide for the control of this phytopathogen.

Keywords
Fusarium oxysporum, Lycopersicon esculentum, Pyrenochaeta lycopersici, Rhizoctonia solani, solarization.

 
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