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Biological control of avocado white root rot with combined applications of Trichoderma spp. and rhizobacteria

AuthorsRuano Rosa, David ; Cazorla, Francisco Manuel; Bonilla, Nuria; Martín-Pérez, R.; Vicente, Antonio de; López Herrera, Carlos
KeywordsRosellinia necatrix
Persea americana
Issue DateApr-2014
PublisherKluwer Academic Publishers
CitationEuropean Journal of Plant Pathology 138(4): 751-762 (2014)
AbstractThis study tested the effectiveness of single and combined applications of Trichoderma and rhizobacterial strains to control white root rot (WRR) caused by Rosellinia necatrix in avocado plants. Three Trichoderma, two T. atroviride and one T. virens monoconidal strains and four bacterial strains (Bacillus subtilis, Pseudomonas pseudoalcaligenes and two P. chlororaphis) were assayed to determine their compatibilities in vitro. In addition, the effects of the bacterial filtrates were evaluated against the Trichoderma strains and reciprocally; these filtrates were applied alone or in combination to determine their effectiveness against R. necatrix. Individual control agents or combinations of them were applied to avocado plants that were artificially inoculated with a virulent R. necatrix strain. Compatibility between the combined Trichoderma applications and the bacterial strains was observed and these combinations significantly improved the control of R. necatrix during the in vitro experiments. A relative protective effect of some Trichoderma and bacteria was observed on the control of avocado WRR when they were applied singly. The combinations of T. atroviride strains with bacterial strains P. chlororaphis and P. pseudoalcaligenes showed a better control of avocado WRR, whereas the rest of Trichoderma and bacteria combinations also reduced significantly the level of disease and induced a delay at the onset of disease with respect to avocado plants inoculated either with Trichoderma or bacteria. © 2013 KNPV.
Publisher version (URL)http://dx.doi.org/10.1007/s10658-013-0347-8
Identifiersdoi: 10.1007/s10658-013-0347-8
issn: 0929-1873
e-issn: 1573-8469
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