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Ciencia e investigación agraria

On-line version ISSN 0718-1620

Abstract

HERRERA, Rodrigo et al. Sensitivity of wild-type and mutant Trichoderma harzianum strains tofungicides. Cienc. Inv. Agr. [online]. 2012, vol.39, n.3, pp.569-576. ISSN 0718-1620.  http://dx.doi.org/10.4067/S0718-16202012000300016.

The germination of conidia in wild-type (Th11, Th12 and Th650) and mutant (Th11A80.1, Th12A10.1 and Th650-NG7) strains of Trichoderma harzianum that were exposed to different commercial fungicides was studied. All wild-type and mutant Trichoderma strains were germinated in the presence of 1,700 mg L-1 of pencycuron. The wild-type strains Th12 and Th650 and the corresponding mutant strains Th12A10.1 and Th650-NG7 were sensitive to all concentrations of iprodione and metalaxil + mancozeb. The EC50 (Median Effective Concentration) values for the different fungicides were between 10-1 and 10-4 less than the concentrations recommended for field applications; one exception was Phyto-fos on Th650-NG7, where this ratio was 0.72. These results establish whether some of these fungicides can be used in combination with the biocontrol agents evaluated.

Keywords : biocontrol; biocontrol agents; control of tomato root diseases; fungicides; fungicide tolerant Trichoderma; integrated management.

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