Abstract
R. Herrera, D. Nunez, N. Romero, X. Besoain, L. M. Perez, and J. Montealegre. 2012. Sensitivity of wild-type and mutant Trichoderma harzianum strains to fungicides. Cien. Inv. Agr. 39(3): 569-576. 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 EC 50 (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.
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