Sensitivity of wild-type and mutant Trichoderma harzianum strains to fungicides

Rodrigo Herrera; David Núñez; Natalia Romero; Ximena Besoain; Luz María Pérez; Jaime Montealegre

doi:10.4067/S0718-16202012000300016

Sensitivity of wild-type and mutant Trichoderma harzianum strains to fungicides

Translated title of the contribution: Sensitivity of wild-type and mutant Trichoderma harzianum strains to fungicides

Rodrigo Herrera, David Núñez, Natalia Romero, Ximena Besoain, Luz María Pérez, Jaime Montealegre

SCHOOL OF AGRONOMY

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

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 wildtype 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.

Translated title of the contribution	Sensitivity of wild-type and mutant Trichoderma harzianum strains to fungicides
Original language	English
Pages (from-to)	569-576
Number of pages	8
Journal	Ciencia e Investigacion Agraria
Volume	39
Issue number	3
DOIs	https://doi.org/10.4067/S0718-16202012000300016
State	Published - Dec 2012

Keywords

Biocontrol
Biocontrol agents
Control of tomato root diseases
Fungicide tolerant Trichoderma
Fungicides
Integrated management

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abstract = "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 wildtype 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.",

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AU - Besoain, Ximena

AU - Pérez, Luz María

AU - Montealegre, Jaime

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AB - 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 wildtype 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.

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Sensitivity of wild-type and mutant Trichoderma harzianum strains to fungicides

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