Sensibilidade das espécies de Phytophthora a fungicidas in vitro
The response of Phytophthora capsici, P. palmivora and P. citrophthora to chemicals used in the control of cacao Phytophthora pod rot in Bahia was studied in vitro attempting to establish parameters to classify Phytophthora spp. present in cacao-growing areas of this state. The degrees of sensitivity of the species varied with the fungicides P. capsici and P. citrophthora were highly sensitive to Ridomil and Curzate CC showing 100 percent inhibition of mycelial growth at 25 ppm of the a.i. but their viability was not affected at this concentration. Similar results were obtained in relation to P. palmivora at 50 ppm of the same chemicals. P. citrophthora lost its viability at 50 ppm or more of the a.i. of Cobre Sandoz and Ridomil. Cobre Sandoz was also lethal to P. capsici in this concentration. However, P. palmivora lost its viability in vitro from 75 ppm of the a.i. and more of Cobre Sandoz, Curzate CC and Gafex. These species of Phytophthora were weakly sensitive to aliette. Its is concluded that the predominance of P. capsici in cacao-growing areas of Bahia is not due to a low sensitive of this species to the chemicals used to control cacao Phytophthora pod rot.
| Main Authors: | , , , |
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| Format: | biblioteca |
| Published: |
1984
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| Subjects: | THEOBROMA CACAO, PHYTOPHTHORA CAPSICI, PHYTOPHTHORA PALMIVORA, PHYTOPHTHORA CITROPHTHORA, ENFERMEDADES FUNGOSAS, FUNGICIDAS, PLAGUICIDAS, RESISTENCIA QUIMICA, COMPUESTO ORGANICO DEL COBRE, BAHIA, BRASIL, |
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| Summary: | The response of Phytophthora capsici, P. palmivora and P. citrophthora to chemicals used in the control of cacao Phytophthora pod rot in Bahia was studied in vitro attempting to establish parameters to classify Phytophthora spp. present in cacao-growing areas of this state. The degrees of sensitivity of the species varied with the fungicides P. capsici and P. citrophthora were highly sensitive to Ridomil and Curzate CC showing 100 percent inhibition of mycelial growth at 25 ppm of the a.i. but their viability was not affected at this concentration. Similar results were obtained in relation to P. palmivora at 50 ppm of the same chemicals. P. citrophthora lost its viability at 50 ppm or more of the a.i. of Cobre Sandoz and Ridomil. Cobre Sandoz was also lethal to P. capsici in this concentration. However, P. palmivora lost its viability in vitro from 75 ppm of the a.i. and more of Cobre Sandoz, Curzate CC and Gafex. These species of Phytophthora were weakly sensitive to aliette. Its is concluded that the predominance of P. capsici in cacao-growing areas of Bahia is not due to a low sensitive of this species to the chemicals used to control cacao Phytophthora pod rot. |
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