âFormulaÃÃes de extratos vegetais e micronutrientes na induÃÃo de resistÃncia em mudas de cafeeiro contra Cercospora coffeicolaâ, / Formulations of vegetal extracts and micronutrients for the induction of resistance of coffee seedlings against Cercospora coffeicola.

AUTOR(ES)

Daniel Rufino Amaral

DATA DE PUBLICAÇÃO

2008

RESUMO

The current work was aimed at evaluating the effect of different formulations based on plant extracts, in mixture or in combination with the compounds ASM (acibenzolar-S-methyl), copper sulfate, manganese sulfate or manganese chloride, in the severity of brown eye spot and on the number of leaves of coffee seedlings. Biochemical mechanisms involved in the defense response against C. coffeicola were also evaluated. All the treatments were applied by foliar spraying, seven days before inoculation with C. Coffeicola. It was verified that the treatments with pyraclostobin + epoxiconazole, ASM, EFID and EFID+ASM (in the first experiment), ViÃa CafÃÂ and NEFID (two applications) (in the second experiment); copper phosphite, the mixture of EFID with copper and EFID separately (in the third and fourth experiments); copper phosphite, the formulation EFID, the mixture of EFID with manganese sulfate (0,29 g/L) and EFID with manganese chloride (0,435 g/L) (in the fifth and sixth experiments) had provided higher protection against the disease and increase at the numbers of leaves when compared to the inoculated control. The activities of peroxidase, quitinase and beta-1,3-glucanase were higher for samples collected later in time, from 7 to 21 days after spraying. The exception was for β 1, 3-glucanase, which activity increased in the first hours, for the treatments with ASM and NEFID. The highest content of total phenolics was detected 11 days after spraying. The area under total phenolic content curve was significantly higher for treatments with EFID and NEFID in relation to ASM and controls.

ASSUNTO(S)

proteins pr fitopatologia micronutrientes pr proteÃnas extracts induction of resistance micronutrients brown eye spot coffea arabica cercosporiose extratos coffea arabica induÃÃo de resistÃncia

Documentos Relacionados

• RIBEIRO JÃNIOR, Pedro Martins. Phosphites for the protection and induction of resistance in coffee plants against Hemileia vastatrix and Cercospora coffeicola. 2008. 105p. Thesis (Doctorate in Phytopathology) â Federal University of Lavras, Lavras.
• InduÃÃo de resistÃncia a insetos-praga pela aplicaÃÃo de silÃcio em plantas de batata inglesa cultivada em sistema orgÃnico.
• Silicato de potássio na proteção do cafeeiro contra Cercospora coffeicola
• Phosphite on the growth, phosphate nutrition and aspects of the induction of resistance in maize.
• Aspectos histolÃgicos e bioquÃmicos da induÃÃo de resistÃncia em feijoeiro e atividade antifÃngica por derivados de Pycnoporus sanguineus