Extrato de casca de café, óleo essencial de tomilho  e acibenzolar-S‑metil no manejo da cercosporiose-do-cafeeiro

Ricardo Borges Pereira; Eduardo Alves; Pedro Martins Ribeiro Júnior; Mário Lúcio Vilela de Resende; Gilvaine Ciavareli Lucas; Josimar Batista Ferreira

doi:10.1590/S1678-3921.pab2008.v43.787

Authors

Ricardo Borges Pereira Universidade Federal de Lavras
Eduardo Alves Universiadade Federal de Lavras
Pedro Martins Ribeiro Júnior Universidade Federal de Lavras
Mário Lúcio Vilela de Resende Universidade Federal de Lavras
Gilvaine Ciavareli Lucas Universidade Federal de Lavras
Josimar Batista Ferreira Universidade Federal do Acre

DOI:

https://doi.org/10.1590/S1678-3921.pab2008.v43.787

Keywords:

Cercospora coffeicola, Coffea arabica, resistance induction, scanning electron microscopy

Abstract

The objective of this work was to assess the effect of the coffee berry husk extract, thyme essential oil and acibenzolar-S-methyl on the germination and micelial growth and on in vivo development of Cercospora coffeicola, and to characterize their effi ciency as resistance inducers in coffee plants, and to determine the
peroxidase activity and lignin accumulation in tissues of coffee tree. The coffee berry husk extract presented no toxic effect on germination; however, it inhibited the mycelial growth proportionally to the increase of the concentrations. The thyme essential oil inhibited the germination and the mycelial growth with the increase of concentrations. Both coffee berry husk extract and acibenzolar-S-methyl neither affected the germination nor the development of germinative tubes, differently of thyme essential oil. Seedlings treated with acibenzolar- S-methyl, coffee berry husk extract and thyme essential oil presented peaks of peroxidase activity at 2nd and 11th, 7th and 11th and, 2nd and 9th days after treatment, respectively. The treatments did not differ in lignin
content. Coffee berry husk extract and acibenzolar-S-methyl induced resistance in coffee seedlings against C. coffeicola, and thyme essential oil presented toxic effect on the pathogen.