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Alternative control of grape rots by essential oils of two Eucalyptus species
Author(s) -
Pedrotti Carine,
Marcon Ângela Rossi,
Delamare Ana Paula Longaray,
Echeverrigaray Sérgio,
Silva Ribeiro Rute Terezinha,
Schwambach Joséli
Publication year - 2019
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.9936
Subject(s) - colletotrichum acutatum , botrytis cinerea , eucalyptus globulus , horticulture , citral , limonene , food science , botany , wine , eucalyptus , biology , mycelium , fermentation , antimicrobial , essential oil , chemistry , inoculation , microbiology and biotechnology
BACKGROUND Essential oils (EOs) are volatile natural compounds produced by plant secondary metabolism, and some of them exhibit antimicrobial activity. The objective of the present study was to determine the chemical composition the EOs of Eucalyptus staigeriana and Eucalyptus globulus , and their effect in vitro and in vivo against Botrytis cinerea and Colletotrichum acutatum , the most important fungal rot diseases of grapes. Moreover, grapes collected from field experiments were used to evaluate the impact of the alternative control on the alcoholic fermentation and wine composition. RESULTS The major compound of E. staigeriana EO were citral 30.91% (19.74% geranial, 11.17% neral), 1.8‐cineole (24.59%) and limonene (19.47%), while 1.8‐cineole represented 68.26% of E. globulus EO. The two EOs showed in vitro antifungal activity against both pathogens. Eucalyptus staigeriana EO exhibited the highest activity inhibiting mycelial growth (MG) and conidial germination at 0.5 μL mL −1 . Moreover, this EO was able to reduce the incidence and severity of grey rot caused by B. cinerea and the severity of ripe rot caused by C. acutatum The alternative control did not significantly influence alcoholic fermentation, the physicochemical characteristics, and the volatile composition of wines. CONCLUSION These results are promising and indicate that E. staigeriana EO might be further investigated as a natural alternative for the control of fungal rots on wine grapes. © 2019 Society of Chemical Industry