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The efficacy of nine essential oils were investigated
in vitro on conidial germination and mycelial growth inhibition
of Colletotrichum gloeosporioides isolate from papaya (Carica
papaya L.). In general, better antifungal effect was observed
with Cinnamomum zeylanicum and Syzygium aromaticum oils
which had strong inhibition of conidial germination of C.gloeosporioides
at 50, 100, 150, 200 and 250 μg mL-1 and a dose dependent
inhibition mycelial growth was caused by these oils. Teloxys ambrosioides,
Mentha piperita and Ruta chalepensis oils exhibited a moderate
action at 150, 200 and 250 μg mL-1 on conidial germination
and mycelial growth inhibition. Allium sativum, Citrus aurantifolia
and Eucalyptus globulus oils had no antifungal activity at different
concentration. Taking into account the in vitro results, C.
zeylanicum and S. aromaticum oils were evaluated on papaya
fruit during storage at ambient temperature and 14°C. The lowest infection
percentage were for papaya fruits treated with S. aromaticum at
50 μg mL-1 at both temperature tested, nevertheless did
not overcome the activity of synthetic fungicide. After storage at both
temperature, values of Soluble Solids Content (SSC) was not significantly
different. S. aromaticum oils may be a possibility to control C.
gloeosporioides of papaya fruit.
