Use of macacaporanga essential oil in the alternative control of anthracnose in fruits of guava

Abstract

The high demand for agricultural pesticides is associated with serious environmental consequences.
Thus, vegetable oils and extracts have been outstanding for the alternative control
of phytopathogens. The objective of this work was to evaluate the effect of macacaporanga
(Aniba parviflora) essential oil on the fungus Colletotrichum gloeosporioides, causal agent of
anthracnose in guava. The essential oil was filtered and added in BDA medium to obtain the
concentrations: 0.10; 0.50; 1.25; 2.25 and 4.0 mg.mL-1. The medium was poured into Petri
dishes and after solidification, a disk of medium containing the phytopathogen structure was
deposited centrally. The control consisted of cultivating the fungus in medium without the presence
of oil. The percent inhibition of growth (PIC) of the fungus was evaluated. All concentrations,
except for 0.10 mg.mL-1, reduced the mycelial growth of the phytopathogen. The oil
showed a fungistatic effect at the lowest concentrations and fungicide at the highest concentration
tested.