Bioactivity of teak (Tectona grandis L.f.) and cajeput (Melaleuca cajuputi Powell) leaf extracted on inhibition fruit fungal pathogens

Abstract

Results showed that cajeput oil at 10,000 ppm had the highest inhibitory effect on the mycelial growth of all tested fungi, with an inhibition rate of 92.5%. It was followed by cajeput crude extract at 20,000 ppm and teak crude extract at 25,000 ppm, with inhibition rates of 88.6% and 67.0%, respectively. Thus, cajeput oil and cajeput extract showed promising potential in controlling fruit fungal pathogens. Effective concentration (EC50 and EC90) of each extract suggested that the lowest concentration to inhibit mycelial growth, spore germination and spore formation were in between 50-90%, which the concentration range between 100 to 30,000 ppm depending on the extracts and pathogen species. This finding could be useful in evaluating the appropriate concentration of each extract for controlling plant pathogenic fungi.