Microorganisms
The antagonistic B. subtilis ABS-S14 used in this investigation was isolated from soil collected from citrus groves around the south of Thailand. It was characterized by Gram staining, cell shape with presence of spores and bio-chemical identification, and its anti-fungal activity was screened on potato dextrose agar (PDA) plates (Sangwanich et al., 2013). B. subtilis was streaked on nutrient agar plates and incubated at 37◦C for 18 h before starting the experiments.