In vitro antifungal activity of several organic compounds against Ganoderma boninense

Abstract

Abstract Ganoderma boninense is the pathogenic fungi responsible for oil palm basal stem rot (BSR), one of the major diseases that can lead to plant death. Until recently, the most effective methods for controlling BSR disease were still in search. We tested several organic compounds that had the potential as fungicides for G. boninense, namely allicin, hesperidin, rutin, and polyphenol. The G. boninense used in this study was isolated from Bah Jambi, North Sumatra. The in vitro antifungal activity was tested using the media poisoning methods with 0.25%, 0.5%, 1%, 2%, and 4% concentrations with three replications. The growth capacity of treated G. boninense colonies was done using the Bavendamm test. The organic compounds showed different degrees of inhibition and increased with increasing concentration. Allicin was the most effective compound against G. boninense, with a 100% inhibition rate at the lowest concentration, followed by polyphenol. The G. boninense treated with allicin and polyphenol has neither grown nor produced a reddish-brown area underneath when reinoculated to a tannic acid-containing medium. This result indicates the treated inoculum has no growth capacity. Allicin and polyphenol showed high potential as active compounds of organic fungicide against G. boninense.