Fungitoxic properties of selected botanochemicals against wood destroying fungus (Polyporus cinnabarinus L.) in mangium (Acacia mangium Willd.)
1993
Lacandula, L.F.
Wood destroying fungus Polyporus cinnabarinus was known to have infected slash wood and cut logs of Acacia mangium which is expected to affect the quality of the final wood end-products. Evaluation of alternative botanochemical sources of fungicides as wood preservative was conducted through bio-assay in vitro and soil-block test using pure culture of P. cinnabarinus and the sample blocks of A. mangium. Ten plant species known to have fungicidal properties were collected and bio-assayed. Kamantigue (Impatiens balsamina L.), Calachuchi (Plumeria acuminata Ait.), and Luyang-dilaw (Curcuma longa L.) were finally selected based on their persistent inhibitory effects on the test fungus. The inherent fungicidal and antibiotic properties were attributed to the toxic chemical compounds present in these plants. Other species showed stimulatory effects. Further tests showed that dilution decreased the fungicidal actions of the botanochemicals. Different botanochemicals at varied concentrations significantly affected the percent weight loss and retention of test blocks indicative of their varied fungicidal actions. Concentrated solution of Kamantigue proved to be the most effective fungicide. However, the fungicidal actions of the botanochemicals were comparatively inferior than using standard wood preservatives. Also, percent weight loss was significantly correlated with retention in an inverse linear relationship. Furthermore, Polyporus cinnabarinus was found to degrade both lignin and cellulose in the carbohydrate-rich sapwood of Mangium
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