Abstract
Ganoderma spp. is the main pathogen that is commonly found in oil palm plantations, which is known to cause stem rot and top stem rot disease. Many control techniques have been carried out, but there are still few that use salicylic acid suppression techniques on oil palm seedlings to inhibit the development of Ganoderma spp. This study aimed to examine the inhibitory ability of Ganoderma spp. using salicylic acid in vitro. This research was conducted descriptively with several concentrations of salicylic acid, namely 50 ppm (A1), 100 ppm (A2), 150 ppm (A3) and 200 ppm (A4) against Ganoderma sp. isolates LPTUNRI-Gan001 and LPTUNRI-Ga003. The aplication of 50 and 100 ppm salicylic acid was able to inhibit the growth of Ganoderma sp. isolate LPTUNRI-Gan001 by 100% and Ganoderma sp. isolate LPTUNRI-Gan003 by 100% after application of 50, 100 and 150 ppm. The application of 100-200 ppm salicylic acid can increase the height and number of leaves of oil palm seedlings. The application of 50-200 ppm salicylic acid can increase the total chlorophyll content.
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