EFEKTIVITAS BEBERAPA KONSENTRASI EKSTRAK KULIT JENGKOL (Pithecellobium jiringa) DALAM MENGHAMBAT Cercospora sp. SECARA IN VITRO

Effectiveness of Several Concentrations of Jengkol Skin Extract (Pithecellobium jiringa) in Inhibiting Cercospora sp. In Vitro

Abstrak

Cercospora sp. is a pathogen that causes leaf spot disease in chili plants. The use of jengkol skin extract is one of the efforts to inhibit the growth of pathogens that cause Cercospora sp. disease because it has antifungal properties such as alkaloids, flavonoids, saponins, tannins and tripernoids. The research was conducted from July 2024 to September 2024 at the Laboratory of Pathology, Entomology, Microbiology, and Soil Science, Faculty of Agriculture and Animal Science, State Islamic University Sultan Syarif Kasim Riau. This study used an experimental method with a completely randomized design (CRD) with 6 concentration treatments of 0%, 1%, 2%, 3%, 4%, and 5%, each repeated 5 times. The observed parameters included phytochemical tests of jengkol skin extract, macroscopic characteristics of Cercospora sp., microscopic characteristics of Cercospora sp., growth rate (cm/day), and inhibition rate (%) of Cercospora sp. The results of the study showed that the administration of jengkol skin extract had a very significant effect on the growth rate, namely 0.10 cm/day and a concentration of 3% jengkol skin extract was effective in inhibiting the growth of Cercospora sp. colonies with an effectiveness percentage of (62,21.55%).