UJI SINERGITAS EKSTRAK DAUN GAMBIR (Uncaria gambir Roxb) DAN DAUN MIMBA (Azadirachta indica) SEBAGAI BIOINSEKTISIDA DALAM MENGENDALIKAN HAMA KUMBANG KOKSI (Epilachna admirabilis)

OKTARINA, AYU TRIANI and Kamal, Mustafa (2025) UJI SINERGITAS EKSTRAK DAUN GAMBIR (Uncaria gambir Roxb) DAN DAUN MIMBA (Azadirachta indica) SEBAGAI BIOINSEKTISIDA DALAM MENGENDALIKAN HAMA KUMBANG KOKSI (Epilachna admirabilis). Undergraduate thesis, Sriwijaya University.

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Abstract

Epilachna admirabilis pests are a threat to horticultural crops, while chemical insecticides can cause resistance, environmental pollution, and health risks. A more environmentally friendly alternative is plant-based bioinsecticides, such as gambir and neem extracts, which contain active compounds catechins, tannins, and azadirachtin. This study aims to test the effectiveness of gambier and neem extracts against koksi beetles, compare their effectiveness, and analyze the synergistic effect of their combination. This research was conducted from October to December 2024 at the Genetics and Biotechnology Laboratory, Department of Biology, FMIPA, Sriwijaya University. With the method of complete randomized design (RAL). Extraction of gambier and neem leaves was carried out by maceration method using methanol, then tested by direct contact method on koksi beetles. Treatments included single extract (0.5%, 1%, 2%) and combination (1:1, 2:1, 1:2). Data were analyzed using ANOVA, Duncan test, and probit analysis to determine LC50. The results showed that the combination of gambier and neem extracts had a synergistic effect in increasing the mortality of koksi beetles. The combination of 1:1 ratio produced the highest mortality (85% in 72 hours), higher than the single extract of gambier (76%) and neem (64%). The LC50 value showed that gambier extract was more toxic than neem, while the combination of extracts had a lower LC50 than the single extract, indicating increased effectiveness. The Index of Coefficient of Synergy (ICS) > 1 confirmed the synergistic effect of the extract combination. These results suggest that the combination of gambier and neem extracts is more effective as a natural bioinsecticide than single extracts, offering an environmentally friendly solution for agricultural pest control. Further research is needed to test its effectiveness in the field as well as its impact on non-target organisms.

Item Type:	Thesis (Undergraduate)
Uncontrolled Keywords:	Kumbang koksi (Epilachna admirabilis), LC50, Sinergi ekstrak, Uncaria gambir Roxb, Azadirachta indica
Subjects:	Q Science > QH Natural history > QH301 Biology
Divisions:	08-Faculty of Mathematics and Natural Science > 46201-Biology (S1)
Depositing User:	Ayu triani Oktarina
Date Deposited:	19 Mar 2025 14:09
Last Modified:	19 Mar 2025 14:09
URI:	http://repository.unsri.ac.id/id/eprint/169435

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