Effect of Kecombrang (Etlingera elatior) as Larvacide to Control Aedes aegypti (Diptera: Culicidae)

Kecombrang (Etlingera elatior) as an Indonesian forest plant (generally called kincung, kantan, honje, vanity, tamarind acid, sambuang, scale beetle, siantan, and kecicang), flowering terna, fruit, and its seeds of Zingebereaceae family which are used as vegetable ingredients spices and control of plant pests. Etlingera elatior consist of saponins plays role as an insecticide and larvicide. Saponins can reduce the surface tension of the mucous membrane of the larval digestive tract, so that the wall of the tract become corrosive. Flavonoids as inhibiting agent for the eating of insects and fungus those which attack them, impacting the looting genes in the nitrogen nodule bacteria. This research objective is to find the LC50 and LC90 of kecombrang as larvicidal of Aedes aegypti and to survey the insect associated with this plant species. The studies showed LC50 values of 0.053% of kecombrang extract is effective to the larvae of Ae. Aegypti. The survey conducted from June-July 2019 on two plots of kecombarang plantation in the forest edge of Mount Leuser National Park in Pamah Village, Semilir District, Langkat Regency to invent the types of insects by using 3 tools, namely sticky yellow trap, pit fall trap and malaise trap. According to observation results, there are 12 families of Diptera were found on E. elatior plantation.