Lethal Time Ekstrak Bunga Kecombrang (Etlingera elatior) Terhadap Larva Aedes aegypti

Abstract

ABSTRACT
The control of the dengue hemorrhagic fever vector is essential. Through chemically, biology, and environmental modifications. Prolonged use of chemical insecticides may pose a vector-resistant risk. One alternative solution is to use larvacide derived from plants. This study aims to determine the mortality of a mosquito larva Ae. aegypti based on time or long exposure to lethal time (LT50 and LT90) the flower extract of the Kecombrang (etlingera elatior). The type of research used is true experimental, a large sample is determined based on the formula Federer thus obtained six treatment concentrations and four repetitions. Larvae mortality was observed every 1 hour, 3 hours, 6 hours, 9 hours, and 24 hours. Data analysis uses probit analysis and linear regression. The results showed a concentration of Kecombrang flower 0.75% (LT50 = 261.86 hours; LT90 = 3690.6 hours), concentration 1.0% (LT50 = 94.01 hours; LT90 = 2666.56 hours), concentration 1.25% (LT50 = 15.27 hours; LT90 = 246.25 hours), concentration 1.50% (LT50 = 11.53 hours; LT90 = 82.66 hours), concentration 1.75% (LT50 = 10 hours; LT90 = 62 hours), and 2.0% concentration (LT50 = 9.65 hours; LT90 = 27.18 hours). The higher the concentration of the Etlingera elatior flower extract, the less time it takes to kill the larvae ae. aegypti (LT50 and LT90). Etlingera Elatior flowers can be used as an alternative to Biolarvasida. 

Keywords : Lethal time, dengue hemorrhagic fever, larvae,  Aedes aegypti