Assays of physical stability and insecticidal activity of leaf extract of Gliricidia sepium on Pseudococcus longispinus—mealybugs infecting rose apple
Department of Biology, Faculty of Math and Sciences, University of Lampung, Bandar Lampung, Indonesia.
Research Article
Open Access Research Journal of Life Sciences, 2022, 04(02), 025–030.
Article DOI: 10.53022/oarjls.2022.4.2.0072
Publication history:
Received on 21 September 2022; revised on 25 October 2022; accepted on 28 October 2022
Abstract:
This experiment is a follow-up study of our efforts to develop gamal plant (Gliricidia sepium) as natural insecticides. The purpose of this study was to determine the stability of the physical properties and the toxic activity of the extract that had been stored for up to three years. There were two types of extract prepared, namely water and methanol. Physical profile of the extract was assessed using organoleptic and pH of the extract. Meanwhile, the stability of the toxic properties was tested using residual effect techniques and probit analysis to determine the LC50 value of the extract. An overview of the study results obtained is as follows. The organoleptic properties and pH value of the gamal leaf extract remained stable for two years of storage. While the toxicity of the extract remained unchanged for 3 years of storage. Thus, it can be concluded that the leaf extract of the gamal plant has the potential to be developed into a plant-derived insecticide.
Keywords:
Kutu Putih; Mealybug; Psedococcus longispinus; Gamal; Gliricidia sepium; Extract Stability
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