UJI EFEKTIVITAS EKSTRAK KULIT BATANG POHON PULAI (Alstonia scholaris L. R. Br.) SEBAGAI BIOLARVASIDA NYAMUK Aedes aegypti YANG DIMANFAATKAN SEBAGAI SUMBER BELAJAR BIOLOGI

Dengue Hemorrhagic Fever (DHF) is one of the public health problems especially in Indonesia caused by mosquitoes. Mosquito control used today is an insecticide from the carbamate, peritroid, organophosphate and organoclorin, because it is considered effective, quickly knows the results and without seeing the environmental impact, it is deemed necessary to look for environmentally friendly plant insecticides, easy to find and effectively kill larvae that transmit dengue fever, In this study, Pulai (Alstonia scholaris L. R. Br) plants as plant biolarvasides are considered to have the killing power of dengue mosquito infectious mosquitoes based on literature and society, while the way to obtain active ingredients in the form of flavonoids, saponins and tannins is by extraction and distillation. From the results of LC50 using Probit analysis it appears that the extract of the bark of the Pulai tree (Alstonia scholaris LR Br) which caused the death of 50% of the test larvae of the total treatment was 2.413%, the value is in accordance with WHO standards ie the maximum concentration that can cause death of 50% Test larvae by 1%. This shows that the extract of bark (Alstonia scholaris L. R. Br) bark is effective as larvae of Aedes aegypti mosquitoes. The results of this research are used as a study of high school class X Biology learning resources