The Tiu, Henry II Wong, Elaine Son, Felipe Jr Villamor, Cyrus Blaine Peque, Janice Uy, Stanley Yase, Mary Ester Padilla, Paul Tremedal, Panfilo IV Wong, Sydney James Lumapas, Grace text monographic eng

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Joining the global effort of making our environment a better place to live in, the researchers of this study aim to determine the larvicidal effect of the Neem tree (Azadirachta indica) leaf and seed extracts on mosquito larvae. A comparison between the seed and leaf extract as to their effectivity is also done. The research was done in the hope of achieving cheap, effective and environment-friendly insecticide. In this study of the larvicidal effects of Neem tree leaf and seed extracts with different dilutions of 1:1, 1:2 and 1:5 are used on mosquito larvae exposed to the said extracts for different periods of time: 15 minutes, 30 minutes, 60 minutes and 120 minutes. Fresh Neem tree seeds and air-dried leaves are used as sources of the extracts. Method of extraction is by Dry-hand method. The mosquito larvae randomly collected and not taking into account their age, specie and breeding place. T-test for the significance of two proportions is the statistical method used for the analysis of the data. The base line dilution of 1:5 was used. After three replicates with a maximum period of two hours, results showed an increasing larvicidal effect as the concentration of the Neem extract from both seed and leaf is increased. For the positive control, a 100% larvicidal effect was observed 15 minutes after the time of application. For the negative control, a larvicidal effect of zero percent was obtained even 120 minutes after the time of application. Conclusions made base on the results of the study were: that extracts from Need seeds have greater larvicidal effects on mosquito larvae than extracts from Neem leaves; that 1:1 concentrations of both Neem tree leaf and seed extract produced the greatest larvicidal effect on mosquito larvae. Henry Tiu II [and ten others] Cebu Doctors' Proceedings, 1993 9 (2) pages 88-100 Azadirachta Larva Culicidae 210322 20210322143911.0 D0001J000272