Abstract
Mosquitoes are the most critical group of insects in the context of public health, since they transmit key parasites and pathogens, causing millions of deaths annually. Insecticides from natural products may boost the effectiveness of vector control programs. In this study, we tested silver nanoparticles (AgNPs) fabricated using the leaf extract of the orchid Zeuxine gracilis as reducing agent, and the microbial pesticide Bacillus sphaericus, against the mosquitoes Anopheles stephensi, Aedes aegypti and Culex quinquefasciatus. The synthesis of AgNP was confirmed analyzing the excitation of surface Plasmon resonance using ultraviolet–visible (UV–Vis) spectrophotometry. SEM and TEM showed the irregular shapes of AgNPs. EDX spectroscopy, FTIR spectroscopy, X-ray diffraction and dynamic light scattering analysis were carried out. AgNPs were highly effective against the larvae of An. stephensi (LC50 = 8.48 µg/mL), Ae. aegypti (LC50 = 10.39 µg/mL) and Cx. quinquefasciatus (LC50 = 13.21 µg/mL), respectively. Combined treatments testing B. sphaericus with AgNPs were also effective against An. stephensi (LC50 = 12.32 µg/mL), Ae. aegypti (LC50 = 14.78 µg/mL) and Cx. quinquefasciatus (LC50 = 19.19 µg/mL). Overall, this study suggests that the orchid-synthesized AgNPs can be a rapid, environmentally safer bio-pesticide to be used in synergy with B. sphaericus to control mosquito vectors.
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The authors are thankful to Science Engineering Research Board (SERB), Department of Science and Technology (DST), Govt. of India, New Delhi (PDF/2017/001581) for providing financial support for the present work.
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Kovendan, K., Chandramohan, B., Govindarajan, M. et al. Orchids as Sources of Novel Nanoinsecticides? Efficacy of Bacillus sphaericus and Zeuxine gracilis-Fabricated Silver Nanoparticles Against Dengue, Malaria and Filariasis Mosquito Vectors. J Clust Sci 29, 345–357 (2018). https://doi.org/10.1007/s10876-018-1331-4
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DOI: https://doi.org/10.1007/s10876-018-1331-4