Insecticidal Toxicity of Plant Extracts and Green Silver Nanoparticles against Aedes albopictus
Insecticidal Toxicity of Plant Extracts and Green Silver Nanoparticles against Aedes albopictus
Hassan Shahzad Khan1, Muhammad Tariq1*, Tariq Mukhtar2 and Asim Gulzar1
ABSTRACT
Aedes albopictus is a known vector of many diseases such as Dengue, Chikungunya, Zika and Yellow fever. Many control measures have been adopted to manage the vector of these diseases. The excessive use of insecticides has led to development of resistance in Aedes albopictus and negative impact on the environment and non-target organisms. To overcome these problems, emphasis is being laid for alternatives such as biopesticides which are environmental friendly and economical. Therefore, in the present study, the toxicity of eight plant extracts and their green synthesized nanoparticles was evaluated against A. albopictus. The maximum mortality of 88% of 3rd instar larvae of A. albopictus was caused by datura extract followed by neem and clove. On the other hand, neem and clove extracts caused the maximum mortality (80%) of 4th instar larvae followed by datura extract (78%). Similarly, the minimum mortalities of 3rd and 4th instar larvae were caused by bitter gourd extract. In case of green silver nanoparticles, the maximum mortalities of 3rd and 4th instar larvae of A. albopictus were caused by neem and clove followed by datura, ginger and bakain. All the green silver nanoparticles caused above 80% mortality of both the instars of the mosquito. Bakain and neem extracts showed the minimum LC50 values after 72 h of application followed by garlic against the 3rd instar A. albopictus larvae. In case of green synthesized silver nanoparticles, the minimum LC50 values after 72 h were recorded with neem, bakain and garlic while the values were maximum in the case of clove, bitter gourd and datura. Similar trend of LC50 values was observed in case of 4th instar larvae. The LC50 values decreased with an increase in the time. It is concluded that the artificially synthesized Ag-nanoparticles can be used as environmental friendly alternative insecticide for the management of A. albopictus.
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December 2021
Vol. 53, Iss. 6, Pages 2001-2521
