Vol. 6, Issue 5, Part A (2019)

Author(s): Essa EE, Shaimaa AA Mo'men, Magda H Rady, Shireen AM Ma'moun, Emad MS Barakat and Mohamed S Salama

Abstract: The current study designed to evaluate the effect ofEucalyptusoil on nanoscale capsulated in chitosan beads against the larvae of Culex pipiens. This cross-linking was described by using scanning electron microscopy,X-ray Diffraction, and Fourier Transform Infrared spectroscopy techniques. Mortality percentages of non-encapsulated Eucalyptusoil against tested larvae at different time intervals were 72.51, 83.91, 88.20, 97.36, and 98.00%, respectively with lethal concentration (LC₅₀) 52.390, 42.934, 33.545, 26.291, and 20.301μL.While the mortality percentages at a time-dependent study using the continuous release from encapsulated beads of nano-Eucalyptus oil were 80, 91.67, 98.3, 99.31, and 99.56%, respectively with lethal concentrations (LC₅₀) 0.734, 0.637., 0.5, 0.453. and 0.419 mg/l. We observed that the increased mortality was proportional to the concentration of the nano-emulsion in the beads. The controlled release of nano oil from chitosan beads making persistence to the active materials up to 5days of exposure to the encapsulated beads compared with the non-encapsulated oil.The results proved that the encapsulated beads possess interesting larvicidal activity that makes it suitable for application in integrated vector control strategies.

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