Abstract
The repellent and adulticidal activities were analyzed for ethanol extract of Halophila ovalis against Culex quinquefasciatus (Cx. quinquefasciatus). The extraction was done in soxhlet apparatus using ethanol as solvent. The repellent activity of the Halophila ovalis was determined against Culex quinquefasciatus in different concentration of the extract at 100, 150, 200, 250 and 300 μL/cm2. Adulticidal activity of the Halophila ovalis extract was tested against four to five day old female adults of Culex quinquefasciatus. The adult mortality was observed 24h under the laboratory conditions. Each experiment was conducted with the three replicates and a concurrent control group. As per the WHO guidelines, the experiments were conducted. At 250 μL of concentration extracts of Halophila ovalis showed maximum repellency percentage of 95% against Culex quinquefasciatus. The highest adulticidal activity was observed in 100 μL concentration against Culex quinquefasciatus with LC50 were (50.2 ± 0.7) μL/ml and (51.2 ± 0.9) μL/ml. The GC-MS reveals unique chemical compounds obtained from the extract of Halophila ovalis. The present study identifies the active insecticidal compounds from Halophila ovalis by GC-MS and from the results it can be concluded the extract of Halophila ovalis can be novel efficient biocontrol source against filariasis mosquitoes.
Highlights
Mosquito vectors are essential for understanding vector-borne disease transmission dynamics among human populations because patterns of genetic structure and pathogen transfer through vector populations [1, 2]
The in a progress study have tested with marine seagrass extract of Halophila ovalis (Figure 1) against the vector borne disease causing mosquito like Culex quinquefasciatus
Halophila ovalis showed the maximum percentage of showed protection percentage of Culex quinquefasciatus mosquito protection (95) and protection time (4.4 hrs) was observed at the 250 μL of Halophila ovalis extract
Summary
Mosquito vectors are essential for understanding vector-borne disease transmission dynamics among human populations because patterns of genetic structure and pathogen transfer through vector populations [1, 2]. The mosquito control continues to be an important strategy in preventing the mosquito-borne diseases [5]. In view of the residue problems in the environment and development of insect resistance to synthetic insecticides like DDT and chlorinated hydrocarbons [10]. Various surveys have shown that seaweeds are an excellent source of constituents such as polysaccharides, tannins, flavonoids, phenolic acids, bromophenols, carotenoids and exhibited different biological activities [16]. The objective of this present study was to evaluate larvicidal, repellent and adulticidal activities of Halophila ovalis extracts against Culex quinquefasciatus
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