Mosquitocidal and repellent activities of essential oils againstCulex pipiensL.

Abstract

Plants are a prospective source of novel natural insect repellents and botanical insecticides. This study was conducted to investigate the chemical composition of the essential oils of three plants growing in Saudi Arabia, namely Ducrosia anethifolia, Achillea fragrantissima, and Teucrium polium; and to evaluate their potential mosquitocidal and repellent activities against adult female Culex pipiens L. The main components of the three oils were found to be decanal (28.9%) and chrysanthenyl acetate (10.04%), (D. anethifolia); sabinyl acetate (35.79) and artemesia ketone (18.28%) (A. fragrantissima); α‐cadinol (49.53%) and δ‐cadinene (10.23%) (T. polium). The oil of A. fragrantissima was the most toxic (LC50 = 0.11 μL/L air) followed by D. anethifolia and T. polium with LC50 values of 5.22 and 25.98 μL/L air, respectively. T. polium oil was the most repellent (292 min at 2 μL/cm2), followed by D. anethifolia and A. fragrantissima. The results indicate that the essential oils have a potential fumigant insecticidal and repellent activities for mosquito control.

A Review of the Phytochemistry, Traditional Uses and Biological Activities of the Essential Oils of Genus Teucrium

“…This larvicidal effect was associated to the reduction of the digestive enzymes activity, in particular, α-amylase, triacylglycerol lipase, general protease, serine proteases (trypsin and chymotrypsin-like), carboxypeptidases, and aminopeptidases. Another study about this species concerns the use of its EO as both a mosquitocidal and repellent agent against Culex pipiens L. [252]. The oil was moderately toxic with LC 50 of approximately 25 µL/L and showed a better repellency of 292 min of protection at 2 µL/cm 2 .…”

Ducrosia spp., Rare Plants with Promising Phytochemical and Pharmacological Characteristics: An Updated Review

“…Dodecanal was found in almost all the studied species, and it is the second major EO compound, with the highest amount detected in the fresh flowers of the EO of a Jordanian D. flabellifolia sample (33.41%) [ 13 ]. cis -Chrysanthenyl acetate (3.2‒72.28%) was characterized in D. anethifolia [ 43 , 44 , 45 , 47 , 58 , 59 ] and D. assadii [ 14 , 39 , 40 ]; furthermore, α-pinene as a monoterpene hydrocarbon was identified in all the species, with highest and lowest amounts in the leaves of D. anethifolia (70.3%) [ 15 ] and D. assadii ’s aerial parts (4.0%), respectively [ 14 ]. The chemical structures of the main volatile compounds of the Ducrosia genus are displayed in Figure 2 .…”

“…Linear furanocoumarins have been previously identified as the major non-volatile components of the Ducrosia genus [2], whilst the main most volatile constituents were aliphatic hydrocarbons, with decanal (10.1-74.0%) [8,13,14,18,19,26,[38][39][40][41][42][43][44][45][46][47] and dodecanal (7.2-33.41%) as the major constituents [8,13,14,19,26,39,[41][42][43]45,46].…”

Biosynthesis of Lemongrass Essential Oil and the Underlying Mechanism for Its Insecticidal Activity

“…Essential oils have played a key role in the management of various insects of economic importance including pests, mites, mosquitoes and aphids (Feroz, 2020;Huong et al, 2019). Essential oils (EOs) are the volatile mixture extracted from various plant species which have cytotoxic potential and can be exploited as insecticides (Al-Sarar et al, 2020;. Along with cytotoxicity, EOs are attributed to cause neurological damages and organ-failure in target organisms (Afify et al, 2019).…”

“…However, percentage abundance of these constituents can vary depending on the geography, temperature, plant developmental stage, method used for essential oil extraction as well as the solvent used for the extraction (Muturi et al, 2020). Given such dynamic composition, different responses or varying severity of such responses against the same insect can be exhibited by the essential oils (Al-Sarar et al, 2020). (Figure 5)…”