Larvicidal Activity of essential oils from Brazilian plants against Aedes aegypti L.

Larvicidal and irritant activities of hexane leaf extracts of Citrus sinensis against dengue vector Aedes aegypti L.

“…aegypti with hexane extracts of the leaves of C. sinensis resulted in 50% mortality at 446.84 ppm. This value is much higher than that obtained by Cavalcanti et al [15] who reported LC 50 value of 69 ppm but with essential oil extracted from Cymbopogon citratus against early fourth instars of Ae. aegypti.…”

“…The most remarkable response on exposure to leaf extract was observed in blood-fed mosquitoes with first flight only after 4 sec and an average total of 54.33 takeoffs as against only 5.00 take-offs against control (Table 2). Against unfed females though the extract was relatively less effective yet caused a significant number of 34.33 take-offs in just 15 min. The extract-impregnated paper was thus proved to be 7-11 times more irritable as compared with the control paper.…”

“…Our studies showed the significant irritancy potential of hexane extracts of Citrus leaves against the adults of Ae. aegypti as it caused 54.33 flights in blood-fed females and 34.33 flights in unfed females when exposed for just 15 min. The effect was, thus more pronounced in blood-fed females (10.86 irritability ratio) than unfed females (6.86 irritability ratio).…”

“…The adult was allowed to settle for 3 min after which the time taken for the first take-off was recorded. The experiment was continued for 15 min during which the total number of flights undertaken by the mosquito was scored.…”

“…Single female adult, 3-day old unfed/blood-fed, was released inside the funnel. After 3 min of acclimatization time, the time taken for the first take-off and total number of flights undertaken during 15 24 h of exposure. However, the extracts were proved to be remarkable irritant against adults Ae.…”