Preliminary evaluation of the larvicidal activity of extracts and fractions from Ocotea nutans (Nees) Mez against Aedes aegypti

Betim, Fernando César Martins; Oliveira, Camila Freitas de; Montrucchio, Deise Prehs; Miguel, Obdúlio Gomes; Miguel, Marílis Dallarmi; Maurer, Juliana Bello Baron; Dias, Josiane de Fátima Gaspari

doi:10.1590/0037-8682-0576-2020

Cited by 2 publications

(1 citation statement)

References 13 publications

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“…In further studies with the hexanic fraction of the crude extract of Ocotea nutans (Nees.) Mez stem conducted by Betim et al (2021), the results demonstrated a high potential to control L3 larvae, with LC of 50 14.14 µg/mL. Perewalo et al (2021) when evaluating the larvicidal activity of the alkaloid S-(+)-dicentrine extracted from galls of Ocotea puberula (Rich.)…”

Section: Discussionmentioning

confidence: 99%

Use of essential oils from plants of Araripe National Forest against Aedes aegypti (Diptera: Culicidae)

Azevedo,

Ferreira,

Leandro

et al. 2023

Braz. J. Biol.

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Aedes aegypti control is achieved with chemical insecticides that can promote insecticide resistance. In the search for new forms of control, the use of botanical products is currently growing and many tests with oils have already been performed. The plant diversity of Araripe National Forest enables the study of several species against this vector. To evaluate the larvicidal effect of essential oils from plants of this forest, we used field rosemary, copaiba, bay leaf, cashew and pequi. The work was divided into three stages: all oils with the same dosage; the best oil at dosages of 0, 5, 10, 20, 50 and 75 µg/mL; and the best dosage at temperatures of 15, 20, 25, 30 and 35 °C. The oils of field rosemary, copaiba, bay leaf, cashew and pequi were good insecticides when used at dosages above 5 μg/mL. The bay leaf oil showed high larvicidal activity at all dosages tested, showing the highest efficiency at 75 μg/mL. Temperatures of 15 and 35 °C increased the susceptibility of the insect to the effect of the bay leaf oil. The essential oils of field rosemary, copaiba, bay leaf, cashew and pequi, from Araripe National Forest, applied at a dosage of 5μg/mL, showed insecticidal action, although with low efficiency

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Section: Discussionmentioning

confidence: 99%

Use of essential oils from plants of Araripe National Forest against Aedes aegypti (Diptera: Culicidae)

Azevedo,

Ferreira,

Leandro

et al. 2023

Braz. J. Biol.

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Comparison of Mosquito Larvicidal Formulations of Diflubenzuron on Culex Pipiens Mosquitoes in Belgrade, Serbia

et al. 2022

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Culex mosquitos are important infectious diseases vectors in temperate and tropical regions of the World, affecting nearly 350 million people in both developed and developing countries. Our approach was to “recycle” the well-established larvicide, and by studying the tablets, pellets and granules as floating or sinking formulations, we found a method to optimise the use of diflubenzuron against Culex pipiens mosquitoes in field conditions. A standard WHO procedure was used to test the larvicide efficacy. The combined efficacy of all floating formulations was 10.7% higher than sinking preparations (p-value =0.002) and that maximised throughout the experiment on days 14 and 21, (p-values 0.012 and 0.008, respectively). All floating formulations kept their efficacies above 70% until day 21 of the experiment, while the mortality of sinking designs dropped significantly after day 14. The lowest efficacy was observed when sinking granules were used and the highest when floating tablets were applied in the canals. Only the floating tablets showed no significant changes in efficacy from day 1 to 21, but then that efficacy drops sharp until day 35. Since the larvae spend most of their time on the surface of the slow-moving waters to breathe, and floating pellets and tablets are made of materials that can serve as food sources, we conclude that these formulations have a higher efficacy, at least in conditions of non- or slow-moving waters. This study shows the importance of a systematic approach to reformulation of old, already proven and environmentally safe larvicides which can control the mosquito populations and their spreading of various pathogens.

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Preliminary evaluation of the larvicidal activity of extracts and fractions from Ocotea nutans (Nees) Mez against Aedes aegypti

Cited by 2 publications

References 13 publications

Use of essential oils from plants of Araripe National Forest against Aedes aegypti (Diptera: Culicidae)

Use of essential oils from plants of Araripe National Forest against Aedes aegypti (Diptera: Culicidae)

Comparison of Mosquito Larvicidal Formulations of Diflubenzuron on Culex Pipiens Mosquitoes in Belgrade, Serbia

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