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19 October 2021 Avoidance Behavior to Guava Leaf Volatile Oil by Three Medically Important Mosquito Vectors
Pairpailin Jhaiaun, Amonrat Panthawong, Chutipong Sukkanon, Theeraphap Chareonviriyaphap
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Volatile organic compounds from various plants have received popular interest as one of the vector control tools due to their eco-friendliness and insect-repellent activities. In this study, an excito-repellency assay system was used to examine the noncontact repellency, contact excitation, and knockdown (KD) effects of guava leaf (Psidium guajava L.) oil against Anopheles minimus (Theobald), Anopheles epiroticus (Linton & Harbach), and Culex quinquefasciatus (Say). The organic components of guava oil were identified by gas chromatography–mass spectrometry analysis with DL-limonene (17.4%), cymene (5.49%), and α-terpinene (5.20%) as the major constituents. At concentrations of 2.5 and 5.0%, 100% escape of An. minimus was recorded in the contact assay and 96–98% escape in the noncontact assay. Guava oil stimulated potent irritant (92% escape) and repellent (61–86% escape) effects against Cx. quinquefasciatus. A lower repellency action was observed against An. epiroticus (17–20% escape). No KD effect was observed for guava oil against An. minimus and Cx. quinquefasciatus at any concentration. However, An. epiroticus was more prone to KD effects, with the highest percentage KD (44% in nonescape group) observed with 5.0% guava oil in the noncontact assay. Mortalities of 35% and 11% were observed for An. epiroticus in the nonescape groups in the contact and noncontact assays, respectively. Concentrations of 1.0% and 2.5% guava oil led to <2% mortality in An. minimus. Our findings highlight guava oil as a promising plant-based mosquito repellent that can be included in insecticide formulations for future mosquito control programs.

© The Author(s) 2021. Published by Oxford University Press on behalf of Entomological Society of America. All rights reserved. For permissions, please e-mail:
Pairpailin Jhaiaun, Amonrat Panthawong, Chutipong Sukkanon, and Theeraphap Chareonviriyaphap "Avoidance Behavior to Guava Leaf Volatile Oil by Three Medically Important Mosquito Vectors," Journal of Economic Entomology 114(6), 2534-2542, (19 October 2021).
Received: 2 July 2021; Accepted: 15 September 2021; Published: 19 October 2021

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Anopheles epiroticus
Anopheles minimus
Culex quinquefasciatus
Psidium guajava
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