Insecticidal Potential of Citrus and Mango Essential Oils and Selected Constituents on Silverleaf Whitefly1

Abstract

Bemisia tabaci is a cosmopolitan pest responsible for causing harm to crops in the agricultural hub of Petrolina in the state of Pernambuco, Brazil. We investigated the lethal and sublethal effects of vapors from essential oils obtained through hydrodistillation of the peels of four species of Citrus and the latex from Mangifera indica (var. “rosa” and “espada”) on B. tabaci. The chemical analysis by Gas chromatography coupled to mass spectrometry of the oils led to the identification of 71 constituents, with limonene as the major component of the Citrus oils and terpinolene as the major component of the M. indica oils. B. tabaci was more susceptible to Citrus aurantiifolia (LC50 = 0.70 µL L-1 air) and C. limon (LC50 = 1.77 µL L-1 air) oils, which had the same level of toxicity. Citrus and M. indica oils also led to a reduction in the fecundity of the pest. The lethal and sublethal action of the constituents linalool, α-terpineol, α-pinene, β-pinene, terpinolene and limonene is also discussed. The toxicity of the oils investigated herein associated with the reduction in fecundity is a considerable advantage in the management of B. tabaci. However, for practical use of these oils as a novel insecticide to proceed, further research is required to address safety issues for human health and determine the formulation to improve the insecticidal potency, stability and cost-benefit ratio.

Acaricidal properties of the selected components, blends and essential oils of species of genus Protium (Burseraceae) against Tetranychus urticae (Acari: Tetranychidae)

“…Particularly, in the state of Pernambuco, a significant number of plants produce essential oils, but little is known regarding their acaricidal potential. Previous investigations of essential oils from plants that occur in the Atlantic Forest biome have revealed significant properties acting through different pathways for the control of a range of arthropods (Neves & Câmara 2016;Moraes et al 2017;Ribeiro et al 2020;Silva et al 2020).…”