title: Insecticidal activity against Bemisia tabaci biotype B of peel essential oil of Citrus sinensis var. pear and Citrus aurantium cultivated in northeast Brazil.
abstract: The fumigant action of peel essential oils of Citrus sinensis var. pear (pear orange = PO) and C. aurantium (bitter orange = BO) from the northeast of Brazil were evaluated against Bemisia tabaci biotype B and compared with eugenol as a positive control. The oil concentration in the PO at 8.5 microL/L of air caused 97% mortality, while the oil concentration of BO at 9.5 microL/L of air caused 99% mortality. However, the LC50 estimates for both oils (LC50 = 3.80 microL/L of air for PO and LC50 = 5.80 microL/L of air for BO) did not differ from each other, but they did when compared with eugenol (LC50 = 0.20 microL/L of air). Regarding their effects on oviposition, the Citrus oils showed concentration-response dependence, reducing the number of eggs as the concentration increased, which was not observed for eugenol. The minimum concentrations of the oils that caused a significant reduction in the egg lay were 3.5 and 7.0 microL/L of air for BO and PO, respectively. These results suggest that oils from PO and BO peels may be promising as models to develop new insecticides that might be applied into the integrated management of whiteflies.
authors.affiliation: Programa de Pós-Graduação em Entomologia Agricola, Departamento de Agronomia, Universidade Federal Rural de Pernambuco 52171-900, Recife PE, Brazil.
authors.forename: Nicolle de Carvalho
authors.initials: Nde C
authors.lastname: Ribeiro
authors.forename: Claudio Augusto Gomes
authors.initials: CA
authors.lastname: da Camara
authors.forename: Flávia de Souza
authors.initials: Fde S
authors.lastname: Born
authors.forename: Herbert Alvaro Abreu
authors.initials: HA
authors.lastname: de Siqueira
mesh_terms: D000818:Animals; D001938:Brazil; D002957:Citrus / Q000737:chemistry*; D005638:Fruit / Q000737:chemistry*; D006430:Hemiptera / Q000187:drug effects*; D007306:Insecticides / Q000737:chemistry / Q000494:pharmacology*; D009822:Oils, Volatile / Q000737:chemistry / Q000494:pharmacology*; D010938:Plant Oils / Q000737:chemistry / Q000494:pharmacology*
chemical_list: D007306:Insecticides; D009822:Oils, Volatile; D010938:Plant Oils