title: Fumigant Toxicity and Repellence Activity of Camphor Essential Oil from Cinnamonum camphora Siebold Against Solenopsis invicta Workers (Hymenoptera:Formicidae).
abstract: The red imported fire ant (RIFA) Solenopsis invicta Buren causes severe damage to humans and animals as well as the environment. Chemical treatment is the main strategy of RIFA management, which also is potentially toxic to the environment. Plant essential oils (EOs) are considered as potential substance that can be used to control insects. This study aimed to identify the chemical composition of camphor EO and investigate the insecticidal activity on RIFAs. The chemical composition of the EO was analyzed by gas chromatography/mass spectrometry and gas chromatography with flame ionization detection. Results revealed that 36.61% camphor and 30.05% cineole were the major components. The insecticidal activity of camphor EO was assessed against RIFA workers by conducting two different bioassays: fumigant toxicity and repellence. Fumigant toxicity assay results showed that the lethal dose (LC50) of the EO at 24 h was 1.67 and 4.28 μg/ml for minor and major workers, respectively; knockdown time (KT50) was 10.82 and 14.73 h. At 2.55 μg/ml, the highest average mortality of the ants was 84.89% after 72 h. Camphor EO exhibited fumigant toxicity against minor and major workers as indicated by the effects on attacking, feeding, and climbing behaviors. This EO was also strongly repellent to the two size workers of the colony as observed in their behavior against Tenebrio molitor treated with 5 µl EO. The fumigant toxicity and repellence of camphor EO against RIFA indicated that this substance could be a potential alternative for the development of eco-friendly products used to control pests.
authors.affiliation: Key Laboratory of Natural Pesticide and Chemical Biology, Ministry of Education, South China Agricultural University, Guangzhou 510642, China.
authors.forename: J T
authors.initials: JT
authors.lastname: Fu
authors.affiliation: Key Laboratory of Natural Pesticide and Chemical Biology, Ministry of Education, South China Agricultural University, Guangzhou 510642, China.
authors.forename: L
authors.initials: L
authors.lastname: Tang
authors.affiliation: Key Laboratory of Natural Pesticide and Chemical Biology, Ministry of Education, South China Agricultural University, Guangzhou 510642, China.
authors.forename: W S
authors.initials: WS
authors.lastname: Li
authors.affiliation: Key Laboratory of Natural Pesticide and Chemical Biology, Ministry of Education, South China Agricultural University, Guangzhou 510642, China.
authors.forename: K
authors.initials: K
authors.lastname: Wang
authors.affiliation: Key Laboratory of Natural Pesticide and Chemical Biology, Ministry of Education, South China Agricultural University, Guangzhou 510642, China Department of Plant Protection, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China.
authors.forename: D M
authors.initials: DM
authors.lastname: Cheng
authors.affiliation: Key Laboratory of Natural Pesticide and Chemical Biology, Ministry of Education, South China Agricultural University, Guangzhou 510642, China State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangzhou 510642, China zdsys@scau.edu.cn.
authors.forename: Z X
authors.initials: ZX
authors.lastname: Zhang
mesh_terms: D000818:Animals; D001000:Ants / Q000502:physiology*; D002164:Camphor; D003511:Cyclohexanols; D000077591:Eucalyptol; D007302:Insect Repellents; D007306:Insecticides; D039821:Monoterpenes; D009822:Oils, Volatile / Q000737:chemistry
chemical_list: D003511:Cyclohexanols; D007302:Insect Repellents; D007306:Insecticides; D039821:Monoterpenes; D009822:Oils, Volatile; D002164:Camphor; D000077591:Eucalyptol
keywords: Solenopsis invicta; camphor essential oil; fumigant; repellent