Fumigant Toxicity and Repellence Activity of Camphor Essential Oil from Cinnamonum camphora Siebold Against Solenopsis invicta Workers (Hymenoptera:Formicidae).
Bottom Line: 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.
Affiliation: Key Laboratory of Natural Pesticide and Chemical Biology, Ministry of Education, South China Agricultural University, Guangzhou 510642, China.Show MeSH
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Mentions: The mortality of the ants is presented in Fig. 1. There were no workers found dead in the control groups. In all treatment groups, a noticeable variation of ant mortality was observed as the exposure interval was prolonged. A significant difference (F = 78.39, P < 0.0001) in the mortalities between minor and major workers was found; in particular, minor workers were more susceptible to camphor EO at 2.55 μg/ml concentration. An evident increase in mortality of workers was observed at different exposure times, in which the average mortality was 13.3–74.7% for the major workers and 20.0–100.0% for the minor workers. The highest average mortality percentage of the ants at 2.55 μg/ml was on 84.89% after 72 h.Fig. 1.
Affiliation: Key Laboratory of Natural Pesticide and Chemical Biology, Ministry of Education, South China Agricultural University, Guangzhou 510642, China.