Bio-activity of the essential oil of Syzygiumn aromaticum L against Dermestes maculatus DeGeer 1774 (Coleoptera: Dermestidae) infesting smoke-dried Clarias gariepinus Burchell 1822
Keywords:
C. gariepinus, D. maculatus, essential oil, infestation, pesticides, S. aromaticumAbstract
In this study, essential oil of S. aromaticum (EOSA) obtained by steam distillation using Clevenger apparatus was evaluated against Dermestes maculatus infesting smoke-dried C. gariepinus by residual contact method under laboratory conditions (26 ± 20C and 75 ± 5% RH). Four concentrations (2.5, 5, 7.5 and 10%) of EOSA were separately applied on fifteen grams of C. gariepinus. Newly (0 -24 hours) emerged adults and 3rd instar larvae of the pest were exposed to the treated samples for a period of 5 days. Results showed that 80% larval mortality was recorded in 7.5 and 10% concentrations of EOSA at 24 HAE, which increased to 70 – 100% with extending the exposure period to 48 hours in 5 – 10% concentrations. The essential oil resulted in 50 – 100% adult mortalities at 24 HAE. The LC50 of EOSA against adults D. maculatus was 2.72 and 1.80% at 24 and 48 hours, respectively, whereby the median lethal time (LT50) required by 5.0 and 7.5% concentrations of EOSA to kill 50% of the adult are; 17.15 and 10.94 hours respectively. Similarly, the LC50 of the EO against larvae of the pest were 4.87 and 3.14% with LT50 of 29.70 and 13.10 hours at the same period of time and concentrations. Oviposition, egg hatchability and adult emergence of D. maculatus were positively inhibited by EOSA. Therefore EOSA could be used as a protectant to smoke-dried C. gariepinus against the infestation of D. maculatus.
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