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Twelve medicinal plants and a commercially used drug Ivermectin were examined for insecticidal activity against  Melophagus ovinus  sheep ked at different time intervals using  in vitro  adult immersion test. The findings show that at 3.13  µ L/mL, 6.25  µ L/mL and 12.5  µ L/mL concentration of  Cymbopogon citratus ,  Foeniculum vulgare  and  Eucalyptus globulus  essential oils respectively, recorded 100% mortalities against  M. ovinus  within 3 hour of exposure. Significantly higher insecticidal activity of essential oils was recorded ( P  = 0.00) when compared to 10   μ  g/mL Ivermectin after 3-hour exposure of  M. ovinus  at a concentration of ≥1.57   μ  L/mL, ≥3   μ  L/mL, and ≥12.7   μ  L/mL essential oils of  C. citratus ,  F. vulgare , and  E. globulus , respectively. Among essential oils,  C. citratus  has showed superior potency at a three-hour exposure of the parasite ( P  = 0.00) at a concentration of ≥0.78   μ  L/mL. Strong antiparasitic activity was recorded by aqueous extract of  Calpurnia aurea  (80% mortality) at a concentration of 200 mg/mL within 24 h among aqueous extracts of 9 medicinal plants. The results indicated all the four medicinal plants, particularly those tested essential oils, can be considered as potential candidates for biocontrol of  M. ovinus  sheep ked.

Insecticidal Activity of Some Traditionally Used Ethiopian Medicinal Plants against Sheep KedMelophagus ovinus