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Summary The acaricidal activity of ethanol and petroleum ether extracts from the leaves of Ambrosia maritima (Asteracae) were tested against unfed larvae and adult Hyalomma anatolicum ticks using the packet and dipping test, respectively. Both extracts showed larvicidal activities. The probit values of LC50 and LC99 for the ethanol and petroleum ether extracts of larvae and adults were 0.11%and 13.65% and 5.85% and 14.47%,. respectively. Although the different concentrations of both extracts had not killed the exposed flat adult ticks, they altered their attachment, feeding process, and the reproduction performance of those females who had succeeded to feed. The calculated concentrations that induced 50% or 100% inhibition of feeding were 10.9% and 20.5% for the ethanol extract and 0.39% and 14.9% for the petroleum ether extract. Both extracts found to decrease the hatchability of eggs produced by treated females. The calculated concentration of the ethanol and petroleum ether extracts that caused 50% and 100% inhibition of reproduction (I.R) were 23.9% and 53.5%and 11.9% and 28.5%, respectively. This is the first detailed report on the acaricidal activity of ethanol and petroleum ether extracts obtained from A. maritima leaves against H. anatolicum. The results indicated that both plant extracts could act as larvicides and growth inhibitor agents, so the plant A. maritima can be considered to be a potential acaricide for biocontrol of H. anatolicum in the field.

 
 
   
 
 

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