Myiasis in sheep farms in Riyadh region, Saudi Arabia

During a survey for myiasis in Riyadh Region, 3712 sheep were examined. Seventy-three animals were infested with different dipterous larvae. Out of the 115 recovered larvae, 100 larvae were recovered from Chrysomya bezziana, 10 were C. Albiceps and 5 were Wohlfahrtia nuba. The prevalence rate of larval myiasis among young sheep was 60% and 40% among adults. The myiasis incidences were highest during the period from March to May [60%] and from September to November [31.5%], where temperature and RH were optimum. In the dry hot season [June-August] and cold season [December-February], infestation incidences were low [5% and 1.5%, respectively]. Temperature and RH are conductive in controlling myiasis in other regions of the Kingdom

Efficacy of flumethrin and coumaphos against the camel tick Hyalomma dromedarial L. [Acari: ixodidae]

The efficacy of Flumethrin pour on and Coumaphos 50% WP was tested against different stages of Hyalomma dromedarii. With contact method, LC[50] values for larvae and adults were 0.04, 0.03 ug/cm[2] and 0.05, 1.06 ug/cm[2] respectively. The LC[50] for coumaphos against the larvae, adults and eggs using dipping method were 44, 63, and 62 ppm respectively. Flumethrin caused significant reduction in oviposition and hatchability in female ticks that survived sublethal concentrations, while sublethal doses of coumaphos had no effect on the reproductive potential of the tick. The results showed that flumethrin was 8 times more toxic than coumaphos