[The sensitivity of the tick Ornithodoros papillipes Bir. to Icon]

Laboratory trials have demonstrated a high and stable acaricidal activity of aikon towards O. papillipes ticks. The minimal dose (on filter paper) of aikon providing a 100% death of the ticks at all developmental phases, effective for at least 9-12 months, was 30 mg/m2. In exposure to this dose the ticks died within 1-7 days; if impregnated filter paper was stored for a long time, within 15-30 days. The lower the dose was, the slower the effect and lesser the total death rate of the ticks were.