An experimental investigation into the effects of flooding on the ixodid tick Boophilus microplus (Canestrini).

The effect of water immersion on the non-parasitic stages of Boophilus microplus were investigated both under laboratory and field conditions. Survival of engorged female ticks was influenced by their age and the temperature of the water. Eggs and larvae were more resistant to submerison than were engorged females and their survival was increased at low temperatures and in water with high oxygen content. The persistence of this tick in areas prone to flooding was attributed to the survival of parasitic stages and to larvae on the pasture. Heavy rains produce favourable pasture conditions for tick reproduction so that a large increase in population size may be expected to follow such rain.