the clearing process during habitat modification eliminated one of the major sources of shelter for the ticks and thus probably made them more susceptible to the effects of extreme temperatures.

An economic evaluation of the costs of the habitat modification technique was made and compared with the costs of the alternative treatments, insecticide use and animal control through fencing (restricting animals to areas unlikely to be infested with ticks). In terms of total annual costs, the habitat modification was not the cheapest treatment but when total costs were evaluated in terms of the cost of production of a kilogram of plant dry matter per hectare, the habitat modification proved most profitable, costing $0.14 compared with $0.74 and $0.33 for fencing and insecticide use, respectively.

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