Production System-based Model for Defining Economic Thresholds in Preweaner Beef Cattle, Bos taurus, Infested with the Lone Star Tick, Amblyomma americanum (Acari: Ixodidae)1

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Abstract
The relationship between rate of weight gain in preweaner beef cattle, Bos taurus (L.), and numbers of feeding female lone star ticks, Amblyomma americanum (L.), was used, with estimates of cost of tick control, to identify economic thresholds. An average of 26, 30, and 38 feeding female ticks per calf during a 100-day period caused damage equivalent to cost of control when the acaricides toxaphene-lindane, dioxathion, and stirofos, respectively, were applied at 100 day intervals.