Acaricidal Susceptibility of Five Strains of Boophilus microplus from Four Caribbean Countries12

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Abstract
The susceptibility of 5 strains of the southern cattle tick from Jamaica, St. Kitts, Trinidad, and Guyana, to 15 acaricides was determined by laboratory bioassay on 2-. to 3-wk-old unfed larvae. The LC50 values revealed that the Guyanese ticks were the most susceptible strain in the Caribbean, even more than the susceptible Yeerongpilly strain of Australia. The Jamaican strain and, to some extent, the Waller Field strain of Trinidad were the most resistant ones in the West Indies. Generally, carbamates (carbaryl, promecarb, propoxur and tsumacide (m-tdyl methylcarbamate)) were the most potent acaricides on all the strains, particularly from Guyana. Among the organophosphates, naled often was more toxic than carbamates, while crotoxyphos, diazinon, fenitrothion, chlorpyrifos, dimethoate, chlorfenvinphos, coumaphos. dioxathion, dicrotophos were quite effective but their LC50 varied for each strain. Chlordimeform also was fairly toxic to almost all the strains. Lindane was highly toxic to the Jamaican ticks, moderately SO to the Guyanese, but ineffective on the others. All strains were least susceptible to bromophos and DDT.

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