![Sample our Food Science & Technology journals, sign in here to start your access, latest two full volumes FREE to you for 14 days]({"type":"image" , "src" : "/sda/5936/TOC-Subject-Sample-2021-Food-Science-Technology.jpg"})
Abstract
Small scale field trials were conducted to compare toxicity and residual activity on Holstein cattle of seven acaricides against Boophilus microplus (Canestrini) in Trinidad. Tick populations were assessed before and after a single spraying at which the makers' recommended dilutions of acaricides were used. The effects were examined on a basis of a) initial kill of immature ticks, b) effects on the viability of engorged females, c) residual effect in preventing larval reattachment.
Dioxathion had the longest residual activity of seven days. Chlorfenvinphos had an initial quick kill and short residual action similar to carbaryl. Ethion and chlorpyrifos were considered as equivalent to dioxathion except for a shorter residual activity. Both crotoxyphos and pyrimithate, although effective against immature ticks, did not show equivalent activity against engorged females. Chlorfenvinphos and dioxathion were considered the best alternatives to carbaryl in Trinidad. The need to relate choice of acaricide to cost effectiveness as well as technical efficiency was emphasised. The possible usefulness of the trial to other Caribbean islands is mentioned.