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Organophosphorus residues in wool grease resulting from specified on-farm lice and flystrike control treatments


Horton, BJ and Best, DJ and Butler, LG and Gregory, GG, Organophosphorus residues in wool grease resulting from specified on-farm lice and flystrike control treatments, Australian Veterinary Journal, 75, (7) pp. 500-503. ISSN 0005-0423 (1997) [Refereed Article]

DOI: doi:10.1111/j.1751-0813.1997.tb14382.x


OBJECTIVE: To investigate wool organophosphorus concentrations resulting from a range of farm pesticide application methods. DESIGN: Random sampling of wool for pesticide residues and on-farm interviews to determine associated treatments. PROCEDURE: Tasmanian fleece wool lots were sampled at random and tested for organophosphorus residues. The grower was identified and the pesticide treatments applied to the sheep were ascertained by on-farm interview. RESULTS: The residue concentrations showed a large variation that was not accounted for by differences in treatments by growers. Organophosphorus concentrations were proportional to the number of treatments applied, and inversely related to the time between pesticide application and the subsequent shearing, and were significantly influenced by the method of application. After allowing for the time of application, plunge dipping resulted in pesticide residue concentrations 2 to 2.5 times greater than shower dipping, using spray races or hand jetting, and the use of these methods caused larger residues than the use of jetting races. CONCLUSIONS: We recommend that plunge or shower dipping should not be used more than 7 weeks after shearing, nor at higher concentration than the standard dose rate used for lice control, whereas jetting may be satisfactory for up to 7 months after shearing, provided only one application is administered.

Item Details

Item Type:Refereed Article
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Animal production
Research Field:Animal protection (incl. pests and pathogens)
Objective Division:Animal Production and Animal Primary Products
Objective Group:Livestock raising
Objective Field:Sheep for wool
UTAS Author:Horton, BJ (Dr Brian Horton)
ID Code:69872
Year Published:1997
Web of Science® Times Cited:10
Deposited By:Agricultural Science
Deposited On:2011-05-23
Last Modified:2017-04-13

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