The uptake and depletion of fenitrothion in cattle, pasture and soil following spraying of pastures for locust control
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Published:1999
Issue:8
Volume:39
Page:915
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ISSN:0816-1089
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Container-title:Australian Journal of Experimental Agriculture
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language:en
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Short-container-title:Aust. J. Exp. Agric.
Author:
Gilmour A. R.,McDougall K. W.,Spurgin P.
Abstract
Summary. Fenitrothion is an organophosphorus insecticide
widely used for the control of locusts in Australia and overseas. It is
sprayed on swarms and bands of locusts and on the pastures on which they feed.
However, there is little Australian data on depletion rates of fenitrothion
when used this way. Consequently, there has been concern that beef cattle
producers may not be able to guarantee that their cattle meet legal
requirements with respect to residue levels following grazing on sprayed
pasture. This paper reports a study conducted in February 1998 in central
western New South Wales on the rate of depletion of fenitrothion in cattle,
pasture and soil after fenitrothion spraying. The cattle were 18-month-old
heifers in forward store condition. Fenitrothion was detected in the fat of 7
of the 66 exposed cattle. Residues in 2 of these exceeded the Maximum Residue
Limit of 0.05 mg/kg. No fenitrothion was detected in the fat of the 26
cattle slaughtered 14 days or later after treatment or in muscle and liver
samples. The half life of fenitrothion was 2–3 days in the soil and
1–2 days in the pasture. We conclude that the 14-day slaughter
withholding period currently approved by the National Registration Authority
is appropriate.
Publisher
CSIRO Publishing
Subject
General Agricultural and Biological Sciences
Cited by
1 articles.
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