Invasive Species Compendium

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Abstract

Residues of insect growth regulators on Queensland wool.

Abstract

Wool samples, collected randomly from wool clips between April 1996 and April 1997, were tested for cyromazine, diflubenzuron and triflumuron. Information on use of these pesticides was obtained from flock managers by postal survey. Samples were collected from 362 flocks. Most samples contained <0.5 mg of residue per kg of greasy wool. The maximum residues detected for cyromazine, diflubenzuron and triflumuron were 120, 310 and 240 mg/kg, respectively. The median residues for samples in which residues were detected (>0.5 mg/kg) were 22, 28 and 22 mg/kg, respectively. Cyromazine was most commonly used (107 occasions) and was the pesticide of choice for flystrike [Lucilia cuprina] control. Survey respondents favoured triflumuron for louse [Bovicola ovis] control. Diflubenzuron was used more commonly for louse control than flystrike control.