Suppression of the blowfly Lucilia sericata using odour-baited triflumuron-impregnated targets.
Field trials were carried out in 1995 and 1996 on farms in the south-west of England to assess the extent to which odour-baited targets could be used to suppress populations of L. sericata in sheep pastures. Targets were constructed from 41 × 41 cm squares of aluminium sheet, covered by white cloth which had been dipped in a mixture of sucrose solution (50% w/v) and the chitin synthesis inhibitor triflumuron (10% suspension concentrate). Each target was baited with ∼300 g of liver and sodium sulfide solution (10%). 3 matched sheep farms were used in the trials. In 1995, triflumuron-impregnated targets were placed around the periphery of sheep pastures at one of the farms in late June, at ∼1 target per hectare. In 1996, triflumuron-impregnated targets were placed around the periphery of sheep pastures of the 2nd of the farms in early May, at ∼5 targets per hectare. Each year, 5 sticky targets, used to monitor the L. sericata populations, were also placed in fields at the experimental and the other 2 farms, which acted as controls. In 1995, the results provided some, although inconclusive, evidence that the triflumuron-impregnated targets had reduced the numbers of L. sericata relative to the populations on the 2 control farms. In 1996, however, the density of L. sericata on the experimental farm was reduced to almost zero and remained significantly lower than on 2 control farms throughout the period during which the triflumuron-impregnated targets remained in the field. The results are discussed in relation to the use of triflumuron-treated targets as a practical means of controlling L. sericata and sheep blowfly strike.