Results obtained by mass trapping using the synthetic pheromone (Z,E)- 9,12-tetradecadienyl acetate (TDA) are reported. The trapping was carried out over a period of 5 years to control infestation by Mediterranean flour moth, Ephestia kuehniella Zeller, and protect a flour mill. From March 2004 till November 2008, 42 funnel traps, each baited with 2 mg of TDA, were placed in the mill. Eight additional traps were located at the exterior of the facility, especially in the wheat silo area and near the loading equipment. Over 5 years, the pheromone traps attracted a total of 54 170 male Mediterranean flour moths. The constant presence of the traps caused a marked decrease in the E. kuehniella population from 2004 to 2008. The results of the surveys show that the population density of the moth can be notably reduced and then maintained at a low level in flour mills by means of mass trapping techniques accompanied by localized insecticide treatments and careful cleaning of the various departments and of the interior of all equipment. As it is not possible at present to establish the economic injury level of insect infestation in flour mills, there is a need for investigations into how the effectiveness of IPM programs can be evaluated in more detail.
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