Economically important stored product insects were monitored using pheromone baited sticky traps and pheromone/oil baited pitfall traps in a grain processing facility. Traps placed throughout the mill and attached warehouse were serviced from one to four weeks apart depending on insect activity. During the study, a professional fumigation company fumigated the mill using methyl bromide and fogged the warehouse with a combination of dichlorvos + pyrethrins. This event allowed a direct comparison of insect captures before and after the insecticide application. Evaluation of insect populations was based on average number of adult insects captured per trap and the proportion of traps containing at least one insect. Following the fumigation, Tribolium castaneum (red flour beetle) and Latheticus oryzae (longheaded flour beetle) captures in both the mill and warehouse decreased in terms of average captures and proportion of traps with insects present. Conversely, the average numbers of Trogoderma spp. (primarily warehouse beetle) captured in the mill slightly decreased the week following the fumigation, while captures in the warehouse increased dramatically.
Species 1: Coleoptera Dermestidae Trogoderma variabile (Warehouse beetle)
Species 2: Coleoptera Tenebrionidae Latheticus oryzae (Longheaded flour beetle)
Species 3: Coleoptera Tenebrionidae Tribolium castaneum (Red flour beetle)
Keywords: monitoring, pheromone trapping
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