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Light traps with sticky sheets are effective tools for controlling and monitoring stored-product pests. Cigarette beetle is an important storage pest. Light attracts both beetle sexes; often, single light traps are deployed in a large area, because they are larger and costlier than pheromone traps (which capture only males). Cigarette beetles occur in aggregates in areas with many obstacles, suggesting that a single trap is insufficient. To improve trapping efficacy at a low cost, we compared the number of trapped beetles among one, two or four small light traps (8 W) versus a single large light trap (50 W), attached to the wall(s) of a single darkroom (7.2×3.2×2.4 m, 25‒30°C). Per treatment, 500 laboratory-reared adult beetles were released in the middle of the room. Half of the treatments had an opaque plastic wall (2×2 m) in the center of the room. After 6 hours, the mean number/trap of beetles captured with sticky sheets (7 replications) was 46.4, 39.4, 57.1 and 88.2, for one large and one, two and four small light traps, respectively. The obstacle did not affect these numbers. Hence, single lights trapped as many beetles, and more beetles were captured when more small lights were present.

Effect of light trap size and location on capturing of cigarette beetle, <i>Lasioderma serricorne</i> (F.) (Coleoptera: Anobiidae)