Insects on poinsettia, Euphorbia pulcherrina (L.) in a commercial greenhouse were monitored with yellow sticky card (YC) traps and YC equipped with 530 nm lime light-emitting diodes (LED-YC) traps from 3 June to 25 November 2002. Monitoring was done on four species of pest insects: Bradysia coprophila (Lintner), Bemisia tabaci (Gennadius) biotype B (=B. argentifolii, Bellows and Perring), Frankliniella occidentalis (Pergande) and Empoasca sp. Three groups of natural enemies: Orius tristicolor (White), hymenopteran wasps, and staphylinid beetles were also monitored. A few individuals of other insect species were also captured on YC and LED-YC traps, but were not identified. High levels of Bradysia coprophila occurred from mid June to late August, and high levels of Bemisia tabaci biotype B were observed during early September to mid October. Two population peaks of F. occidentalis occurred between early June to mid July and in October. Empoasca sp. populations were very low during the experimental period. Overall, LED-YC traps captured more Bradysia coprophila, Bemisia tabaci biotype B, Empoasca sp., and staphylinid beetles compared with YC traps. The capture of F. occidentalis, O. risticolor, and hymenopteran wasps were not significantly affected by the YC traps equipped with LEDs. It appears that the LED-YC traps attract three major pest insects in poinsettia greenhouses and are compatible with natural enemies, O. tristicolor and hymenopteran wasps, but incompatible with staphylinid beetles. The results suggest that LED-YC traps may be useful to monitor and reduce pest populations in greenhouse, and may play a role in integrated pest management programs.
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