The tobacco whitefly, Bemisia tabaci (Gennadius, 1889) has been reported for the first time in Croatia on plants of Euphorbia pulcherrima and cuttings of Thunbergia grandiflora in the county of Splitsko-Dalmatinska in 2000. In 2001 we started with monitoring of this quarantine pest in all 21 counties of Croatia. In this project were involved the most important producers of vegetables and flowers in glasshouses and the importers of potted plants and cut flowers. Eventual presence of tobacco whitefly adults on the plants in greenhouses was established by the hanging of yellow sticky traps. In the course of monitoring the undersides of leaves on host plants were inspected for the purpose of discovering pest nymphal and pupal stages. The plants of poinsettia produced as pest free plants have been used as catch plants in the conditions of lower infestation of host plants by tobacco whitefly adults. During the monitoring in year 2001. and 2002. by using the listed methods the species Bemisia tabaci was reported on 39 localities in 10 counties of Croatia and in 5 imported shipments of poinsettia on 2 border-transits. Thirty two host plants were recorded in the greenhouses and in open field. IZVLEČE
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