engleski

Citrus Whitefly, Dialeurodes citri (Homoptera: Aleyrodidae) in Adriatic Region of Croatia

Dialeurodes citri first invaded citrus orchards of South Adriatic during 1977, near Dubrovnik. Because this pest characteristics have not been studied in Croatia, this paper reviews its morphology, distribution, host plant range, biology and ecology. Leaf samples, collected all ocer Croatian cost and islands, were observed in the laboratory to create the map with citrus withefly location spots and the list of host plants. Pest biological cycle, life cycle and overwintering were investigated in Split region (May 1996- May 1998). For these purposes, samples of 30 leaves (10 leaves of each lemon, mandarine and persimmon) were collected weekly from the selected site, during the warm period of the year. During the winter, lemon and mandarine leaf samples were collected once per month. Perimaginal stages numbers per leaf and their persence were recorded. Adult stage persence was observed few times a week in the field, in period May-November. The persence of citrus whitefly was confirmed in all citrus growing area of Croatia. The number of noted host plants was somewhat lower than in Meditarranean countries. Other than citrus it colonized and harmed: laurustinus (Viburnum tinus), persimmon (Diospyros kaki) and several plants of Oleaceae. There were three pest generations on citrus per year in Split region. However the part of larval population that belonged to second generation did not finish postembrionic development and it remained on the summer flush leaves and waited the hibernation. Pest took 43 to 72 days to develop from egg to adult stage in the field conditions, during the vegetation period. It overwintered mainly as fourth instar larva. There were two pest generations on decidous persimmon tree in a year. In destinction from other Mediterranean countries Dialeurodes citri is the only aleyrodid species on citrus in Croatia persently.

Dialeurodes citri; Adeiatic; Croatia

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