engleski

Western Corn Rootworm (WCR), Diabrotica virgifera virgifera LeConte in Croatia - Current and Future Status

In Croatia the western corn rootworm (WCR), Diabrotica virgifera virgifera LeConte was found for the first time in 1995. Since 1995 the pest has been monitored by the Faculty of Agriculture, Department for Agricultural Zoology. In Croatia the WCR spread over a distance of 40 km per year. In 2001 a minor spread to the west was registered. Inspite of minor spreading, population density has increased thus futher spread of the WCR was expected. The monitoring campaign continued in 2002. As in previous years, pheromone and Pherocon AM traps were placed out on 145 monitoring sites. Traps were placed out between June 17^th and June 23^rd. Each 7 days traps were checked and betles collected. The first catch on pheromone trap was registered on June 21^st. The data from the monitoring sites are still collected and final results on the flight dynamics and population density will be presented in the report. In 2002 the WCR was registered for the first time on 8 monitoring sites located outside the area infested in 2001. All the 8 monitoring sites mentioned were located in the central and southern part of the infested area. No further spread along the Hungarian border has been registered. Before disposing, all the results we can state that the WCR has infested an area of about 19.000 km^2. In that area approx. 250, 000 ha of corn is grown. The preliminary results of the monitoring are shown in table. Damages caused by the WCR in 2002 in some fields in the eastern part of Croatia were visible and high. In the Baranja region a 1.5 ha field with a damage up to 85% was registered. The development of the WCR in Croatia in 2002 proved the statement (Igrc Barrčić et al., 2001) that root damage increase in 2002 may be expected. Countries which have been infested over the past 4 years, have a high amuont of corn (over 35% of all crops) because of animal breeding. This situation means more continuous corn and conditions favouring pest development in future.

western corn rootworm; Croatia; status

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