Spreading of western corn rootworm Diabrotica v. virgifera in Slovenia in the period 2003 - 2007 | Širjenje koruznega hrošča Diabrotica v. virgifera v Sloveniji v obdobju 2003 - 2007

anglais. The western corn rootworm, Diabrotica virgifera virgifera (Dvv), was found for the first time in Slovenia in 2003, in the eastern regions of Pomurje and Podravje along the border with Hungary and Croatia, and in the western region Goriška near the border with Italy. Between 2003 and 2007, its spreading in Slovenia was systematically monitored. To catch the pest we used pheromone and floral bait traps and yellow sticky traps. Computer analyses adopting plant protection geographical information systems (GIS) suggested that between 2003 and 2006 Dvv was spreading progressively from north-east towards the interior of the country by 24 km/year on the average while in 2007, due to favourable environmental conditions, the area of its spread increased by 70 km. The pattern of Dvv spreading indicates that the main transport routes such as roads, railway, Jože Pučnik Airport including some small scale airports with an increased inland traffic and larger resting places along the highways are, beside its natural spreading and growing of maize as monoculture, one of the major factors affecting its spread in Slovenia. In 2007, Dvv appeared earlier than in the previous years which resulted in a considerable difference as to the extent of spreading.

slovène. Koruznega hrošča, Diabrotica virgifera virgifera (Dvv), smo v Sloveniji prvič našli leta 2003 na vzhodu v Pomurju in Podravju vzdolž meje z Madžarsko in Hrvaško ter na zahodu na Goriškem v bližini meje z Italijo. V obdobju 2003-2007 smo sistematično spremljali njegovo širjenje v Sloveniji. Za ulov škodljivca smo uporabljali feromonske in spolno-prehranske vabe ter rumene lepljive plošče. Na podlagi rezultatov smo ugotovili, da se je koruzni hrošč v obdobju 2003-2006 postopoma širil od severovzhoda proti notranjosti države za povprečno 24 km/leto, v letu 2007 pa se je, zaradi zanj ugodnih okoljskih razmer, areal njegove razširjenosti povečal za dobrih 70 km. Vzorec širjenja Dvv kaže na to, da so glavne transportne poti, kot so ceste, železnica, letališče Jožeta Pučnika, vključno z nekaterimi manjšimi letališči s povečanim notranjim prometom ter večjimi počivališči ob avtocestah, poleg njegovega naravnega širjenja in pridelave koruze v monokulturi, eden glavnih dejavnikov, ki vplivajo na njegovo razširjenost pri nas. V letu 2007 se je koruzni hrošč pojavil prej kot v prejšnjih letih, zaradi česar je prišlo tudi do občutnih razlik v obsegu širjena.