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24 I EUROPEAN SEED I EUROPEAN-SEED.COM he crop that covers the largest area in Austria is maize. It has the highest productivity growth and is grown on about 23 per cent of fields which is about 308000 ha. However the pro- duction area is decreasing due to the beetle western corn rootworm WCR with its scientific name Diabrotica virgifera virgifera LeConte. This insect has become economically the most significant pest in some parts of Austria. In 2002 10 years after its first appearance in Europe in Belgrade WCR crossed the eastern border into Austria. The beetle was first found along the Hungarian and Slovakian border in Burgenland and Lower Austria. In 2003 it had reached Styria by 2007 it was discovered in Upper Austria and then a year later in Carinthia. In 2013 the first indi- viduals were found in Salzburg and Tyrol. Maize is mainly grown in the provinces Styria Upper Austria and Lower Austria but it is also grown in Burgenland and Carinthia. Because of its close association with maize Zea mays L. as a larval and adult host WCR predominantly inhabits regions where maize is planted consecutively in large monocultures. HOW TO STOP A PEST IN The naturalisation of the alien Diabrotica virgifera virgifera LeConte. BY MARION SEITER T At high rootworm densities root pruning from WCR may be severe enough to cause plant lodging and reduce yields