Aktuelle Schäden in Christbaumkulturen

Recent damage to Christmas tree plantations

Wien

1999

Unselbständiges Werk

12531

200082123

Because of samples sent in and field investigations the institue of forest protection has a good overview of important recent pests and diseases occuring in Christmas tree- plantations. Like in the past few years, fir aphids were found all over Austria. Especially in Styria, Salzburg, the Tyrol and Upper Austria not only Xmas tree plantations, but also regular forest were infested. In most cases the Silver fir migratory adelges, Dreyfusia (Adelges) nordmannianae was the reason for the damages, but also other Dreyfusia - species were found. Severe damage was caused by feeding of Green needle weevils (Polydrusus spp.), and the Gregarious spruce sawfly (Pristiphora abietina) could be found too. A very important disease, also occuring since a couple of years, is the Grey mould (Botrytis cinerea). Often, herbicides were reason for damage - mainly as regards fir trees. By way of contrast, in 1999 the Green spruce aphid (Liosomaphis abietinum) and the Spruce needle rust (Chrysamyxa abietis) have only minor importance. Detailed information on the pests and diseases cited above can be required from our home page at www.fbva.bmlf.gv.at.