Rosskastanienminiermotte Cameraria ohridella - Befallssituation in Oesterreich

Wien

1995

3 Lit. Ang.

Unselbständiges Werk

12531

200051546

The lithocolletid-moth Cameraria ohridella which first had been reported in Austria in 1989, was spread all over the country in 1994. More than 70% of all the 1303 examined horse chestnut trees showed characteristical mines on their leaves caused by the larvae of the moth. In Vienna and Lower Austria more than 80% of the observed trees were damaged, sometimes so strong, that trees lost their leaves allready in July. Additional factors damaging horse chestnut leaves were examined. The leaf blotch fungus Guignardia aesculi was the dominating factor of leaf-injuries in Tyrol and Salzburg, whereas in Eastern Austria a lot of trees showed necrotic brown parts at the edge of the leaves as a consequence of salt spray or summer draught. In the forests beside the Danube (Lobau) young maples (Acer) also were infested by the moth, which has not been observed before.