Schädlinge an Trieben von Tannen

Wien

2005

S. 33-34

5 Abb.

Artikel aus einer ZeitschriftUnselbständiges Werk

200127851

In the last years the number of diagnosis samples showing damage on shoots and buds of Firs especially in Christmas tree plantations and tree nurseries, has increased. Besides of different biotic and abiotic factors a high amount of damage was caused by Microlepidoptera. At the end of September, samples from a tree nursery reached the Department of Forest Protection showing feeding on two to three-year-old shoots but also on new young shoots. Two Microlepidoptera, Dioryctria sylvestrella and Dioryctria abietella (Spruce cone worm) were found causing the damage. A few years ago, a still unidentified pest occurred for the first time in a Christmas tree plantation. The symptoms looked like Grey mould infection at the beginning, then the needles turned to brown. The shoots died back from three to five centimetres and in the area to the healthy parts of the shoots showing exit holes. This damage occurred both in the Christmas tree plantation and in the nearby old fir stand. This was a severe infestation with several new shoots killed. However, no further damage could be observed the following year. Due to a pupa affected by parasites and found in one shoot, a Microlepidoptera is suspected to be responsible for the damage as well.