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The bark beetle has an appetite

The bark beetle was because of the weather last year was particularly good. The amount of the by the book printer-infested spruce wood doubled. According to the Swiss Federal research Institute WSL, of the bark beetle to continue its rise. With Switzerland far 735'000 cubic metres of infested wood lot 2018, reaching the highest level since 2006. The results of the survey were published everywhere in all Swiss Forest on Wednesday.

The attack took place in all cantons North of the Alps compared to the previous year. Particularly from the Central plateau, the Jura and the Eastern part of Switzerland, the forest services reported a strong increase in beetle wood volumes. In extreme cases, the infested wood volume increased compared to the previous year, up twelve-fold.

ideal Wettermix for beetles

The beetle benefited last year from the sufficient available brood material: through storm and drought weakened pines. In the Winter of 2017/2018, several storms had knocked over tens of thousands of trees, or broken.

In the spring, then increased the temperature significantly, and in the summer, the persistent were finally at the end of lack of Rain and heat for extremely dry conditions. This combination made numerous spruce trees susceptible to bark beetles, and offered this food and habitat in Abundance.

Many animals hibernate

thanks to the high temperatures, the book printer is in the deep layers instead of the usual two, even three generations to create. The overwintering beetle population is larger than in previous years, such as the Institute WSL writes.

Should be in the year 2019, once again very hot and dry, is likely to remain the Situation is critical. Even without new extreme events such as storms or dry periods, numerous weakened, hatching suitable spruce trees from the previous year are in the forest.

Contrary to popular belief, that lie to the left of dead wood promotes the bark beetle, to flourish in the beetle only on freshly dead spruce, and this is usually only in the first year after their death.

Watch and act

for the situation To escalate further, the experts recommend to combat the bark beetle at an early stage. This means that Newly infested spruce trees would have to in a timely manner, i.e. before the next beetle generation flies away, like the forest dissipated or be stripped of its bark.

especially forests, in which as early as 2018, many standing spruce trees by bark beetles were infested should be monitored from April onwards on a regular basis. This relates primarily to storm-stricken areas, exposed to the sun, critical forest edges and in the previous year of the beetle-infested spruce groups. (fal/sda)

Created: 06.02.2019, 10:27 PM

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