A large number of spruce bark beetles overwinter in the soil

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00020702%3A_____%2F20%3AN0000138" target="_blank" >RIV/00020702:_____/20:N0000138 - isvavai.cz</a>

Result on the web

<a href="https://www.vulhm.cz/files/uploads/2020/10/Book-of-Abstracts_Forest-future-2020.pdf" target="_blank" >https://www.vulhm.cz/files/uploads/2020/10/Book-of-Abstracts_Forest-future-2020.pdf</a>

DOI - Digital Object Identifier

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Result language

angličtina

Original language name

A large number of spruce bark beetles overwinter in the soil

Original language description

Contribution in an international conference book of abstracts. An effective control of forest pests requires a knowledge of their ecological requirements and bionomy. As a result of changing environmental conditions, some of the findings of earlier studies may no longer be valid. For example, spruce bark beetle (Ips typographus) is known to overwinter under tree bark and in the soil. The number of beetles which spend winter in the soil litter is traditionally considered marginal. Research studies report a proportion of about 10% of the population, while as the altitude increases, this proportion is even lower. Recently, we have observed that even when all bark beetleinfested trees are felled and removed from the area, there is a massive attack of bark beetles to the surrounding uninfested trees in the following year. The present study tests the hypothesis that the cause of this phenomenon lies in a large number of beetles overwintering in the soil litter. At six sites (central and northern Bohemia, 400–800 m a.s.l.), in the spring period of 2019 (April and May), we laid traps (modified photoeclectors) for bark beetles overwintering in the soil. At each location, we selected three sample trees not very distant from each other. One tree was not attacked, another was attacked with partial bark fallen and yet another was attacked but still without the bark fallen, fully remaining on the tree). For each sample tree, in two directions (south–north), three traps were placed under the crown in one-meter intervals from the base of the trunk, i.e., a total of six traps per tree, 18 traps per site. Before installing the traps, we removed larger pieces of bark lying on the ground. This prevented distortion of the results by counting beetles wintering in the bark.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

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OECD FORD branch

40102 - Forestry

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2020

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů