{"id":2925,"date":"2025-07-10T18:35:46","date_gmt":"2025-07-10T16:35:46","guid":{"rendered":"https:\/\/copture.com\/?page_id=2925"},"modified":"2025-09-19T17:07:37","modified_gmt":"2025-09-19T15:07:37","slug":"questions-and-answers-about-spruce-bark-beetle","status":"publish","type":"page","link":"https:\/\/copture.com\/en\/fragor-och-svar-om-granbarkborre\/","title":{"rendered":"Questions and answers on spruce bark beetle"},"content":{"rendered":"
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Questions and answers on spruce bark beetle<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"spruce\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/i><\/span>\n\t\t\t\t\t\t\t\t<\/i><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\tWhat is a spruce bark beetle?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t
The spruce bark beetle is a beetle belonging to the bark beetles and is about 4 millimetres long. There are about 90 species of bark beetles in Sweden, almost 30 of which can live on spruce. However, the spruce bark beetle is the only one of these species that can kill large healthy spruces. The forestry industry usually refers to the six-toothed and eight-toothed spruce bark beetle. The latter causes the most economic damage to forest owners as it mainly attacks large spruces.<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t
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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/i><\/span>\n\t\t\t\t\t\t\t\t<\/i><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\tWhat does the spruce bark beetle do in the spruce?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t
It reproduces. That is, the females lay their eggs there, which then become larvae and finally adult spruce bark beetles that hatch from the spruce later in the summer.<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t
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\"questions<\/p>

The spruce bark beetle is a natural part of Sweden's forests and affects forest dynamics. It also has a positive impact on biodiversity, provided that infestations are not excessive. More than 140 insect species live as predators, fungus eaters or decomposers in the bark beetle pathway. When the bark beetles abandon the trees after a year, more organisms will live in the dead wood until the log is completely decayed. It also creates openings in the forest, favouring plants and animals that thrive in sunny locations.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t

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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/i><\/span>\n\t\t\t\t\t\t\t\t<\/i><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\tCan the spruce bark beetle kill all spruces?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t
No, they don't. Firstly, the spruce bark beetle cannot use young spruces - it is unusual for them to attack spruces with a diameter of less than 13 cm. Secondly, if spruce trees became more rare, infestations would decrease. Because healthy and vigorous spruces defend themselves effectively against attack, it takes a large number of spruce bark beetles to kill a spruce, and if spruces are not common enough, they cannot become numerous enough.\n\n\n<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t
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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/i><\/span>\n\t\t\t\t\t\t\t\t<\/i><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\tWhat will affect the size of the infestation next year?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t

Three main factors will determine the extent of the infestation next year:<\/p>

1. The weather
2. the number of bark beetles and
3. the vitality of the trees.<\/p>

The weather is the most important factor. Dry and warm weather favours bark beetles, while the opposite favours spruces. The number of bark beetles depends on their reproductive success; if it has been low, one can expect a lower risk of damage in the coming season. Reproductive success is monitored by the Swedish University of Agricultural Sciences (SLU). One problem is that it is difficult to harvest most of the infested trees in time when infestations are extensive as in recent years. It is important to note that all outbreaks in Sweden so far have stopped after a few years when the forest has recovered and long before all the spruce forest has been killed.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t

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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/i><\/span>\n\t\t\t\t\t\t\t\t<\/i><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\tIn Europe, spruce bark beetles have also caused damage, what comparisons can we make?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t

Over the last 4-5 years, large areas of central Europe have experienced dry and hot summers that have favoured spruce bark beetles. In countries like the Czech Republic, this has led to disastrous consequences because the infestation was not responded to quickly enough. In 2017, 2.5 million cubic metres of wood were infested, the following year 20 million cubic metres. These examples show the importance of acting decisively.<\/p>

Sweden and the Nordic countries have much more proactive forest management than Central Europe, which provides advantages in the fight against bark beetles. One advantage is that insect pests are detected earlier with more effective technology. Another advantage is that we have long worked with tree breeding, which creates the conditions for stronger trees that can better resist attacks.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t

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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/i><\/span>\n\t\t\t\t\t\t\t\t<\/i><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\tHow can I tell if a spruce is infested with spruce bark beetle?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t

Spruce bark beetle infestations can be difficult to detect. During spring and summer, it is important to be alert to spruce bark beetle in the forest. Signs of infestation include:<\/p>