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Publikasjoner

NIBIOs ansatte publiserer flere hundre vitenskapelige artikler og forskningsrapporter hvert år. Her finner du referanser og lenker til publikasjoner og andre forsknings- og formidlingsaktiviteter. Samlingen oppdateres løpende med både nytt og historisk materiale. For mer informasjon om NIBIOs publikasjoner, besøk NIBIOs bibliotek.

2025

Sammendrag

In 2024, spruce bark beetle (Ips typographus) catches decreased in all counties except Telemark, Sør-Trøndelag, and Nordland. The highest catches this year were observed in Telemark and Buskerud. In Telemark, the catches are the highest recorded since the major spruce bark beetle outbreak that started in the mid-1970s. In Buskerud, while catches have declined compared to last year, they remain historically high. In Oppland, the catches have decreased markedly from the record-breaking year of 2023 but remain at moderately high levels. Across Southern Norway, this year’s catches are slightly above the 46-year average. The relatively high catches in Buskerud and Oppland are likely a delayed response to the storm damage in November 2021, as municipalities heavily affected by the storm report especially high catches. Additionally, field reports in 2024 indicate attacks on standing trees in areas with much windfall after the 2021 storm. Many of these damage reports likely pertain to trees attacked by beetles in 2023 or earlier but that are only now showing visible symptoms. The 2024 bark beetle season was characterized by extremely dry and warm weather in May, followed by a very wet summer with normal to slightly below-average temperatures. The warm May weather coincides with the beetles' primary flight period, favoring beetle dispersal and egg-laying. Additionally, the dry conditions in May may have stressed spruce trees, reducing their resistance to beetle attacks. The wet weather later in the summer likely benefited the trees while being sub-optimal for the beetles. Overall, the weather conditions during the 2024 season were probably relatively favorable for the beetles. A temperature-based development model estimate that, by September 17, the spruce bark beetle could have completed two generations near the Oslofjord, along the southern coastline, and in low-lying inland valleys. However, these model results do not necessarily mean that the beetles completed two generations in 2024 but indicate that conditions were warm enough to make it possible.

Sammendrag

Det er usikkerhet knyttet til fremtidig melkeproduksjon i Norge, både produksjonsvolum, geografisk fordeling, og hvilken struktur, lønnsomhet og robusthet som vil karakterisere næringen. En positiv økonomisk utvikling i melkeproduksjonen, kombinert med målrettede støtteordninger for små og mellomstore melkebruk, kan stimulere til økte investeringer også på gårder med mindre enn 30 kyr. Dette kan bidra til å opprettholde dagens produksjonsvolum, og potensielt gi en økning. Hvis lønnsomheten i melkeproduksjonen svekkes, kan det bli utfordrende å opprettholde dagens produksjonsvolum. En akselerert strukturendring i næringen kan resultere i at produksjonen konsentreres i regioner med høy dyretetthet og på gårdsbruk med større kapasitet.