https://researchdata.se/en/catalogue Search results en Inventories of forest damage are carried out within the Swedish University of Agricultural Sciences (SLU) Forests programme. An annual monitoring of the most important sources of forest damage is carried out by the Swedish National Forest inventory (NFI). Although the Swedish NFI is an objective and uniform inventory of forest damage in Swedish forests at national and regional scales, less common or less widespread occurrences of forests pests and pathogens are difficult to survey solely through large-scale monitoring programmes. There is a need for complementary inventories to facilitate timely delivery of relevant information. Thus Target-tailored forest damage inventories (TFDI) aiming at providing data for operational decisions making at local level, and linked to specific damage events were introduced. TFDI’s are developed to give rapid response to requested information of specific damage outbreaks. The TFDI’s are carried out in limited and concentrated samples, with flexible but robust methods and design. The data collected in the TFDI shall also be of such quality that it can be useful in research. During 2011 TFDI carried out a sample inventory of the volume Norway spruce (Picea abies) damage by bark beetles, Four-eyed spruce bark beetle (Polygrapus poligraphus) and/or European spruce bark beetle (Ips typographus) in older spruce forest in the county of Västernorrland. The purpose of the inventory was to estimate the volume Norway spruce damage by the given bark beetles, but also to highlight geographical distribution and the appearance of the damage in different forest sites. The inventory was stratified by an objective sample of the National Forest Inventory al permanent sample plots in the county of Västernorrland. Included plots within the sample was older thinning forest and final felling mature forest consisting of at least 7/10 spruce and a lesser proportion of forest with lesser share of spruce or younger thinning forest. The radii of sample plots use for the damage inventory was 25 m. Diameter at breast height was measured on damage trees. Furthermore specie of bark beetle and age of damage was recorded. In total 97 plots and 236 trees was measured. Some assessed and used variables At sample plot level Plot area measured Occurrence of new attack of Four eyed spruce bark beetle Occurrence of new attack of European spruce bark beetle Occurrence of older damage caused by the bark beetles The proportion of spruce damage by bark beetles sample plot radii 10 m The proportion of spruce damage by bark beetles sample plot radii 25 m The proportion of spruce at the sample plot At tree level Is the tree dead or alive? Diameter at breast height Which specie of bark beetle has attacked the tree? Which season did the damage occur? Distance to tree edge Tree height Tree volume See the document "Data_description" for more detailed information. As additional documentation, field instructions for the inventories are also provided. Fri, 21 Feb 2025 14:57:40 GMT https://researchdata.se/en/catalogue/dataset/2024-485 https://researchdata.se/en/catalogue/dataset/2024-485 Swedish University of Agricultural Sciences Sören Wulff Cornelia Roberge Target-tailored forest damage inventories (TFDI) aiming at providing data for operational decision making at local level and linked to specific damage events, are undertaken by the Swedish University of Agricultural Sciences. TDFIs are developed to give a rapid response to requested information on specific damage outbreaks. The TDFIs are carried out in limited and concentrated samples, with flexible but robust methods and design. During 2012, TFDI carried out a sample inventory of resin top disease (Cronartium flaccidum) in young forest in northern Sweden (county of Norrbotten (coastal part) and Västerbotten (southern part)). The purpose of the inventory was to estimate the area of damaged young forest, but also to highlight the geographical distribution and the appearance of the damage on different types of forest sites and in different types of regeneration. The inventory was stratified by using data from the Swedish Forest Agency's moose grazing inventory (ÄBIN). In total 173 forest stands were inventoried. Within each stand, 8 circular sample plots with a radius of 3.5 m were inventoried. All trees in the sample plots were counted and all trees infected by resin top disease both dead and alive were noted. Some assessed and used variables: Tree species proportion Number of trees Number of infected alive trees Number of infected dead trees Altitude Vegetation type – Forest classification unit based on field and ground layer vegetation Cleaning Regeneration See the document "Data_description" for more detailed information. As additional documentation, field instructions for the inventories are also provided. Mon, 29 Apr 2024 12:58:46 GMT https://researchdata.se/en/catalogue/dataset/2024-62 https://researchdata.se/en/catalogue/dataset/2024-62 Swedish University of Agricultural Sciences Sören Wulff Cornelia Roberge Inventories of forest damage are carried out within the Swedish University of Agricultural Sciences (SLU) Forests programme. An annual monitoring of the most important sources of forest damage is carried out by the Swedish National Forest inventory (NFI). Although the Swedish NFI is an objective and uniform inventory of forest damage in Swedish forests at national and regional scales, less common or less widespread occurrences of forests pests and pathogens are difficult to survey solely through large-scale monitoring programmes. There is a need for complementary inventories to facilitate timely delivery of relevant information. Thus Target-tailored forest damage inventories (TFDI) aiming at providing data for operational decisions making at local level, and linked to specific damage events were introduced. TFDI’s are developed to give rapid response to requested information of specific damage outbreaks. The TFDI’s are carried out in limited and concentrated samples, with flexible but robust methods and design. The data collected in the TFDI shall also be of such quality that it can be useful in research. During 2012 TFDI carried out a sample inventory of the volume Norway spruce (Picea abies) damage by bark beetles, Four-eyed spruce bark beetle (Polygrapus poligraphus) and/or European spruce bark beetle (Ips typographus) in older spruce forest in the county of Västernorrland. The purpose of the inventory was to estimate the volume Norway spruce damage by the given bark beetles, but also to highlight geographical distribution and the appearance of the damage in different forest sites. The inventory was stratified by an objective sample of all the National Forest Inventory permanent sample plots in the county of Västernorrland. Included plots within the sample was older thinning forest and final felling mature forest consisting of at least 7/10 spruce and a lesser proportion of forest with lesser share of spruce or younger thinning forest. The radii of sample plots use for the damage inventory was 25 m. Diameter at breast height was measured on damage trees and wind-felled trees. Diameter on stump from cut trees with fresh damage was measured. Furthermore species of bark beetle and age of damage was recorded. The inventory was carried out in the same way as in 2011, but with the addition that damaged wind-felled trees and stumps from cut damaged trees were included. In total 87 plots and 194 trees was measured. Some assessed and used variables At sample plot level: Plot area measured The proportion of spruce at the sample plot Maturity class At tree level: Is the tree dead or alive? Position of tree – standing, wind thrown, stump Diameter at breast height Which specie of bark beetle has attacked the tree? Which season did the damage occur? Tree volume See the document "Data_description" for more detailed information. As additional documentation, field instructions for the inventories are also provided. Tue, 10 Dec 2024 08:14:07 GMT https://researchdata.se/en/catalogue/dataset/2024-509 https://researchdata.se/en/catalogue/dataset/2024-509 Swedish University of Agricultural Sciences Sören Wulff Cornelia Roberge Target-tailored forest damage inventories (TFDI) aiming at providing data for operational decision making at local level and linked to specific damage events, are undertaken by the Swedish University of Agricultural Sciences. TDFIs are developed to give a rapid response to requested information on specific damage outbreaks. The TDFIs are carried out in limited and concentrated samples, with flexible but robust methods and design. During 2008, TFDI carried out a sample inventory of resin top disease (Cronartium flaccidum) in young forest in northern Sweden (county of Norrbotten and Västerbotten). The purpose of the inventory was to estimate the area of damaged young forest, but also to highlight the geographical distribution and the appearance of the damage on different types of forest sites and in different types of regeneration. The inventory was stratified by using data from the Swedish Forest Agency's moose grazing inventory (ÄBIN). In total 197 forest stands were inventoried. Within each stand, 8 circular sample plots with a radius of 3.5 m were inventoried. All trees in the sample plots were counted and all trees infected by resin top disease both dead and alive were noted. Some assessed and used variables: Tree species proportion Number of trees Number of infected alive trees Number of infected dead trees Altitude Vegetation type – Forest classification unit based on field and ground layer vegetation Soil humidity See the document "Data_description" for more detailed information. As additional documentation, field instructions for the inventories are also provided. Mon, 29 Apr 2024 12:58:34 GMT https://researchdata.se/en/catalogue/dataset/2023-123-1 https://researchdata.se/en/catalogue/dataset/2023-123-1 Swedish University of Agricultural Sciences Sören Wulff Cornelia Roberge Inventories of forest damage are carried out within the Swedish University of Agricultural Sciences (SLU) Forests programme. An annual monitoring of the most important sources of forest damage is carried out by the Swedish National Forest inventory (NFI). Although the Swedish NFI is an objective and uniform inventory of forest damage in Swedish forests at national and regional scales, less common or less widespread occurrences of forests pests and pathogens are difficult to survey solely through large-scale monitoring programmes. There is a need for complementary inventories to facilitate timely delivery of relevant information. Thus Target-tailored forest damage inventories (TFDI) aiming at providing data for operational decisions making at local level, and linked to specific damage events were introduced. TFDI’s are developed to give rapid response to requested information of specific damage outbreaks. The TFDIs are carried out in limited and concentrated samples, with flexible but robust methods and design. The data collected in the TFDI shall also be of such quality that it can be useful in research. During 2013 TFDI carried out a sample inventory of the volume Norway spruce (Picea abies) damage by bark beetles, Four-eyed spruce bark beetle (Polygrapus poligraphus) and/or European spruce bark beetle (Ips typographus) in older spruce forest in the county of Västernorrland. The inventory included both standing and wind-felled trees. The purpose of the inventory was to estimate the volume Norway spruce damage by the given bark beetles, but also to highlight geographical distribution and the appearance of the damage in different forest sites. The inventory was stratified by an objective sample of all the National Forest Inventory permanent sample plots in the county of Västernorrland. Included plots within the sample was older thinning forest and final felling mature forest consisting of at least 7/10 spruce and a lesser proportion of forest with lesser share of spruce or younger thinning forest. The radii of sample plots use for the damage inventory was 25 m. Diameter at breast height was measured on damage trees and wind-felled trees. Diameter on stump from cut trees with fresh damage was measured. Furthermore species of bark beetle and age of damage was recorded. The inventory was carried out in the same way as in 2011 and 2012, but with the addition that damaged wind-felled trees were included. During 2013 also the variable Edge time was introduced, i. e. when a stand edge within 25 m from plot center occurred. In total 93 plots and 330 trees and 118 wind-felled trees was measured. Some assessed and used variables: At sample plot level: Plot area measured The proportion of spruce at the sample plot Maturity class At tree level: Is the tree dead or alive? Position of tree – standing, wind thrown, stump Diameter at breast height Which species of bark beetle has attacked the tree? Which season did the damage occur? Tree volume At wind-felled tree level: Diameter at breast height Is the tree infested by bark beetle? Which species of bark beetle has attacked the tree? Which season did the tree fell? Tree volume See the document "Data_description" for more detailed information. As additional documentation, field instructions for the inventories are also provided, both for the specific inventory and for the National Forest Inventory (NFI). An English version of the National Forest Inventory field instruction is available for year 2021 only, which is why this is included here. Mon, 03 Feb 2025 14:33:44 GMT https://researchdata.se/en/catalogue/dataset/2024-626 https://researchdata.se/en/catalogue/dataset/2024-626 Swedish University of Agricultural Sciences Sören Wulff Cornelia Roberge Target-tailored forest damage inventories (TFDI) aiming at providing data for operational decision making at local level and linked to specific damage events, are undertaken by the Swedish University of Agricultural Sciences. TDFIs are developed to give a rapid response to requested information on specific damage outbreaks. The TDFIs are carried out in limited and concentrated samples, with flexible but robust methods and design. During 2007, TFDI carried out a sample inventory of resin top disease (Cronartium flaccidum) in young forest in northern Sweden (county of Norrbotten coastal area). The purpose of the inventory was to estimate the area of damaged young forest, but also to highlight the geographical distribution and the appearance of the damage on different types of forest sites and in different types of regeneration. The inventory was stratified by using data from the Swedish Forest Agency's moose grazing inventory (ÄBIN). In total 112 forest stands were inventoried. Within each stand, 8 circular sample plots with a radius of 3.5 m were inventoried. All trees in the sample plots were counted and all trees infected by resin top disease both dead and alive were noted. Some assessed and used variables: Tree species proportion Number of tees Number of infected alive trees Number of infected dead trees Altitude Vegetation type See the document "Data_description" for more detailed information. As additional documentation, field instructions for the inventories are also provided. Mon, 29 Apr 2024 12:58:13 GMT https://researchdata.se/en/catalogue/dataset/2023-127-1 https://researchdata.se/en/catalogue/dataset/2023-127-1 Swedish University of Agricultural Sciences Sören Wulff Cornelia Roberge Inventories of forest damage are carried out within the Swedish University of Agricultural Sciences (SLU) Forests programme. An annual monitoring of the most important sources of forest damage is carried out by the Swedish National Forest inventory (NFI). Although the Swedish NFI is an objective and uniform inventory of forest damage in Swedish forests at national and regional scales, less common or less widespread occurrences of forests pests and pathogens are difficult to survey solely through large-scale monitoring programmes. There is a need for complementary inventories to facilitate timely delivery of relevant information. Thus Target-tailored forest damage inventories (TFDI) aiming at providing data for operational decisions making at local level, and linked to specific damage events were introduced. TFDI’s are developed to give rapid response to requested information of specific damage outbreaks. The TFDIs are carried out in limited and concentrated samples, with flexible but robust methods and design. The data collected in the TFDI shall also be of such quality that it can be useful in research. During 2022 TFDI carried out a sample inventory of the volume Norway spruce (Picea abies) damage by European spruce bark beetle (Ips typographus) in older spruce forest in the region of Götaland excluding Gotland and Svealand excluding Dalarna. This as a follow-up to the extremely hot and dry summer in 2018, which resulted in many drought stressed spruce trees that favored the spruce bark beetle. The spruce bark beetle populations, which were already high before, increased rapidly and have in recent years caused extensive damage to spruce in Götaland och Svealand. This year´s inventory is a follow-up to the inventories carried out in 2020 and 2021. The inventory includes both standing infested trees as well as infested wind-felled trees and stumps from felled infested trees. The purpose of the inventory was to estimate the volume Norway spruce damage by the given bark beetles, but also to highlight geographical distribution and the appearance of the damage in different forest sites. The results from the inventory should be available for decisions making basis in forestry managements. The inventory was stratified by an objective sample of all the National Forest Inventory permanent sample plots in Götaland and Svealand. Included plots within the sample was all older thinning forest and final felling mature forest consisting of at least 7/10 proportion of spruce. For the selection of plots LPM (local pivotal method, Grafström et al) is used where the selection was spread based on the geographical position and the spruce volume of the sample plots. The radii of sample plots used for the damage inventory was 20 m, the area which was included for the described site. This means that the inventoried area was smaller than during the 2020 inventory, when the radius was 25 m. Other parts of the plot were not included in the inventory. The inventory in 2022 includes both trees with fresh infestations (season 0) and trees infested last year (season 1) by the spruce bark beetle. Diameter at breast height was measured on damage trees and wind-felled trees. Diameter on stump from cut trees with fresh damage was measured. In 2022, the sample was expanded in order to possibly provide reliable estimates at the county level. The dataset consist at plot level of 1310 rows with 28 column, at tree level (season 0) of 509 rows with 16 columns and at tree level (season 1) of 446 rows with 12 columns. Data on inventory date has been lost. The content and scope of the inventory has been developed in consultation with Swedish Forest Agency. References: Grafström, A., Lundström, N., & Schelin, L. Spatially Balanced Sampling through the Pivotal Method. Biometrics, 68(2), 514-520. https://doi.org/10.1111/j.1541-0420.2011.01699.x Some assessed and used variables: At sample plot level: Plot area measured The proportion of spruce at the sample plot Maturity class Number of infested trees Logging Sanitation At tree level season 0: Is the tree dead or alive? Position of tree – standing, wind-felled, stump Diameter at breast height Tree volume At tree level season 1: Diameter at breast height Tree volume See the document "Data_description" for more detailed information. As additional documentation, field instructions for the inventories are also provided, both for the specific inventory and for the National Forest Inventory (NFI). An English version of the National Forest Inventory field instruction is available for year 2021 only, which is why this is included here. Mon, 15 Dec 2025 10:32:27 GMT https://researchdata.se/en/catalogue/dataset/2025-363 https://researchdata.se/en/catalogue/dataset/2025-363 Swedish University of Agricultural Sciences Sören Wulff Cornelia Roberge Inventories of forest damage are carried out within the Swedish University of Agricultural Sciences (SLU) Forests programme. An annual monitoring of the most important sources of forest damage is carried out by the Swedish National Forest inventory (NFI). Although the Swedish NFI is an objective and uniform inventory of forest damage in Swedish forests at national and regional scales, less common or less widespread occurrences of forests pests and pathogens are difficult to survey solely through large-scale monitoring programmes. There is a need for complementary inventories to facilitate timely delivery of relevant information. Thus Target-tailored forest damage inventories (TFDI) aiming at providing data for operational decisions making at local level, and linked to specific damage events were introduced. TFDI’s are developed to give rapid response to requested information of specific damage outbreaks. The TFDIs are carried out in limited and concentrated samples, with flexible but robust methods and design. The data collected in the TFDI shall also be of such quality that it can be useful in research. During 2020 TFDI carried out a sample inventory of the volume Norway spruce (Picea abies) damage by European spruce bark beetle (Ips typographus) in older spruce forest in the region of Götaland and Svealand excluding Gotland and Dalarna. This as a follow-up to the extremely hot and dry summer in 2018, which resulted in many drought stressed spruce trees that favored the spruce bark beetle. The spruce bark beetle populations, which were already high before, increased rapidly and have in recent years caused extensive damage to spruce in Götaland och Svealand. The inventory includes both standing infested trees as well as infested wind-felled trees and stumps from felled infested trees. The purpose of the inventory was to estimate the volume Norway spruce damage by the given bark beetles, but also to highlight geographical distribution and the appearance of the damage in different forest sites. The results from the inventory should be available for decisions making basis in forestry managements. The inventory was stratified by an objective sample of all the National Forest Inventory permanent sample plots in Götaland and Svealand. Included plots within the sample was all older thinning forest and final felling mature forest consisting of at least 7/10 proportion of spruce. For the selection of plots LPM (local pivotal method, Grafström et al 2012) is used where the selection was spread based on the geographical position and the spruce volume of the sample plots. The radii of sample plots use for the damage inventory was 25 m, the area which was included for the described site. Other parts of the plot were not included in the inventory. The inventory only includes trees with fresh infestations (season 0) from infestations of the spruce bark beetle. Diameter at breast height was measured on damage trees and wind-felled trees. Diameter on stump from cut trees with fresh damage was measured. The dataset consist at plot level of 653 rows with 30 column, at tree level of 621 rows with 16 columns. The content and scope of the inventory has been developed in consultation with Swedish Forest Agency. References: Grafström, A., Lundström, N., & Schelin, L. (2012). Spatially Balanced Sampling through the Pivotal Method. Biometrics, 68(2), 514-520. Retrieved December 1, 2020, from https://doi.org/10.1111/j.1541-0420.2011.01699.x Some assessed and used variables: At sample plot level: Plot area measured The proportion of spruce at the sample plot Maturity class Number of infested trees Logging Sanitation At tree level: Is the tree dead or alive? Position of tree – standing, wind-felled, stump Diameter at breast height Tree volume See the document "Data_description" for more detailed information. As additional documentation, field instructions for the inventories are also provided, both for the specific inventory and for the National Forest Inventory (NFI). An English version of the National Forest Inventory field instruction is available for year 2021 only, which is why this is included here. Mon, 29 Sep 2025 13:02:35 GMT https://researchdata.se/en/catalogue/dataset/2025-168 https://researchdata.se/en/catalogue/dataset/2025-168 Swedish University of Agricultural Sciences Sören Wulff Cornelia Roberge Inventories of forest damage are carried out within the Swedish University of Agricultural Sciences (SLU) Forests programme. An annual monitoring of the most important sources of forest damage is carried out by the Swedish National Forest inventory (NFI). Although the Swedish NFI is an objective and uniform inventory of forest damage in Swedish forests at national and regional scales, less common or less widespread occurrences of forests pests and pathogens are difficult to survey solely through large-scale monitoring programmes. There is a need for complementary inventories to facilitate timely delivery of relevant information. Thus Target-tailored forest damage inventories (TFDI) aiming at providing data for operational decisions making at local level, and linked to specific damage events were introduced. TFDI’s are developed to give rapid response to requested information of specific damage outbreaks. The TFDIs are carried out in limited and concentrated samples, with flexible but robust methods and design. The data collected in the TFDI shall also be of such quality that it can be useful in research. During 2021 TFDI carried out a sample inventory of the volume Norway spruce (Picea abies) damage by European spruce bark beetle (Ips typographus) in older spruce forest in the region of Götaland excluding Gotland and Svealand excluding Dalarna. This as a follow-up to the extremely hot and dry summer in 2018, which resulted in many drought stressed spruce trees that favored the spruce bark beetle. The spruce bark beetle populations, which were already high before, increased rapidly and have in recent years caused extensive damage to spruce in Götaland och Svealand. This year´s inventory is a follow-up to the inventory carried out in 2020. The inventory includes both standing infested trees as well as infested wind-felled trees and stumps from felled infested trees. The purpose of the inventory was to estimate the volume Norway spruce damage by the given bark beetles, but also to highlight geographical distribution and the appearance of the damage in different forest sites. The results from the inventory should be available for decisions making basis in forestry managements. The inventory was stratified by an objective sample of all the National Forest Inventory permanent sample plots in Götaland and Svealand. Included plots within the sample was all older thinning forest and final felling mature forest consisting of at least 7/10 proportion of spruce. For the selection of plots LPM (local pivotal method, Grafström et al) is used where the selection was spread based on the geographical position and the spruce volume of the sample plots. The radii of sample plots used for the damage inventory was 20 m, the area which was included for the described site. This means that the inventoried area was smaller than during the 2020 inventory, when the radius was 25 m. Other parts of the plot were not included in the inventory. The inventory in 2021 includes both trees with fresh infestations (season 0) and trees infested last year (season 1) by the spruce bark beetle. Diameter at breast height was measured on damage trees and wind-felled trees. Diameter on stump from cut trees with fresh damage was measured. The dataset consist at plot level of 711 rows with 28 column, at tree level (season 0) of 399 rows with 16 columns and at tree level (season 1) of 270 rows with 12 columns. Data on inventory date has been lost. The content and scope of the inventory has been developed in consultation with Swedish Forest Agency. References: Grafström, A., Lundström, N., & Schelin, L. Spatially Balanced Sampling through the Pivotal Method. Biometrics, 68(2), 514-520. Retrieved December 1, 2020, from https://doi.org/10.1111/j.1541-0420.2011.01699.x Some assessed and used variables: At sample plot level: Plot area measured The proportion of spruce at the sample plot Maturity class Number of infested trees Logging Sanitation At tree level season 0: Is the tree dead or alive? Position of tree – standing, wind-felled, stump Diameter at breast height Tree volume At tree level season 1: Diameter at breast height Tree volume See the document "Data_description" for more detailed information. As additional documentation, field instructions for the inventories are also provided, both for the specific inventory and for the National Forest Inventory (NFI). Fri, 07 Nov 2025 13:30:50 GMT https://researchdata.se/en/catalogue/dataset/2025-282 https://researchdata.se/en/catalogue/dataset/2025-282 Swedish University of Agricultural Sciences Sören Wulff Cornelia Roberge Inventories of forest damage are carried out within the Swedish University of Agricultural Sciences (SLU) Forests programme. An annual monitoring of the most important sources of forest damage is carried out by the Swedish National Forest inventory (NFI). Although the Swedish NFI is an objective and uniform inventory of forest damage in Swedish forests at national and regional scales, less common or less widespread occurrences of forests pests and pathogens are difficult to survey solely through large-scale monitoring programmes. There is a need for complementary inventories to facilitate timely delivery of relevant information. Thus Target-tailored forest damage inventories (TFDI) aiming at providing data for operational decisions making at local level, and linked to specific damage events were introduced. TFDI’s are developed to give rapid response to requested information of specific damage outbreaks. The TFDIs are carried out in limited and concentrated samples, with flexible but robust methods and design. The data collected in the TFDI shall also be of such quality that it can be useful in research. During 2023 TFDI carried out a sample inventory of the volume Norway spruce (Picea abies) damage by European spruce bark beetle (Ips typographus) and/or damage by Four eyed spruce bark beetle (Polygraphus poligraphus) in older spruce forest. The inventory were conducted in the region of eastern Götaland (county of Östergötland, Kronoberg, Kalmar and Blekinge) and in Svealand in the county Södermanland, Örebro, Västmanland, Stockholm, Uppsala, Värmland and southern part of Dalarnas (municipality of Ludvika, Avesta, Hedemora, Falun, Smedjebacken, Leksand, Gagnef och Vansbro) and in the southern part of Gävleborgs region (Gästrikland). This as a follow-up to the extremely hot and dry summer in 2018, which resulted in many drought stressed spruce trees that favored the spruce bark beetle. The spruce bark beetle populations, which were already high before, increased rapidly and have in recent years caused extensive damage to spruce in Götaland och Svealand. This year´s inventory is a follow-up to the inventories carried out in 2020, 2021 and 2022. The inventory includes both standing infested trees as well as infested wind-felled trees and stumps from felled infested trees. The purpose of the inventory was to estimate the volume Norway spruce damage by the given bark beetles, but also to highlight geographical distribution and the appearance of the damage in different forest sites. The results from the inventory should be available for decisions making basis in forestry managements. The inventory was stratified by an objective sample of all the National Forest Inventory permanent sample plots in Götaland and Svealand. Included plots within the sample was all older thinning forest and final felling mature forest consisting of at least 7/10 proportion of spruce. For the selection of plots LPM (local pivotal method, Grafström et al) is used where the selection was spread based on the geographical position and the spruce volume of the sample plots. The radii of sample plots used for the damage inventory was 20 m, the area which was included for the described site. This means that the inventoried area was smaller than during the 2020 inventory, when the radius was 25 m. Other parts of the plot were not included in the inventory. The inventory in 2023 includes both trees with fresh infestations (season 0) by the European spruce bark beetle and/or damage by Four eyed spruce bark beetle and trees infested last year (season 1) by the European spruce bark beetle. Diameter at breast height was measured on damage trees and wind-felled trees. Diameter on stump from cut trees with fresh damage was measured. From 2022, the sample was expanded in order to possibly provide reliable estimates at the county level. In 2023, the inventory was limited to the eastern parts of Götaland, as previous years' inventories showed declining damage in western Götaland. However, the area in the north was expanded to include southern Dalarna and southern Gävleborg counties after indications of increased damage in these areas. In 2023, fresh infestations by the four eyed spruce bark beetle were also included after reports of increased damage by this bark beetle species as well. The dataset consist at plot level of 1142 rows with 28 columns, at tree level (season 0) of 292 rows with 16 columns and at tree level (season 1) of 350 rows with 12 columns. The content and scope of the inventory has been developed in consultation with Swedish Forest Agency. References: Grafström, A., Lundström, N., & Schelin, L. Spatially Balanced Sampling through the Pivotal Method. Biometrics, 68(2), 514-520, https://doi.org/10.1111/j.1541-0420.2011.01699.x Some assessed and used variables: At sample plot level: Plot area measured The proportion of spruce at the sample plot Maturity class Number of infested trees Logging Sanitation At tree level season 0: Is the tree dead or alive? Position of tree – standing, wind-felled, stump Diameter at breast height Tree volume At tree level season 1: Diameter at breast height Tree volume See the document "Data_description" for more detailed information. As additional documentation, field instructions for the inventories are also provided, both for the specific inventory and for the National Forest Inventory (NFI). An English version of the National Forest Inventory field instruction is available for year 2021 only, which is why this is included here. Thu, 16 Apr 2026 14:52:10 GMT https://researchdata.se/en/catalogue/dataset/2026-71 https://researchdata.se/en/catalogue/dataset/2026-71 Swedish University of Agricultural Sciences Sören Wulff Cornelia Roberge