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DocumentOther documentComparison of flight capability of two Monochamus beetle species (Coleoptera: Cerambycidae) using flight mills
XV World Forestry Congress, 2-6 May 2022
2022Also available in:
No results found.To compare flight capability between males and females of Monochamus alternatus and M. saltuarius, vector insect species for pine wood nematode, a total of 42 adult beetles (25 males and 17 females) for M. alternatus and 42 adult beetles (18 males and 24 females) for M. saltuarius was tested using flight mills. Adult beetles that emerged from Pinus koraiensis logs were tethered on flight mills, and flight distance was measured weekly for entire life span. In each flight session, every tested beetle was tethered on flight mills using insect pin with glue. We only analyzed beetles that flew above 100 m in each flight session. As a result, cumulated flight distance of M. alternatus was longer than that of M. saltuarius. However, the average cumulated flight distances for entire life span was longer in males for two beetle species compared to their females. These results can be used for the estimation of pine wilt disease spread from invaded area to neiboring areas. Keywords: Adaptive and integrated management, Biodiversity conservation, Deforestation and forest degradation ID: 3623055 -
DocumentOther documentA preliminary study on ecological features of two natural enemies against two vectors of pine wilt disease for mass rearing in Korea
XV World Forestry Congress, 2-6 May 2022
2022Also available in:
No results found.Two species of the genus Monochamus (Coleoptera: Cerambycidae), M. alternatus and M. saltuarius are well-known as vectors of the pine wilt disease and they causes economically damages in South Korea. Among various control methods to reduce the density of vectors, a method by biological control agents (natural enemies) is eco-friendly indispensable. Since 2017, we have carried out the studies on the parasitic natural enemies againt for the vector species and found two parasitoids, Spathius verustus Chao, 1977 (Braconidae) and Cyanopterus flavator (Fabricius, 1793) (Bracondiae), would be a useful agents for biological controls. For accumulation of biological data, we conducted a preliminary study on life span and parasitic rate of two parasitic wasps against for two vector species. As results, we found that S. verustus has the longest adult life span of 33.4±19.2 days (avg.) in M. alternatus (T=30°C, H=60%) and C. flavator has the longest adult life span of 25.1±10.6 days (avg.) in M. alternatus (T=25°C, H=60%). The average parasitic rate (62.5%) of S. verustus was highest in M. alternatus (T=30°C, H=60%). In addition, it is confirmed that the offsprings of S. verustus can be made by parthenogenetic reproducton. Keywords: Research ID: 3622037 -
DocumentOther documentEffects of different management models on soil organic carbon of natural secondary forests of Quercus Mongolica in China
XV World Forestry Congress, 2-6 May 2022
2022Also available in:
No results found.How to improve soil organic carbon content and stock has become the emerging scientific issues under the background of low soil fertility of natural secondary forests in Northeast China. In this study,, we will analyze the impacts of natural restoration management regime, target tree-based forest management regime, and conversion to mixed local valuable broadleaved forest management regime for secondary Quercus mongolica forest on soil organic carbon stocks in a forestry fram of Heilongjiang province. The result showed: (1) SOC content ranked as target tree-based forest management ＞ natural restoration management ＞ conversion to mixed local forest management, and TN,TP, AN, AP and water content were the key factors impacted the SOC content; (2) The different management have no impact on cfPOC and MOC, but the ffPOC content was significantly decreased under target tree-based forest management, while iPOC content was significantly increased under conversion to mixed local forest management; (3) The relative proportion of the functional groups were ranked as O-alkyl C > alkyl C > aromatic C > carbonyl C; (4) MBC was rankded as target tree-based forest management ＞ natural restoration management ＞ conversion to mixed local forest management, and the invertase activity and catalase activity were increased under target tree-based forest management, while urease activity was increased under conversion to mixed local forest management; (5) The carbon sequestration potential was ranked as conversion to mixed local forest management ＞ natural restoration management ＞ target tree-based forest management. In conclusion, these results indicated that the target tree-based forest management has the highest potential to sequestrated carbon in forest soil, and it is a rational management to increase SOC, while conversion to mixed local forest management lead to a loss of SOC and need to protect and repair in future to increase the SOC content. Keywords: Sustainable forest management, Deforestation and forest degradation, Deforestation and forest degradation; Adaptive and integrated management, Policies ID: 3486596
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