Susceptibility assessment and mapping of Ips typographus (L.) (Coleoptera: Curculionidae) in oriental spruce forests in Artvin, Turkey
Künye
Alkan Akıncı, H., Genç, Ç., & Akıncı, H. (2022). Susceptibility assessment and mapping of Ips typographus (L.) (Coleoptera: Curculionidae) in oriental spruce forests in Artvin, Turkey. Journal of Applied Entomology, 146(9), 1185–1199.Özet
Ips typographus, which was first identified in 1984 in the oriental spruce forests of
Artvin, Turkey, has killed millions of cubic metres of trees. Severe outbreaks of I. typographus following storms resulting in fallen trees and salvage logging done as a part
of control activities have caused gaps in the stand canopy of oriental spruce forests.
These forests, which have many important functions, such as supplying water, soil
conservation and preventing natural disasters in the area they spread, have a fragmented structure because of beetle damages and various traditional utilization practices of the local community. In this study, the local spread of I. typographus in the
forests of Hatila Valley National Park and the neighbouring Taşlıca Forest Sub-District
was evaluated, and the areas susceptible to the beetle were determined using the
frequency ratio method. A total of 120 pheromone traps were employed in the study.
A beetle density map of the study area was produced using the inverse distance
weighting interpolation method based on the total number of beetles caught by the
traps. Then, the correlation between the regions with high I. typographus density and
environmental factors that contributed to this situation were determined using the
frequency ratio method. An average 6528.70 beetles were caught by the pheromone
traps as a result of this study. The density of the beetles was high in 60.64% of the
study area, and an average 10,844.25 beetles were caught by the pheromone traps
in these areas. The difference in the total number of beetles between areas with high
beetle density and those with low or medium beetle density was significant. It was
determined that 32.53% of the study area had very high or high susceptibility to I.
typographus. Different parameters such as altitude, slope, aspect, distance to forest
roads, stand type, topographic wetness index and area solar radiation were found to
be associated with the susceptibility of an area to I. typographus.