ZLV Online

Abstrakt

Presented study verifies the attractiveness of trap trees for Ips duplicatus. Five variants of trap trees were tested in 2016: (L1) covered (covered with cut branches), not underlaid, (L2) covered, underlaid, (L3) not covered, not underlaid, (L4) not covered, underlaid, and (L5) trap tree with no cut branches. All these variants were installed on five localities on each of two forest districts (Třebíč and Opava, the areas with long-term high population density of Ips duplicatus) during the second half of March. Trap trees infestations were evaluated at the end of May and the beginning of June. Particular galleries of Ips duplicatus were calculated on each of four 50cm wide debarked sections of each trunk: (i) at the distance up to 3 m from the trunk bottom, (ii) halfway between the first section and the beginning of the crown, (iii) at the beginning of the crown, and (iv) in the middle of the crown trunk part. The results showed that the trap trees infestation density (regardless of the trap tree variant) was very low, if any, even though the population density of Ips duplicatus was very high in both studied forest districts. Our study confirmed previous results of similar studies of other authors, which is that Ips duplicatus infests the laying wood exceptionally or not at all, and utilization of trap trees for this bark beetle species is not effective, even in areas with high population density. For more information see Summary at the end of the article.