Evaluation of Attractant Composition, Application Rate, and Trap Type for Potential Mass Trapping of Ips typographus (L.)

Abstract

This study focused on elucidating the possibilities of improving current trapping methods for Ips typographus (Linnaeus, 1758). Three field experiments were conducted simultaneously in one study area in the German federal state of Saxony. A comparison of six different commercial attractants revealed a significant superiority of Typosan®, especially for adult beetles after hibernation in the phase of their first swarming. It also attracted fewer individuals of Thanasimus spp. than the other highly attractive products Pheroprax® and IT Ecolure Extra®. Increasing the Pheroprax® application rate by using four instead of one dispenser in a single trap increased the total catch of I. typographus only by 15.5%. In contrast, Thanasimus spp. catch increased by 195.5% when four dispensers were used. A test of different trap types showed a species-specific catching capability, with the 12-funnel WitaTrap® being the most effective in catching I. typographus. The quantity of Thanasimus spp. bycatch in multiple-funnel traps demonstrated the necessity of a selective mechanism to minimize impacts on predator populations. Although we were not able to identify new milestones towards mass trapping, this study contributes to necessary improvements of current trapping methods. Especially in future stands with a smaller share of Norway spruce (Picea abies Karsten, 1881) the weakened beetle population in spring could be effectively reduced by properly conducted mass trapping.

Evaluation of trap type and attractant composition for potential mass trapping of Hylobius abietis

“…This approach has the advantage of balancing different population densities as well as varying trapping periods during the study. Possibly biased analysis results due to very small trapping numbers were avoided by including only collection dates with at least 100 caught individuals (Heber et al, 2021; Helbig & Heber, 2020; Wehnert, 2014; Wehnert & Müller, 2012). Carabidae catch was analysed using absolute values due to the consistently small trapping numbers.…”

“…The design was based on the trap circle methodology, which was also applied in other field studies comparing different attractants and trap types (Heber et al, 2021; Helbig & Heber, 2020; Wehnert, 2014; Wehnert & Müller, 2012). For each trial, five trap circles were set up with a minimum distance of 50 m from each other.…”

Efficiency and Sustainability of Ips duplicatus (Coleoptera: Curculionidae) Pheromone Dispensers with Different Designs

“…When the newly developed dispensers were tested to optimize their composition and construction, the experiments with randomization of several tested baits in traps took place. These experiments had a shorter duration since the qualitative comparison was sufficient when the particular number of randomizations was achieved [34,45,65,67,73,74].…”

Field effects of oxygenated monoterpenes and estragole combined with pheromone on attraction of Ips typographus and its natural enemies

“…These signals enable beetles to locate a mate or host tree by providing intraspecific and interspecific chemical information (Bergström, 2007). Aggregation pheromone components, produced by male beetles after successful colonization (Birgersson et al, 1984;Ramakrishnan et al, 2022), have been employed for monitoring and controlling I. typographus populations (Heber et al, 2021). Furthermore, recent research has focused on the management potential of kairomones, compounds originating from both host spruce trees and non-host trees, e.g., broadleaf trees (Zhang and Schlyter, 2004;Jakuš et al, 2022).…”