Kairomone response inThanasimus predators to pheromone components ofIps typographus

Area of Science:

• Chemical ecology
• Insect behavior
• Pest management

Background:

• Bark beetles, particularly of the genus Ips, utilize specific pheromone components for communication.
• Understanding these chemical signals is crucial for developing effective pest management strategies.

Purpose of the Study:

• To investigate the olfactory response of Thanasimus formicarius and Thanasimus femoralis to key pheromone components of Ips bark beetles.
• To determine if synergistic effects occur when these pheromone components are presented in combination.

Main Methods:

• Behavioral assays were conducted using racemic ipsdienol, ipsenol, (S)-cis-verbenol, and methylbutenol.
• Responses of T. formicarius and T. femoralis were recorded individually and in various combinations.

Main Results:

• Thanasimus formicarius responded significantly to ipsdienol and ipsenol, with a lesser response to (S)-cis-verbenol.
• Methylbutenol alone did not elicit a response from T. formicarius, but it synergized responses when combined with cis-verbenol and ipsdienol.
• (S)-cis-verbenol elicited a response in Thanasimus femoralis, with ipsdienol and ipsenol acting synergistically.

Conclusions:

• The predatory beetles Thanasimus formicarius and Thanasimus femoralis exhibit differential responses to Ips bark beetle pheromones.
• Synergistic interactions between pheromone components play a significant role in mediating the responses of these predatory insects, impacting their foraging behavior.