1-Methylcyclohex-2-en-1-ol as an aggregation pheromone ofDendroctonus pseudotsugae.

Area of Science:

• Chemical Ecology
• Insect Behavior
• Organic Synthesis

Background:

• Volatile compounds play crucial roles in insect communication.
• Pheromones mediate aggregation behavior in many insect species.
• Understanding insect semiochemicals is vital for pest management.

Purpose of the Study:

• To synthesize and identify 1-Methylcyclohex-2-en-1-ol (1,2-MCH-ol) as a potential aggregation pheromone.
• To investigate the behavioral responses of Douglas-fir beetles to synthetic 1,2-MCH-ol.
• To correct and present accurate mass spectra for candidate compounds.

Main Methods:

• Synthesis of 1-Methylcyclohex-2-en-1-ol (1,2-MCH-ol) and 3,3-MCH-ol.
• Gas chromatography (GC) and mass spectrometry (MS) for compound identification and characterization.
• Bioassays using olfactory walkways and pheromone traps to assess beetle responses.

Main Results:

• 1,2-MCH-ol was identified as a volatile released by female Douglas-fir beetles.
• Synthetic 1,2-MCH-ol elicited significant arrestment and stridulation responses in males.
• Increased trap catches of flying beetles were observed with synthetic 1,2-MCH-ol.
• Males exhibited a stronger response to 1,2-MCH-ol compared to females.

Conclusions:

• 1,2-MCH-ol functions as an aggregation pheromone in Douglas-fir beetles.
• Synthetic 1,2-MCH-ol can be used to manipulate beetle behavior for monitoring or control.
• Accurate spectral data for insect semiochemicals is essential for identification.