The absolute configuration of the sex pheromone of the citrophilous mealybug, Pseudococcus calceolariae
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Published on: August 9, 2024
C Rikard Unelius1, Ashraf M El-Sayed, Andrew Twidle
1The New Zealand Institute for Plant & Food Research Ltd, Canterbury Research Centre, Lincoln, New Zealand. rikard.unelius@lnu.se
Abstract:
The absolute configuration of the sex pheromone of the citrophilous mealybug, Pseudococcus calceolariae, was determined to be (1R,3R)-[2,2-dimethyl-3-(2-methylprop-1-enyl)cyclopropyl]methyl (R)-2-acetoxy-3-methylbutanoate. NMR, derivatization reactions, chiral gas chromatography-mass spectrometry, and comparison with synthetic chiral reference compounds, were used to determine the absolute configuration of this compound. This activity of this compound was further confirmed by testing synthetic stereoisomers of the compound as lures in traps for adult male mealybugs. Traps baited with 1,000 μg of the pheromone compound caught 36 times more males than traps baited with virgin females. A mixture of stereoisomers of the pheromone compound can be used for field trapping without adverse effects on trap catch. A comparison with the structures of other sex pheromones of mealybugs is presented.
