Hare, J.D., Millar, J.G., & Luck, R.F. 1993 A caffeic acid ester mediates host recognition by a parasitic wasp.. Naturwissenschaften 80(2): 92-94.

Notes: Abstract: This research demonstrates that a previously unknown ester of caffeic acid and tyrosine, O-caffeoyltyrosine, is a major component of the kairomone from Aonidiella aurantii, that the predator, Aphytis melinus, responds quantitatively to variation in O-caffeoyltyrosine concentration, and that the dose eliciting peak activity by the wasp corresponds with the amount observed in scale covers when scales are most suitable for parasitization by A. melinus.