First of all, chemical mediators are known for H. consanguinosa (please refer to "Identification of the chemical mediating attraction of Holotrichia consanguinea beetles to its most preferred host tree").
Moreover, attraction of imago to host plants is well described (see "Attraction of the beetle, Holotrichia consanguinea Blanchard (Scarabaeidae: Coleoptera) to light and host plant").
However, no efficiency tests made for any of known attraction methods.