It has been demonstrated that the curative applications of the entomopathogenic nematode Steinernema carpocapsae in a chitosan formulation can reduce the population of red palm weevil, Rhynchophorus ferrugineus infesting Cretan Date Palm, Phoenix theophrasti (Dembilio et al., 2011). Read following papers for more information.
Dembilio, O., Karamaouna, F., Kontodimas, D. C., Nomikou, M. and Jacas, J. A. 2011. Short communication. Susceptibility of Phoenix theophrasti (Palmae: Coryphoideae) to Rhynchophorus ferrugineus (Coleoptera: Curculionidae) and its control using Steinernema carpocapsae in a chitosan formulation. Spanish Journal of Agricultural Research 9: 623-626.
Dembilio, O., Llacer, E., de Altube, M.D.M. and Jacas, J.A. 2010. Field efficacy of imidacloprid and Steinernema carpocapsae in a chitosan formulation against the red palm weevil Rhynchophorus ferrugineus (Coleoptera: Curculionidae) in Phoenix. Pest Management Science 66: 365-370.