 This weevil's host plant is "Aciphylla dieffenbachii" Kirk (coxella or Dieffenbach's speargrass), a soft-leaved relative of the spine-bearing alpine "Aciphylla" of the New Zealand mainland.Adults make a characteristic oval feeding notch on the leaf petiole, sometimes scraping away the leaf to encourage to production of gum.Green seeds and flowers of coxella are eaten, with a preference for male flowers.