Relative unpalatability of leaf beetles with either biosynthesized or sequestered chemical defence

alcaloides alkaloids allomone allomones alomonas biochemistry biochimie chrysomelidae coleoptera defensive secretions depredadores enemigos naturales ennemi naturel esteroides insecte nuisible lactonas lactone lactones natural enemies passeriformes pest insects pests of plants plagas de plantas predation predators prey ravageur des plantes secretion steroids