Scored as percentage infection from a specific trial to induce disease or insect infestation, under conditions which are clearly specified. In each case, it is important to state the origin of the infestation or infection, i.e., natural, field inoculation, laboratory. Given the general nature of these descriptors covering a large number of grass species, an indicative list of common pathogens and insect pests are provided. Users should select those with economic impact or add additional ones relevant for the grass species being characterized and the production environment.