[Field distribution of the cereal aphid Rhopalosiphum padi and the importance for prognosis [Sweden]]

afidos agentes nocivos animal animal nuisible animales animales nocivos animals aphide aphids arthropode arthropods cereales cereals crops cultivos cultivos de grano dynamique des populations economic plants escandinavia europa europe facteur nuisible forecasting grain crops hemiptera homoptera injurious factors insecte insecte nuisible insectos insects invertebrados invertebrates methode methods noxious animals organisme nuisible pest insects pests plagas plantas plante plante de culture plants population population dynamics rhopalosiphum scandinavia scandinavie suecia sweden