[Alternatives to chemical control in Swedish cereal production]

agricultura alternativa agriculture alternative alternative farming cereal crops chemical control cultivos de cereales enfermedades de las plantas enfermedades fungosas environmental impact fitomejoramiento fongicide fungal diseases fungicidas fungicides herbicidas herbicide herbicides impact sur l'environnement impacto ambiental insecte nuisible insecticidas insecticide insecticides integrated control lucha integrada lutte chimique maladie des plantes maladie fongique malezas mauvaise herbe pest insects pests of plants plagas de plantas plant breeding plant diseases plant protection protection des plantes ravageur des plantes resistance to injurious factors suecia sweden weeds