[Information meeting in plant protection 1997. Scientific meeting in cereals]

agricultural warning services avertissement agricole crops cultivos diffusion de la recherche diffusion of research disorders enfermedades de las plantas extension extension activities maladie des plantes malezas mauvaise herbe monitoring noruega norway pests of plants plagas de plantas plant diseases plant protection plante de culture protection des plantes ravageur des plantes trastornos trouble vigilancia vulgarisation weeds