Entomological problems of agriculture in the Anglo-egyptian Sudan.

acrididae aerial application agricultura agricultural and rural legislation agriculture aleyrodidae almacenamiento cicadellidae control de insectos control de plagas coton cotton droit agricole et rural entomologia entomologie entomology experimentation heliothis insect control insecte nuisible insecticidas insecticide insecticides lutte antiravageur perte au stockage pest control pest insects projet de recherche research projects spraying state intervention stockage storage storage losses