FLORISTIC-AGRONOMIC ASPECTS OF WEEDS IN T HE LOUKKOS REGION OF MOROCCO

One-hundred and twenty fields of cereals, legumes and sugar beet were surveyed by stratified sampling in the Loukkos region (north-west Moro cco). In total, 244 weed species belonging to 37 plant families were r ecorded. Three families, the Asteraceae, Fabaceae and Poaceae accounte d for 41.8% of the species. Dicotyledons (82.3%), annuals (82.8%) and the mediterranean floristic element (63.9) were predominant and charac terized the weed flora. The agronomic study made it possible to distin guish 45 species causing appreciable problems to the crops surveyed. T he weeds common to the three types of crop comprised 51.5%, 56.6% and 60.7% of the problem species in sugar beet, cereals and legumes, respe ctively.