Herbicide trials in North Cameroon: recent results and development prospects.
The results of 56 field trials set up in N. Cameroon in 1988, to test the effects of 18 herbicides, applied pre- and post-em. to weeds in 4 crops (cotton, maize, sorghum and groundnuts), grown on 5 sites of different soil and floristic composition, were reported. The weed flora totalled 117 species; the most common were Leucas martinicensis, Ipomoea eriocarpa and Commelina benghalensis, but Rottboellia cochinchinensis and Cyperus rotundus were problematic in localized areas. Of the products tested, diethatyl-ethyl + fluometuron (Diflucal) in cotton, atrazine + metolachlor ± glyphosate (Primextra and Primagram Extra, resp.) and ABIDM 01 in maize, resulted in the best overall weed control. None controlled R. cochinchinensis or [Cassia] obtusifolia well, only those containing chlorotriazines were effective against C. benghalensis and 3 (diuron + fluometuron (Fluorone), propazine + terbuthylazine (Propagard) and atrazine + linuron (CAL H 8900)) resulted in reasonable control of I. eriocarpa.