Difficult weeds in Kenya coffee - a review.
Weed problems in coffee in Kenya are reviewed. Weeds classified as difficult to control are identified, including Digitaria scalarum [D. abyssinica], Cyperus rotundus, Oxalis spp., Pennisetum clandestinum and Cynodon dactylon. Problems of herbicide resistance are discussed with reference to Parthenium hysterophorus, Commelina benghalensis and Bidens pilosa. The weed status of each species is described and methods of control are discussed.