Species of weeds of importance in cotton producing areas of Nicaragua.
Weed populations were identified and their abundance was determined in the major cotton-producing areas of Nicaragua during 1989-90. Species were ordered according to relative frequency (RF), relative density (RD) and importance index (Ii) values. Based on RF and Ii values, the following weed species were the most problematic: Cyperus rotundus, Digitaria spp., Emilia sonchifolia, Malvastrum americanum, Ixophorus unisetus, Tridax procumbens and Eleusine indica. The most important weed species according to RD values were Desmodium scorpiurus, Ipomoea spp., Cynodon dactylon, Rhynchosia minima and Abutilon crispum.