Distribution and density of weeds in chickpea cultivation areas in Diyarbakır province in Turkey.
No prior research has been conducted on the weeds present in chickpea crops in Diyarbakır Province. Research was carried out in Diyarbakır and neighbouring areas (Centre, Bismil, Çermik, Çınar, Ergani, Hazro, Kocaköy and Silvan) in 1998 to identify problematic weeds, their densities and frequencies. 21 monocotyledon species belonging to 29 genera were identified and 112 dicotyledon species were detected. Common chicory (Cichorium intybus) was an important species, since its density throughout the Diyarbakır province was more than 1 plant/m2. Rough bedstraw (Galium tricornutum), charlock (Sinapis arvensis), winter wild oat (Avena sterilis), field bindweed (Convolvulus arvensis), tumble pigweed (Amaranthus albus), cow cockle (Vaccaria pyramidata [V. hispanica]), sickle spurge (Euphorbia falcata), spurge (Euphorbia sp.), great bur parsley (Turgenia latifolia), persian darnel (Lolium persicum), shattercane (Sorghum halepense) and timothy grass (Phleum boissieri) were of local importance.