Weed survey of faba bean fields in Syria with special reference to Orobanche spp. and Cuscuta spp.
In a survey of weeds in faba bean fields in Syria in 1986, crops were studied along the river Euphrates from Ragga to Abu Kamal and NE of Aleppo (Kafr Antoon, Al Bab and Kuwayres). A total of 38 fields was checked for Orobanche and Cuscuta spp. and 23 fields were surveyed for the general weed flora. The frequency of O. crenata, O. aegyptiaca and Cuscuta spp. NE of Aleppo was 71, 76 and 55%, resp.; only Cuscuta spp. were found in the Euphrates valley. Of the other weed species surveyed, Melilotus indica and Convolvulus arvensis had the highest frequencies in the Euphrates area and NE of Aleppo, resp. Av. cover in the 2 study areas was greatest for M. indica (17.6%) and O. crenata (3.2%), resp.