CHEMICAL WEED-CONTROL IN GARLIC (ALLIUM-SATIVUM L) IN JORDAN

Field experiments were made in 1992 and 1993 in different locations to study the effect of certain herbicides on weed control in garlic. Pos t-emergence application of oxyfluorfen and oxadiazon at 3-4 leaf stage resulted in garlic yield comparable to the weed-free crop. Pre-plant application of both herbicides was also effective in weed control and increased garlic yield over the other herbicide treatments. Weed bioma ss reduction was up to 55%. However, under rainfed conditions and with a heavy population of wild oat (Avena sterilis L.), only oxyfluorfen increased garlic yield over the weed-infested control. Methabenzthiazu ron applied pre-planting gave consistent results but a lower yield tha n oxyfluorfen or oxidiazon. Results with pendimethalin applied pre-pla nting varied between season and between locations. Other herbicides te sted failed to control weeds effectively or were phytotoxic to the cro p.