WEED CONTROL IN ONIONS AND GARLIC Edward A. Kurtz Technical Director Basic American Foods Basic Vegetable Products Division King City, California The control of weeds in onion and garlic is a necessary factor in insuring the successful production of these crops. Although weed control is essential throughout production, two of the most critical periods are during the early season, to reduce competition, and prior to harvest. Weed control at the latter stages of crop production is especially critical on those acres of these crops which are harvested on a mechanical basis. The primary method for controlling weeds in these crops usually involves a combination of cultural and chemical techniques, with the current emphasis being placed on the use of chemicals designed to selectively suppress or elimi­ nate weed populations without impairing the development of the crop. The registration of chemicals for weed control on onions and garlic over the last 4 - 6 years has resulted in new materials becoming available that pro­ vide additional means of maintaining weeds at low population levels throughout the season. The following information is provided to indicate the progress that has been made in this area. PRIMARY REGISTERED HERBICIDES - CALIFORNIA - ONION 1979 1981 1983 DACTHAL DACTHAL DACTHAL (DCPA) (DCPA) (DCPA) BASIC VEGETABLE WEED OIL WEED OIL ONION HERBICIDE (CHLOROXURON) DINITRO SELECT ROUNDUP PARAQUAT ( DINOSEB) (GLYPHOSATE) SULFURIC ACID BASIC VEGETABLE ROUNDUP ONION HERBICIDE (GLYPHOSATE) (CHLOROXURON) TOK DINITRO SELECT BROMINAL (NITROFEN) (DINOSEB) (BROMOXYNIL) SULFURIC ACID BASIC VEGETABLE ONION HERBICIDE ( CHLOROXURON) DINITRO SELECT (DINOSEB) GOAL (OXYFLUORFEN) N-TAC SULFURIC ACID 113 PRIMARY REGISTERED HERBICIDES - CALIFORNIA - GARLIC 1977 1979 1981 1983 DACTHAL DACTHAL DACTHAL DACTHAL ( DCPA) ( DCPA) (DCPA) ( DCPA) FURLOE FURLOE FURLOE FURLOE ( CHLORPROPHAM) (CHLORPROPHAM) (CHLORPROPHAM) (CHLORPROPHAM) DINITRO SELECT BROMINAL/BUCTRIL WEED OIL WEED OIL ( DINOSEB) (BROMOXYNIL) BASIC VEGETABLE BROMINAL/BUCTRIL PARAQUAT ONION HERBICIDE (BROMOXYNIL) (CHLOROXURON) DINITRO SELECT BASIC VEGETABLE BROMINAL/BUCTRIL (DINOSEB) ONION HERBICIDE (BROMOXNYIL) ( CHLOROXURON) TOK DINITRO SELECT BASIC VEGETABLE (NITROFEN) ( DINOSEB) ONION HERBICIDE (CHLOROXURON) DINITRO SELECT ( DINOS EB) N-TAC TREFLAN (TRIFLURALIN) 114 .