Lettuce 



Pre-emergence. - -Experiments in Arizona have shown CDEC at 5 to 7-1/2 

 pounds per acre to be effective for control of purslane in head lettuce without 

 injury to the crop. CIPC at 1 to 3 pounds in 10 to 40 gallons of water will con- 

 trol annual weeds. 



Onions 



(1) Pre -emergence . - -For control of a wde variety of annual grasses and 

 broadleaved weeds: A light aromatic oil emulsion at 40 to 80 gallons per 

 acre, 3- to 5-percent solution of sulfuric acid in water at 100 gallons per 

 acre, or CIPC at 2 to 8 pounds per acre applied when weeds are in seedling 

 stage but before the emergence of onions. Combinations of CIPC and light 

 aromatic oils will effectively control smartweed and purslane. 



For control of annual weeds in onion seed crops: Monuron at 1 to 2 pounds 

 per acre or CIPC at 6 to 12 pounds per acre applied immediately after the 

 mother bulbs are planted in early spring or before new growth begins from 

 overwintered bulbs. 



(2) Post -emergence . - -For control of most annual w^eeds in onions in the 

 loop stage: 2- to 3-percent solution of sulfuric acid in water at 100 gallons 

 per acre, or KOCN at 10 to 16 pounds in 50 to 100 gallons of water per acre, 

 applied when first true leaf of onions is at least 2 to 3 inches long (loop 

 stage). 



For control of most annual weeds in onions in the 5 -leaf stage or early 

 bolting stage, and after last cultivation when onions are being, or have been, 

 laid by and are bulbing or bolting: CIPC at 2 to 8 pounds, KOCN at 16 to 20 

 pounds, monuron at 1 to 2 pounds, or sesone at 2 to 4 pounds, in 20 to 40 

 gallons of w^ater per acre, or a 3- to 4-percent solution of sulfuric acid in 

 water at 100 gallons per acre applied so as to miss the plant except at the 

 base. Avoid hitting tops of onion plants. The KOCN and sulfuric acid sprays 

 should be delayed until seedling weeds emerge follow^ing the last cultivation 

 of onions. 



Comments and precautions . --Chemical and rate of application to use 

 ■will be determined by weeds present, rainfall pattern (summer or winter), 

 soil type, and stage of growth of onions and weeds; for example, only 

 monuron or sesone are effective in seed onions in Western low-summer - 

 rainfall areas. 



Peas 



(1) Preplanting . --For control of wild oats and other grasses in Inter- 

 mountain region: IPC at 3 to 6 pounds in 10 to 40 gallons of water per acre 

 applied to the soil, and thoroughly disked into soil surface 2 to 4 weeks before 

 planting. 



(2) Pre-emergence . --For control of annual weeds in Northeastern States : 

 Any one of several amine salts of DNBP at 4 to 6 pounds in 10 to 20 gallons 

 of water per acre. 



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