IV. WEED CONTROL IN HORTICULTURAL CROPS 



VEGETABLE CROPS 

 Asparagus 



(1) Seedbeds, pre-emergence . --For control of most annual broadleaved weeds and 

 grasses with little or no crop injury: Monuronat 1 to 1-1/2 pounds or a light aromatic 

 oil at 80 gallons per acre applied just prior to emergence of asparagus. Higher rates 

 of application may result in injury. 



(2) Established beds, pre -emergence . --For control of many annual weeds with little 

 or no crop injury: Either 2,4-D at 1-1/2 to 2 pounds, 2,4-DES at 3 to 6 pounds, TCA at 

 6 to 8 pounds, NPA at 4 to 8 pounds, DNBP at 4 to 8 pounds, or monuron at 1 to 2 

 pounds in 10 to 40 gallons of water per acre applied after disking and prior to spear 

 emergence. Beds are commonly disked to loosen the soil, destroy weeds, and to remove 

 old ferns. 



Comments and precautions . --Use highest rate on muck soils and heavy clay soils 

 under arid conditions; use lowest rate on light sandy soils under humid conditions. 

 TCA, 2,4-D, and monuron should not be applied more than once each season. Herbi- 

 cide mixtures are often required for satisfactory weed control if the weed population 

 contains grasses and broadleaved weeds. 



Beans 



(1) Pre -emergence. --For control of most broadleaved weeds and annual grasses 

 with little or no crop injury: DNBP at 4 to 8 pounds, PCP at 12 to 24 pounds, or CIPC 

 at 4 to 8 pounds in 10 to 40 gallons of water per acre. A mixture of DNBP at 4 pounds 

 and CIPC at 4 pounds in 20 gallons of water per acre will give control of smartweed 

 and annual grasses not controlled by DNBP alone; will also control lambsquarters and 

 ragw^eed which are not normally controlled by CIPC alone. 



Beets 



(1) Same as suggested for sugar beets. 



Cabbage, Cauliflower, Collards, Kale, Rape, Broccoli, Turnips, Mustard (as leafy 

 vegetables) 



(1) Pre -emergence . --For control of annual grasses and many broadleaved weeds on 

 direct seeded crops as an emergency measure: TCAat 6 to 8 pounds in 10 to 20 gallons 

 of water per acre. In several of the mid- Atlantic States experimental results have 

 shown that CIPC is effective as a pre-emergence spray at 1 to 3 pounds in 10 to 40 

 gallons of water per acre to control annual weeds in many of these crops. Injury to 

 some of these crops has been reported following the use of CIPC. 



Cantaloupes, Muskmelons 



(1) Pre -emergence. --For control of most annual weeds: NPA at 2 to 3 pounds in 10 

 to 40 gallons of water per acre on light sandy soils, 3 to 4 pounds on loam soils, and 

 4 to 6 pounds on clay and muck soils. Will control weeds for 4 to 6 weeks with little or 

 no crop injury. 



(2) Post-emergence. --A post-emergence application of NPA at 2 to 4 pounds in 20 

 to 40 gallons of water per acre may be applied 4 to 6 weeks after enaergence to extend 

 the effective period of weed control. Post-emergence treatments have not been as 



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