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: Monuron at 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 monuron at 1 to 2 pounds, 2,4-D 

 at 1-1/2 to 2 pounds, sesone at 3 to 6 pounds, TCA 5 at 6 to 8 pounds, NPA 

 at 4 to 8 pounds, orDNBP 6 at 4 to 8 pounds in 10 to. 40 gallons of water per 

 acre applied after disking and before 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. Herbicide mixtures are often re- 

 quired for satisfactory weed control if the weed population contains both 

 grasses and broadleaved weeds. 



Beans 



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 15 

 to 24 pounds, or CDEC or CIPC at 4 to 8 pounds in 20 to 40 gallons of 

 water per acre. A mixture of DNBP at 4 pounds and CIPC or CDEC at 

 4 pounds in 20 gallons of water per acre will control smartweed and annual 

 grasses not controlled by DNBP alone; also will control lambsquarters 

 and ragweed which are not normally controlled by CIPC alone. 



Beets 



Same control measures suggested for sugar beets (except DCU). 



Cole Crops : Cabbage, Cauliflower, Broccoli, Brussels Sprouts 



Pre -emergence .- -For control of annual grasses and many broadleaved 

 weeds in direct-seeded crops as an emergency measure: TCA 7 at 6 to 8 

 pounds in 10 to 20 gallons of water per acre. In many 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. Pre-emergence applications 



5 TCA cannot be recommended (as of April 1, 1958) for use on asparagus since evidence has not been devel- 

 oped to prove it will leave no residue or/and tolerances have not been set under Public Law 518. 



6 DNBP cannot be recommended (as of April 1,1958) for use on asparagus since evidence has not been devel- 

 oped to prove it will leave no residue or/and tolerances have not been set under Public Law 518. 



7 TCA cannot be recommended (as of April 1, 1958) for use on broccoli and Brussels sprouts since evidence 

 has not been developed to prove it will leave no residue or/and tolerances have not been setunder Public Law 518. 



8 CIPC cannot be recommended (as of April 1, 1958) for use on cabbage, cauliflower, broccoli, and Brussels 

 sprouts since\evidence has not been developed to prove it will leave no residue or/and tolerances have not been 

 set under Public Law 518. 



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