solution at rate of 5 gallons per acre (equal to 1/2 pound of 2,4-D) on top of weeds in 

 the row; direct a second nozzle delivering at rate of 15 gallons per- acre (equal to 1-1/2 

 pounds of 2,4-D) on soil between rows. 



Comments and precautions . --Treatment is especially valuable in fields where 

 weeds become serious between layby and harvest. Nozzles should be adjusted to apply 

 herbicide on top of weeds. There is less chance of injuring corn from this treatment 

 than from either pre-emergence or earlier post-emergence treatments, 



SORGHUM 



The use of 2,4-D for weed control in sorghum is suggested only as an emergency 

 treatment when weeds cannot be controlled by cultivation. When 2,4-D is used as post- 

 emergence spray, it should be applied at lowest rate necessary for weed control and not 

 to exceed rates suggested for weed control in corn. Sorghums are most tolerant to 

 2,4-D in the 4- to 8-inch stage of growth. Precautions regarding weed control in corn 

 apply also to sorghum. 



WHEAT, BARLEY, AND OATS--FALL OR SPRING SEEDED 



A. Small Grains Underseeded With Legumes 



(1) Post-emergence . --For emergency control of serious infestations of mustard, 

 yellow rocket, and other broadleaved weeds if cereal crops are underseeded with a 

 mixture of legumes such as alfalfa, birdsfoot trefoil, lespedeza, red clover, sweet- 

 clover, white clover, or other legumes: Amine salt of MCPA or 2,4-D at 1/8 to 1/4 

 pound in 5 to 20 gallons of water per acre, or annine salt of DNBP at 3/4 to 1 pound in 

 30 to 50 gallons of water per acre. MCPA and DNBP are less likely to injure legumes 

 than 2,4-D. The MCPA application should be made after cereals are well tillered, 

 usually 4 to 8 inches tall, but prior to jointing or reaching boot stage. If DNBP is used, 

 it should be applied only when the weeds are in the seedling stage. The legumes are 

 less likely to be injured if a small grain canopy is allowed to develop prior to applica- 

 tion of MCPA. NOTE: Avoid use of post-emergence applications of 2,4-D and MCPA 

 unless the weed infestation is serious enough to result in reduction or loss of legume 

 stands and reduced small grain yields. 



B. Small Grains Not Underseeded with Legumes 



(1) Post-emergence. --For control of mustard, wild radish, yellow rocket, ragweed, 

 wild vetch, lambsquarters, pigweed, cocklebur, smartweed, sunflowers, shepherd's 

 purse, prickly lettuce, plaintain, docks, field bindweed, and others: Ester or amine 

 salt of 2,4-D or MCPA at 1/4 to 1/2 pound in 5 to 20 gallons of water per acre applied 

 after cereals are well tillered, usually 4 to 8 inches tall, but prior to jointing or 

 reaching boot stage. Growth of w^ild onion, wild garlic, Canada thistle, sow thistle, 

 curled dock, buttercup, field bindweed, and white top in arid areas, and several other 

 weeds nnay be effectively inhibited but not necessarily killed. Grasses and several 

 perennial weeds, such as horsenettle, white cockle, milkweed, and others, will not be 

 controlled by the treatment. 



Comments and precautions. --In the western Great Plains and Inter mountain region, 

 2,4-D should be applied at 1/2 to 1 pound per acre to control most weeds infesting 

 small grains. One to 2 pounds of 2,4-D may be required to control semitolerant 

 weeds, but these rates may be used without serious injury to the small grains. In 

 other agricultural areas, rates of more than 1 pound per acre should be used only 

 when necessary to kill weeds causing serious damage to small grains. 



Both 2,4-D and MCPA can be used to control weeds in wheat, barley, and oats 

 w^ithout injuring crops if treatments are restricted to the most tolerant stages of 

 growth of the cereals. 



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