For annual grasses--green foxtail, yellow foxtail (pigeon grasses), 

 giant foxtail, and barnyardgrass: TCA at 5 pounds per acre. Mixture of 

 1/4 pound MCPA and 5 pounds TCA in 10 to 20 gallons of water per acre 

 applied when weeds are small and flax is 2 to 6 inches tall will control 

 broadleaved weeds and the weed grasses listed above. 



To prevent seed production by Canada thistle, and to control Russian- 

 thistle: Esters of MCPA or 2,4-D at 1/4 to 1/2 pound in 5 to 20 gallons 

 of water per acre applied on a spot-treatment basis. 



Comments and precautions . --MCPA is less likely than 2,4-D to injure 

 flax. MCPA and 2,4-D will not control wild oats, quackgrass, milkweed, 

 white cockle, and Russian knapweed. Applications to flax should be 

 avoided from early bud through bloom stages. 



COTTON 



Humid Cotton Belt 



(1) Pre -emergence . --For control of annual grasses and many broad- 

 leaved weeds for 4 to 6 weeks: CIPC at 5 to 10 pounds, diuron or monuron 

 at 1-1/5 to 2 pounds in 20 to 40 gallons of water per acre applied during 

 the planting operation. To reduce cost, apply CIPC or diuron immediately 

 behind planter wheel or press wheel to a 12- to 14-inch band centered 

 over row (1-1/2 to 3 pounds CIPC or 1/4 to 2/3 pound of diuron or 

 monuron per acre of cotton ). Lower rate suggested for sandy loam or 

 lighter textured soils; higher rate suggested for loams and heavier tex- 

 tured soils. 



Comments and precautions .- -Some injury may be expected if heavy 

 rains follow CIPC, diuron, or monuron applications on light textured 

 sandy soils. Enlarged, injured hypocotyls, as a result of CIPC treat- 

 ments, or stunting and chlorosis resulting from diuron or monuron 

 treatments appear to increase the susceptibility of cotton seedlings 

 to disease organisms. Sustained high temperatures of 90° F. or more 

 reduce the period of effective weed control with CIPC. Band treatment 

 over the row with diuron or monuron is less likely to result in residual 

 chemical effects on succeeding crops than broadcast treatment. 



(2) Directed post-emergence . --For control of most small annual grasses 

 and broadleaved weeds: Special nonfortified herbicidal oils at the rate of 

 5 gallons per acre (based on 40-inch rows) directed to the 8- or 10-inch 

 drill area centered over the row. Oil should be directed laterally to drill 

 area at a height of less than 1 inch above the soil. Apply no more than 3 

 treatments at least 5 to 7 days apart, beginning when weeds first appear 

 in the drill row and the cotton is at least 3 inches tall. Applications should 

 not be made after bark cracks appear in the cotton stalk. These treat- 

 ments, properly applied, will kill crabgrass, foxtail, pigweed, lambs- 

 quarters, morning-glory, cocklebur, and others, but do not kill established 

 perennials such as Johnsongrass, nutgrass, and vines. 



Comments and precautions .- -Sprayer nozzles must be properly set to 

 avoid serious injury to the cotton foliage and to insure control of the 

 weeds. 



Western Irrigated Cotton Belt 



Directional post-emergence in established cotton .- -For control of annual 

 grasses and broadleaved weeds from layby until harvest: Monuron or diuron 



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