tolerant. Oats should not be sprayed unless heavily infested with weeds. 

 Yields may be reduced by applications of 2,4-D nnade at any time from 

 emergence to heading. Oats, however, are more tolerant to MCPA than 

 to 2,4-D, 



FLAX 



Post -emergence . - -For control of broadleaved weeds - -mustard, lambs - 

 quarters, pigweed, pennycress, cocklebur, marsh-elder, and ragweed: Amine 

 or sodium salts of MCPA or amine salt of 2,4-D at 1/8 to 1/4 pound in 5 to 

 20 gallons of water applied w^hen weeds are small and flax is 2 to 6 inches 

 tall. For the southwestern flax-growing area: 2,4-D or MCPA at 1/2 to 3/4 

 pound per acre. 



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

 foxtail, and barnyardgrass: TCA at 5 pounds per acre. A 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 w^ill control broadleaved 

 w^eeds 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 knapw^eed. 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 broadleaved 

 weeds for 4 to 6 weeks: Diuron or monuron at 1/ 2 to 2 pounds, CIPC at 4 to 

 12 pounds, in 20 to 40 gallons of water applied immediately after planting. To 

 reduce cost, apply diuron or CIPC inamediately behind the planter press wheel 

 to a 12-inch band centered over the row^ (1 to 3-1/2 pound CIPC or 1/6 to 2/3 

 pound of diuron or monuron per acre of cotton). Lower rate suggested for low- 

 organic sandy loams; higher rate suggested for high-organic clay loams. 



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 treatments, or stunting 

 and chlorosis resulting from diuron or monuron treatments appear to in- 

 crease the susceptibility of cotton seedlings to disease organisms. Sustained 

 high temperatures of 90°F. or more reduce the period cf 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. 



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