The corn herbicides suited for sorghum are Ramrod, Ramrod/atrazine, AAtrex, and 

 2,4-D. Milogard, Herban, Herban 21A, and Herban 21P are specific sor- 

 ghum herbicides. 



Ramrod (propachlor) is cleared for preemergence use on grain sorghum (milo) but 

 not on forage sorghum. The rate is the same as for corn. Ramrod can also be 

 mixed with AAtrex or Milogard or followed with a postemergence spray of 2,4-D 

 or AAtrex to control broadleaf weeds. 



AAtrex (atrazine) is cleared for use in Illinois only as a postemergence appli- 

 cation. AAtrex is cleared for preemergence application, using combinations of 

 Ramrod and Herban. 



Milogard (propazine) is a preplant or preemergence herbicide used on grain or 

 wheat sorghum. It is chemically related to atrazine, but is less effective on 

 some grassy weeds. The rate of Milogard 80W is 2-1/2 to 4 pounds per acre 

 (broadcast basis), depending on the soil. Milogard cannot be used on sandy 

 soil. Corn and sorghum are the only crops that can be grown on fields treated 

 with Milogard for eighteen months after application. 



Herban (norea) is a substitute urea herbicide, sold as a 80-percent wettable 

 powder. It is usually combined with atrazine or propazine. Herban 21A and 

 Herban 21P are mixes of 2:1 Herban (norea) with atrazine and propazine, respec- 

 tively. 



2,4-D can be used to control many broadleaf weeds as a postemergence treatment. 

 Sorghum is most tolerant to 2,4-D when it is 4 to 12 inches tall. Use extension 

 nozzles (drops) if the sorghum is over 8 inches tall. 



2,4-D and AAtrex (atrazine) are the only herbicides presently cleared for use on 

 forage sorghums and sorghum- sudan hybrids. Narrowing the row widths and using 

 high plant populations are also good practices for weed control in forage sorghums. 



CORN INJURY PROBLEMS 



We have received several reports of corn injury, particularly "leafing-out" under 

 the ground. This problem can be caused by several things, including some chemi- 

 cals. However, other causes would include crusting of the ground, planting too 

 deep, or damage to the seed germ. In several cases, small round seed was planted. 

 Such seed is much more susceptible to germ damage than flat seed because of the 

 germ's convex surface. Some inbred corns are more susceptible to "leafing-out" 

 under the surface than others because of a short first internode. So you would 

 expect some single-cross corns to be more susceptible than others. 



In some cases, the herbicide Lasso was used. Lasso injury can cause "leafing- 

 out" under the ground because of a constriction of the coleoptile. Lasso injury 

 usually causes onion- leaf ing on a few of the emerged plants. 



WEED PROBLEMS 



We have also received several calls about wirestem muhly control in corn- -especially 

 from the northwestern part of the state. There is no good herbicide- control program 



