-4- 



We have little to suggest for control of grass weeds in corn or soybeans. It is too 

 late for AAtrex and oil in most fields. But if your weeds are still small enough for 

 this treatment, be certain to plant only corn or sorghum next year. 



Dowpon, Lorox, and Evik were discussed in last week's bulletin (No. 14) as directed 

 sprays for corn. The weeds in many fields are now too large for these treatments, 

 and most Illinois growers are not equipped for the accurate directed application 

 which is essential for these materials. But be certain that applications are made 

 carefully to minimize injury, since corn has very limited tolerance for these ma- 

 terials. Where corn and weed heights are still appropriate and you can get the 

 right equipment, you might still consider these. 



Broadleafed weeds in corn can still be controlled with 2,4-D or Banvel. Be fully 

 aware of the risk of corn injury and the possibility of injury to nearby, suscep- 

 tible plants. Use appropriate precautions. 



There is little you can do now to control grass weeds in soybeans except to use 

 good cultivation in those late-planted fields where weeds are still small enough. 



For broadleaf weed control in soybeans, it is too late for Tenoran or Norex in most 

 fields. Dinoseb (dinitro) may be used as a directed postemergence spray when 

 soybeans are about five inches tall and until they begin to bloom. This requires 

 special equipment in order to minimize injury to soybeans. Dinoseb is one of the 

 more toxic herbicides, and should be used with extreme care. 



2,4-DB is still a possibility for controlling cocklebur, annual morningglory, and 

 giant ragweed in soybeans. There is some risk of injury to soybeans, so spray only 

 where these weeds actually exist. Be certain that application rates are accurate 

 and uniform. 



A little Basagran is available for experimental use on a limited basis. It may 

 help in some fields where the weeds are still relatively small. 



Dyanap, Ancrack, and Klean Krop are combinations of naptalam (Alanap) and dinoseb 

 (dinitro) . These combinations are not cleared for postemergence use on soybeans 

 in Illinois. 



Sutan injury to corn this year appears to be greater than in any previous year. 

 The symptoms are leaves that are rolled and plants that are distorted and twisted. 

 Often, only scattered plants are affected. You may even find a good plant and an 

 affected plant in the same hill. 



Sometimes, less than 5 percent of the com in a field is affected, and the injury 

 is not considered serious. If the injury is not severe, the leaves may unroll or 

 the plant may break through the rolled leaves; but if the plants are badly twisted, 

 they may remain stunted. Surprisingly, some stunted plants may produce ears. 



If only Sutan was used without atrazine and injury is severe enough to justify re- 

 planting, the manufacturer indicates that soybeans can be planted- -but no sooner 

 than 21 days after the Sutan was applied. The injury in most fields is probably 

 not severe enough to justify replanting now, but each field should be carefully 

 inspected and considered individually. 



Some of the injury may be associated with factors such as the hybrid involved, ex- 

 cessive rates, overlapping, a poor job of incorporation, the physical condition of 



