-4- 



> 

 The burden of responsibility for the continued use of the tank mixes in category 

 three is that of the user, not the U.S. EPA. He applies them at his own risk with 

 respect to any effects on crops and application equipment, applicator safety, envi- 

 ronmental effects, and tolerance intervals before harvest. 



The U.S. EPA is unofficially sanctioning the use of tank mixes, but is also absolv- 

 ing itself of responsibility. The EPA also states that in the future, it may take 

 appropriate action to rule the use of specific tank mixes or serial applications as 

 inconsistent with label instructions on a case-by-case basis. 



WEEDS 



WEED CONTROL IN CORN 



GRASS CONTROL. AAtrex and oil s hould not be used after June 10 if any crop other 

 than corn or sorghum will be planted in the field next year. Also, application should 

 be made before grasses are more than 1-1/2 to 2 inches tall. If conditions are ideal, 

 taller grasses may be controlled, but don't expect it. And don't expect significant 

 increases in larger grass control by using higher rates either. Bladex used postemer- 

 gence should be applied before the corn is in the four- leaf stage and before the grasses 

 are 1-1/2 inches tall. Outfox should be applied before corn in 10 inches high and 

 grasses are less than 2 inches tall. \ 



BROADLEAF CONTROL. 2,4-D is an economical and effective treatment for controlling many 

 broadleaf weeds in corn. For maximum effectiveness, apply 2,4-D when weeds are small. 

 That is when they are the easiest to kill. You can broadcast over the top of the corn i 

 and weeds until the corn is about 8 inches high, but use "drop nozzles" or extensions I 

 from the boom after corn is 8 inches tall to help keep the 2,4-D out of the corn whorls 

 and to decrease the possibility of corn injury. 



Some corn is damaged by 2,4-D each year. Spraying 2,4-D during very cool, wet weather 

 when corn plants are under stress or during very hot, humid weather may increase the 

 possibility of corn injury. Some hybrids are more susceptible to 2,4-D injury than 

 others. To help avoid damage to corn, apply 2,4-D at no more than the recommended rate. 



The suggested rates per acre for broadcasting are a sixth to a fourth pound of the 

 ester formulations and half a pound of the amines. The amines are less likely to have 

 vapor drift. Many insurance policies do not cover the use of the ester formulations. 



Banvel (dicamba) is more effective than 2,4-D for controlling smartweed. Use 2 to 4 

 ounces of dicamba (4 to 8 ounces of Banvel) per acre. 



Soybeans are much more susceptible to drift injury from Banvel than from 2,4-D. The 

 likelihood of soybean injury causing yield reductions goes up with the rate and the 

 closeness of the soybeans to the blooming stage. Earlier applications at lower rates 

 are more likely to control smartweed and less likely to cause reductions in soybean 

 yields. 



Air- induction nozzles are less likely to cause drift because they operate at lower noz- 

 zle pressures; thus, particle size is larger. Adding foam additives or drift inhibi- 

 tors may help reduce drift and also visualize drift patterns. 



WEED CONTROL IN SOYBEANS ( 



We have received several calls about soybeans that were planted before the rains with- 

 out a herbicide that have now emerged. The question is what can be done to control the 

 weeds and not to injure the soybeans. 



