Research and field experience suggest that on the relatively dark soils of the 

 state, 2-1/2 pounds of Atrazine 80W plus a gallon of "crop" oil (non-phy to toxic) 

 applied postemergence may be just as effective, sometimes more effective, than a 

 preemergence application of 3-3/4 pounds of Atrazine 80W. 



On the relatively light-colored Illinois soils, a regular preemergence application 

 of Atrazine will likely remain one of the most successful treatments. 



Many factors influence the results with Atrazine and oil. To control annual grasses, 

 it is especially important to make the application 3 weeks after planting, when 

 grasses are small (up to 1-1/2 inches). If applied too late, weed control is less 

 effective and the possibility of injury to other crops next year is greater. Do 

 not mix 2,4-D with the Atrazine and oil, since there is greater chance of corn injury, 



Although corn has displayed excellent tolerance to Atrazine alone, corn has some- 

 times shown a general stunting where oil was added. In 1967, there were a few cases 

 of fairly severe injury to corn where Atrazine and oil were used. 



Where a reduced Atrazine rate has been used in combination with another herbicide 

 for preplant or preemergence application, an early postemergence Atrazine and oil 

 application at a reduced rate might offer "another chance," in case control with 

 the earlier treatment has not been satisfactory. But where Atrazine is applied 

 twice, do not exceed the amount normally recommended for preemergence application 

 for the soil type involved. 



Broadleaf weeds in lawns can be kept to a minimum this summer by the proper use of 

 a starter fertilizer and by following other recommended establishment practices. 

 The use of 2,4-D and 2,4-5-TP and most of the selective broadleaf weed killers are 

 not recommended for newly seeded lawns. Often the first mowing will reduce the 

 broadleaf weed problem enough for the lawn to look presentable. However, if the 

 weeds persist after the first few mowings, 2,4-D or 2,4,5-TP may be applied for. 

 effective control. 



Remember that broadleaf herbicides may damage or even kill desired plants (bent- 

 grass, white clover, etc.). Pay particular attention to the container label for 

 information as to what weeds will be controlled and the lawn grasses that may be 

 treated safely. Follow the directions and precautions on the label. 



Filamentous algae growth often becomes apparent in many bodies of water with the 

 onset of warm weather. These unsightly mats frequently drift with the wind and 

 water currents. 



Applying fine crystals of copper sulfate directly to the algae mats will eliminate 

 them. The copper sulfate causes the algae mats to turn white and disappear. A 

 follow-up application may be necessary to completely remove all of these mats. 



The best time to apply copper sulfate is as soon as the mats appear. The mats are 

 small then, less time will be required to treat them, and less copper sulfate will 

 be needed. 



Another method would be to apply copper sulfate around the margins of the body of 

 water, treating only the water area infested, at a rate of copper of 1 part per 

 million. This method of application is also very effective. 



