combining atrazine or simazine with Lasso or Sutan to give broadleaf weed control. 

 Remember, it is necessary to incorporate Sutan soon after application. 



MACHINERY 

 SPRAYER CALIBRATION 



The importance of properly calibrating the application equipment used with agricul- 

 tural chemicals cannot be overemphasized. For sprayers, the factors to be considered 

 include nozzle type and size, operating pressure, ground speed, and the concentration 

 of the chemical in the tank. It is important to check all of the variables involved. 

 Copies of Circular 837, Calibrating and Maintaining Spray Equipment, are available and 

 may be helpful. 



Several nozzle types are being used for applying herbicides. The regular, flat-fan 

 nozzle is the most-popular one. It should be used at pressures between 15 and 30 p.s.i. 

 never over 40 p.s.i. Nozzle spacing should be around 20 inches, with a boom height that 

 provides about a 25-percent overlap. 



A nozzle manufactured for the specific purpose should be used for band spraying. 



Flooding, flat-spray nozzles are recommended for applying herbicides, especially where 

 drift is hazardous because the particles are larger. 



Flooding nozzles should be mounted on about 40 -inch centers at such a height that the 

 patterns of adjacent nozzles will overlap about 10 percent. If the boom can not be 

 maintained at such a low height, the boom height can be increased to obtain double 

 coverage. However, the spray will be more susceptible to drift and to distortion of 

 the pattern because of the wind. 



Other nozzle types are also available. With proper selection, adjustment, and the 

 like, these can be used to apply herbicides satisfactorily. 



All nozzles wear and require replacement. A brass nozzle tip should be replaced after 

 it has been used to spray 100 acres. 



READ THE LABEL AND FOLLOW ALL PRECAUTIONS 



This weekly report was prepared as follows : 



INSECTS: H.B. Petty, Steve Moore, Roscoe Randell , Don Kuhlman, and Tim Cooley , College 

 of Agriculture, University of Illinois at U rb ana- Champaign , and the Illinois Natural 

 History Survey and George McKibben, Dixon Springs Experiment Station. 



WEEDS: M.C. McGlamery , Department of Agronomy. 



MACHINERY: J.C. Siemens, Department of Agricultural Engineering. 



AG COMMUNICATIONS: Del Dahl . 



The information for this report was gathered by these people, staff members, county 

 Extension advisers, and others, in cooperation with the USDA Agricultural Research 

 Service, Plant Pest Control Branch. 



