may be serious, so recalibrate your sprayer after every few hundred acres. Be 

 sure you know the amount of any chemical you are applying, and be certain that the 

 amount you apply agrees with the recommended rate. 



If you set the speed for applying chemicals by positioning the tractor speed- 

 control lever, also check this --particularly after the recent rains. Harder soil 

 surfaces will result in a higher ground speed, even though the speed-control lever 

 setting is the same. To determine speed, check the time in seconds it takes to 

 drive between markers 88 feet apart with a running start. Your speed in miles per 

 hour is the number of seconds divided into 60. 



A water hose in the spray tank may result in back siphon into the well. To avoid 

 this, fix a bracket on your spray tank to hold the hose above water level when 

 filling. This will eliminate the possibility of a hose stuck down in the tank 

 siphoning pesticide into a well. 



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 Stephen 

 Sturgeon, University of Illinois College of Agriculture and Illinois Natural 

 History Survey. 



Plant Diseases: M.P. Britton, Department of Plant Pathology. 



Weeds: Crops, Ellery Knake, Department of Agronomy; Aquatic, Robert Hiltibran, 

 Illinois Natural History Survey. 



Spray Equipment: J.C. Siemens, Department of Agricultural Engineering. 



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

 county Extension advisers, and others, in cooperation with the USDA Agricul- 

 tural Research Service, Plant Pest Control Branch. 



