-5- 



sure no material is left in these parts. Repeated rinsing with water plus a deter- 

 gent is usually enough to also remove most water-soluble herbicides. 



Excessive herbicide rates . To avoid crop injur)-, apply only the amount recommended 

 on the label of the product. An excess of some chemicals may remain in a field and 

 injure succeeding crops. Know how much water your sprayer applies per acre before 

 you add any chemical. Replace worn nozzles regularly. Calibrate your sprayer before 

 starting the spraying season and two to three times during the season. When using 

 wettable powders, be sure the sprayer has either an adequate by-pass for good agita- 

 tion or a mechanical agitator. 



Never add concentrated herbicide to an empty sprayer . First fill the tank a quarter 

 to a half full with water, then add the chemical with agitation. Do not let sprayers 

 containing wettable powders stand idle for more than an hour or two. Before start- 

 ing to spray again, check the bottom of tank to be sure none of the herbicide has 

 settled-out. 



Always shut off the sprayer before stopping in a field, and do not leave sprayer on 

 when turning at the ends of the rows. Use nondrip nozzles with a spring that allows 

 a more positive shut off at the nozzles when pressure is shut off. Do not discon- 

 nect hoses or spill concentrated herbicide in fields. Be sure the spray swaths do 

 not overlap. [Adapted from the North Dakota Pest Report.] 



READ THE LABEL AND FOLLOW ALL PRECAUTIONS 



This weekly report was prepared as follows : 



INSECTS: H.B. Petty, Steve Moore, Roscoe Ran dell , Don Kuhlman , and Tim Cooley , Col- 

 lege of Agriculture, University of Illinois at Urbana-Champaign and the Illinois Na- 

 tural History Survey. 



WEEDS: Ellery Knake and Marshal McGlamery , Department of Agronomy , and A.J. Turgeon, 

 Department of Horticulture. 



PLANT DISEASES: M.C. Shurtleff and Tim Bowyer, Department of Plant Pathology. 



AG COMMUNICATIONS : Ray Woodis . 



AG ENGINEERING: John C. Siemens. 



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

 Extension advisers, and others, in cooperation with the USDA Animal and Plant Health 

 Inspection Service. 



