-5- 



weed control in soybeans. The rate of Preemerge is 4 to 6 quarts per acre when 

 used in preemergence applications, or 2 to 5 quarts per acre in early postemer- 

 gence treatments. Use the lower rate if temperature is above 75° F. In the com- 

 bination, use the normal rate of Amiben or Lasso. 



FALL PANICUM CONTROL 



Fall panicum is a grass weed that continues to germinate late in the season. Pres- 

 ent practices --including earlier planting and "lay-by" plus a greater dependence 

 on chemicals and a reduction in the amount of mechanical tillage- -help create fa- 

 vorable conditions for late-emerging weeds, especially in wide-row corn where the 

 shade is late in coming between the rows. 



Fall panicum is a problem throughout Illinois, but the worst problem is in southern 

 Illinois because of wider rows, a longer growing season and greater dependence on 

 atrazine (AAtrex) as a herbicide. Fall panicum is especially a problem in zero- 

 tillage corn. 



Simazine (Princep) gives better control than atrazine (AAtrex) of late-emerging 

 grasses, such as fall panicum and crabgrass. Alachlor (Lasso) and butylate (Sutan) 

 are two other herbicides that have enough persistence to maintain control of late- 

 emerging grasses. Many people combine atrazine or simazine with Lasso or Sutan for 

 controlling broadleaved weeds. But remember that it is necessary to incorporate 

 Sutan soon after application. 



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 , Col- 

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

 Natural History Survey. 



WEEDS: Ellery Knake and Marshal McG lamer y , Department of Agronomy. 



AG COMMUNICATIONS: Ray Woodis. 



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. 



