-5- 



clover, alsike clover, or birdsfoot trefoil. Apply when the weeds are less than 

 three inches high. No portion of a treated crop should be fed to livestock within 

 thirty days of application. 



2,4-DB may also be used to control broadleaf weeds in established legumes. Follow 

 the rates recommended on the product label. Do not graze or harvest treated crops 

 for thirty days after treatment. Fall treatment will control most winter-annual 

 broadleaf weeds. 



Princep (simazine) can be used on pure stands of alfalfa that have been established 

 for twelve months or more. Do not use Princep for mixed grass-alfalfa stands. Apply 

 after the last cutting, but before the ground is permanently frozen for the winter. 

 Princep will control many weeds that germinate in the fall. A rate of 1 to 1-1/2 

 pounds per acre for Princep 80W is suggested, depending on the soil texture. Do 

 not use Princep on sandy or high-pH soils. Do not graze animals on a treated area 

 for thirty days or cut hay for sixty days after treatment. 



Alfalfa may sometimes show some injury from simazine, especially if the alfalfa un- 

 dergoes stress from such factors as winter injury or disease, like bacterial wilt. 



Some of the weeds that may be controlled by Princep include chickweed, henbit, shep- 

 herdspurse, pennycress, peppergrass, yellow rocket, wild mustard, white cockle, downy 

 bromegrass, pigweed, and lambsquarter. 



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, Department of Agronomy. 



PLANT DISEASES: M.C. Shurtleff and Ed Burns, Department of Plant Pathology. 



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. 



