TIME OF INCORPORATION 



Sutan or Vernam should be incorporated immediately. With Treflan, this can be done 

 within eight hours. With Lasso or AAtrex, there is no rush. 



For Sutan or Vernam, it is best to have a spray boom in front of the incorporation 

 equipment. The rate and degree of loss of some herbicides will depend on soil and 

 atmospheric conditions. If the soil is fairly wet with moisture moving upward and 

 vaporizing at the surface, the herbicide loss may increase. The loss will also be more 

 rapid on a hot, sunny, windy day than on a cool, cloudy, calm day. 



INCORPORATION AND RATES 



The deeper you mix the herbicide, the more it is diluted. Delaying incorporation 

 also may cause some herbicide loss. So, consider using the upper rate range for 

 your soil, if you are incorporating a herbicide like Lasso or if incorporation is 

 delayed. 



Check the individual herbicide labels for specifics on incorporation equipment, 

 timing, and rates. 



MORE ON SUNFLOWERS 



There is a question about planting sunflowers where atrazine was used last year. 

 Sunflowers appear to be a little more sensitive to atrazine than soybeans, but 

 less sensitive than oats. If you used atrazine, preplant or preemergence last 

 year, we would not expect any serious problem of atrazine residue affecting this 

 year's sunflower crop, especially if a reduced rate of atrazine was used in a 

 combination. If atrazine was applied postemergence after June 10, 1971, do not 

 plant sunflowers there in 1972. Dry weather following late postemergence appli- 

 cations can decrease atrazine degradation and increase the chances of injury to 

 subsequent, sensitive crops. 



ENCLOSURE 



We thought you might be interested in the enclosed brochure describing a new College 

 of Agriculture publication, Poisonous Plants of the Midwest and Their Effects on 

 Livestock, as well as several other books. 



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 V 'rb ana-Champaign , and the Il- 

 linois 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. 



