-6- 



application. Soybeans generally outgrow the injury without serious effects on yield. 

 To minimize Banvel drift, use low pressure and avoid spraying when the wind velocity 

 is more than 5 miles per hour. Using drop nozzles will lessen the chance of corn in- 

 jury and help minimize drift. Air-induction nozzles : and foam additives may also re- 

 duce driftv^Applying Banvel early when soybeans in the vicinity are small presents 

 less risk than when soybeans are closer to blooming. 



POISON IVY CONTROL 



Apparently there is no absolute immunity to poison- ivy infection , although some people 

 are more susceptible than others. Persons who consider themselves immune may become 

 more susceptible after sufficient exposure. Clothing, garden tools, and pets can become 

 contaminated and can serve as sources of the irritant. Smoke from burning poison ivy 

 may also carry the toxin. 



The first step in poison ivy control is proper identification. This may prove diffi- 

 cult because the plant can assume many different appearances. Poison ivy may vine on 

 fences, walls, or trees. It may spread along the ground, or it may even appear as an 

 erect shrub. Each leaf is made up of three leaflets. They may be glossy or dull-green, 

 and may have smooth, toothed, or lobed edges. Variations can occur on the same plant. 



Amitrole or amitrole-T often provide the most effective control, although several 

 other chemicals can also control poison ivy. Ammate (ammonium sulfamate) and "brush- 

 killer" (a mixture of 2,4-D and 2,4,5-T) will control poison ivy. Be sure and observe 

 the restrictions not to use 2,4,5-T around homes, on lakes, ponds, ditch banks, or on 

 food crops . 



Apply the materials any time after the plant leaves have reached full size. Soak the 

 plants thoroughly with the spray, but do not let amitrole contact desirable grass or 

 broadleaf plants or allow "brushkiller" ' to drift to desirable trees, shrubs, or flow- 

 ers. Avoid skin contact with Ammate. 



Further information can be obtained from Illinois Circular 850, "Controlling Poison 

 Ivy," available from the county Cooperative Extension Service office, or from the Of- 

 fice of Agricultural Publications, 123 Mumford Hall, Urbana 61801. 



WEED CONTROL IN FENCE ROWS 



Use only 2,4-D to control weeds in fence rows , if the vegetation consists primarily of 

 broadleaf weeds. If there are undesirable grasses (such as foxtail or Johnsongrass) , 

 you can mix Dowpon (dalapon) with the 2,4-D for control. Spray grasses before the seed- 

 heads form. Mix 1 quart of 2,4-D (4-pound-per-gallon formulation) and 5 pounds of Dow- 

 pon with 50 gallons of water for spraying 2 miles of fencerow 4 feet wide (2 acres) . 

 Increase the amount of Dowpon to control larger grass weeds or perennial grasses. If 

 only small annual grasses are present, or if desirable perennial grasses are present, 

 decrease the rate of Dowpon. 



READ THE LABEL AND FOLLOW ALL PRECAUTIONS 

 This weekly report was prepared as follows: 



Petty, Steve Moore, Roscoe Randell , Don Kuhlman , and Tim Cooley , College 

 , University of Illinois at Urban a- Champaign , and the Illinois Natural 



INSECTS: H.B. Petty, Steve Moore, Roscoe Randell, Don Kuhlman, and Tim Cooley, College 

 of Agriculture , 

 History Survey. 



