Atrazine and oil can be used to control grass and broadleaf weeds in some areas. See 

 the UI 1972 Weed Control Guide, and follow label precautions closely. A limited amount 

 of Outfox, a new material that can be used in a manner similar to that for atrazine 

 and oil, will be available this season. 



If grass becomes too large to cultivate or to apply atrazine and oil, dalapon or Lorox 

 are possibilities for directed postemergence treatment. For either of these materials, 

 special spray rigs will be needed in order to direct the spray. Considerable care must 

 be taken to avoid injury to corn. These directed treatments have not been popular in 

 Illinois, but are discussed in the 1972 Weed Control Guide. 



USE A ROTARY HOE BEFORE FOXTAIL DEVELOPS 



Giant foxtail forms a crown at about the soil surface. From this, the crown roots de- 

 velop and grow downward, if they are not impeded by dry soil or a herbicide. Between 

 the seed and the crown, there is a thin, thread-like part called the mesocotyl, or 

 first sub crown internode. If the crown roots are not yet established, a good rotary 

 hoeing can often break the mesocotyl and kill the foxtail. 



KEEP HERBICIDES OUT OF WELLS 



Do not let pesticides siphon out of spray tanks into wells. Be sure to have positive 

 shut-off valves; also, do not put the hose down into the tank to prevent "back -siphon in; 



One applicator puts a "hog-waterer" type float at the top of the tank, and attaches the 

 hose to it. When the tank is full, the float shuts off the water. Since the hose is 

 only at the top of the tank, back -siphoning cannot occur. Using a quick coupler is a 

 handy way to fasten and unfasten the hose. 



i 

 MACHINERY 



< 



TAKE CARE WHEN APPLYING 2 ,4-D POSTEMERGENCE 



A considerable amount of corn will probably be sprayed with 2,4-D for weed control dur- 

 ing the next few weeks. Spraying with 2,4-D is still an economical and effective meth- 

 od of controlling many broadleaf weeds in corn. However, injury to desirable plants 

 can occur. 



Mist or vapor from 2,4-D has damaged susceptible plants growing a half mile or more 

 from the area actually sprayed. Much of the 2,4-D damage can be avoided if users are 

 aware of the dangers and follow precautions when applying it. 



A wide variety of broadleaf crops and ornamental plants can be severely injured or 

 killed by 2,4-D. Susceptible plants include tomatoes, snap beans, soybeans, sun- 

 flowers, melons, grapes, cotton, roses, chrysanthemums, redbud trees, and birch 

 trees. Some of these plants are more susceptible to injury from 2,4-D than the com- 

 mon broadleaf weeds . 



To prevent injury to nearby plants, do not use the high-volatile esters of 2,4-D un- 

 less you thoroughly understand the dangers involved and there are no susceptible 

 plants nearby. Do not use any form of 2,4-D within a half a mile of susceptible 

 crops. Even with the low-volatile esters, the smaller droplets of spray can be 

 carried great distances by the wind. 



