-4- 



WEEDS 



POSTEMERGENCE SPRAYS FOR SOYBEANS 



Consider 2,4-DB for emergency situations where cocklebur is a serious problem- - 

 as it is in some bottomland areas. This chemical is sold under several trade 

 names, including Butoxone SB and Batyrac 175. The herbicide may be broadcast 

 from ten days before soybeans begin to bloom until midbloom, or may be used as 

 a post emergence, directed spray when soybeans are 8 to 12 inches tall and cock- 

 leburs are 5 inches tall . 



Applying 2,4-DB may also provide fairly good control of annual morningglory and 

 giant ragweed. But don't expect 2,4-DB to control most of the other common weeds 

 found in Illinois soybean fields. 



Follow the application rates specified on the label carefully. This will keep 

 soybean injury to a minimum. 



After 2,4-DB is applied, soybeans may show early wilting and a curving of the 

 stems later on. Some stem cracking and proliferated growth may occur at the 

 base of the plants, and lodging may increase. If excessive rates are applied 

 or unfavorable conditions exist near the time of treatment, soybean yields may 

 be reduced. 



FENCEROW CONTROL 



If vegetation in fencerows consists primarily of broadleaf weeds and desirable 

 grasses, use 2,4-D at the rate of 1/2 to 1 pound in at least 10 gallons of water 

 per acre. (Two miles of fencerow that is 4 feet wide equals about an acre.) Take 

 care to avoid injury to nearby, desirable plants. If grass weeds such as Johnson- 

 grass or foxtail are growing in the fencerow, mix dalapon (Dowpon) with 2,4-D to 

 control both broadleaf weeds and grasses. Be sure to spray before the seed heads 

 form on the grasses. 



The common rate for controlling broadleaf and grass weeds in fencerows is 50 gal- 

 lons of water, 1 quart (1 pound) of 2,4-D, and 5 pounds of Dowpon for each acre of 

 fencerow. 



WEEDS IN SMALL-GRAIN STUBBLE 



Weeds like ragweed that grow in small -grain stubble add to the pollen count in 

 the atmosphere and the discomfort of those who suffer from hay fever. A small 

 amount of 2,4-D or dalapon (Dowpon) applied to grain stubble can prevent the 

 production of weed seeds and reduce the pollen count quickly, effectively, and 

 inexpensively. These herbicides are much more effective than mowing as a means 

 of preventing seed production. 



HAIL INJURY 



If hail has injured a crop and you're trying to decide whether to replant, don't 

 do anything for a while. Sit tight for about three days after the damage occurs, 

 then inspect the plants for new growth. If the growing point of corn shows little 

 or no injury and new growth is developing well, it will probably be best to leave 

 the crop rather than replant now. 



Check soybeans for defoliation and stem breakage. If you have at least one node 

 on a good stem and new buds are developing well, it's probably best to leave it 



