-4- 



Resume spraying after the grain is well on its way and is in the dough stage- -about 

 3-1/2 weeks after the silks begin to emerge. Remember, however, that the weeds will 

 usually be large, tough, and harder to kill with 2,4-D at that time. 



When the corn reaches the dough stage, many weeds have already done most of their 

 damage by competing for nutrients and moisture. They will also have developed suffi- 

 ciently to be capable of producing new plants. However, the late spraying may make 

 harvesting a little easier. 



FENCE-ROW WEEDS 



When the corn and beans are laid-by, many farmers have time to tackle weeds in the 

 fence rows. Use dalapon (Dowpon) to control grassy weeds. You can add 2,4-D to con- 

 trol broadleaf weeds. If desirable grasses are present, omit the dalapon and use only 

 the 2,4-D. 



WEEDS IN SMALL GRAIN STUBBLE 



When you harvest small grain, you give weeds such as foxtail and ragweed a chance to 

 grow more vigorously. If you do not plan to work your fields for a while, you may 

 want to consider clipping or spraying in order to limit the production of weed seeds. 



If you do not have a grass or legume seeding, consider spraying. A low-cost applica- 

 tion of 2,4-D can check most broadleaf weeds. A few pounds of dalapon (Dowpon) per 

 acre- -alone or added to 2,4-D- -can reduce the production of grassy weed seeds con- , 

 siderably. The smaller the grass, the less dalapon you will need. If the weeds are ! 

 well developed, it may pay to clip or chop the stubble before spraying. 



Spray materials will cost from 50 cents to 4 dollars an acre, depending on the mate-, 

 rials and rates used. Spraying now to reduce the supply of weed seeds in the soil 

 will mean easier and cheaper control when you plant corn or soybeans next year. 



JOHNSONGRASS CONTROL 



If you have johnsongrass in wheat stubble and plan to plant corn or soybeans in that 

 field next spring, consider applying dalapon (Dowpon) now for control. Clipping or 

 chopping the johnsongrass once or twice before spraying will help deplete food re- 

 serves in the roots and rhizomes and will usually improve control. 



Spray when the johnsongrass is about a foot high and is actively growing during warm, 

 moist weather. Use 8 pounds of dalapon in 30 to 40 gallons of water per acre. Wait 

 at least a week or two before working the soil to give the dalapon plenty of time to 

 translocate and act on roots and rhizomes. Unless johnsongrass is growing actively 

 when sprayed, results may be disappointing. 



By spraying johnsongrass this summer, you can control most old johnsongrass and avoid 

 delays in planting next spring. But plan to follow up next spring with a preemergence 

 application- -such as Treflan for soybeans- -to control any johnsongrass that may grow 

 from seed. See Illinois Circular 827 for more details. 



PLANT DISEASES 



WEATHER CONDITIONS FAVOR BLIGHT DEVELOPMENT 



Conditions are nearly ideal for the spread and development of the southern corn leaf 

 blight. The susceptible host--T cytoplasm corn, either alone or in blends- -is growing 



