yield nor the quality will be affected. The reason some wheat varieties tend to 

 blacken during certain seasons is unknown. 



WEEDS 



BROADLEAF WEED CONTROL IN CORN 



When is corn most susceptible to 2,4-D injury? The answer is that corn in almost 

 any stage of growth can be injured by 2,4-D. However, a few precautions will keep 

 damage to a minimum. Most 2,4-D labels carry the warning not to treat corn when 

 it is silking and tasseling. Using "drop" nozzles is recommended if the corn is 

 more than S to 12 inches tall. 



Spraying 2,4-D during cool, wet weather or hot, humid weather--when the corn is 

 under stress- -may increase the possibility of injury. Applying 2,4-D can cause 

 brittleness, bending and lodging- -especially in fast-growing corn. As an added 

 precaution, it is best to avoid cultivating corn for about a week after applying 

 2,4-D. 



The rate of 2,4-D to use varies with the concentration and formulation. The con- 

 centration of 4 pounds per gallon of 2,4-D is the most common one; however, other 

 concentrations are available. Amine formulations of 2,4-D require higher applica- 

 tion rates than ester formulations, but the amine formulations have less of a drift 

 hazard. 



Banvel can also be used to control broadleaf weeds in corn. This chemical provides 

 effective smartweed control, with fewer corn- injury problems than 2,4-D. However, 

 special care must be taken to prevent damage from drift to soybeans , which are 

 especially susceptible to such injury. 



AAtrex (atrazine) used as a postemergence spray also provides effective control 

 of broadleaf annual weeds in corn. However, grasses must be treated before they 

 are 1-1/2 to 2 inches tall. 



Remember that the timely use of a rotary hoe and cultivator is still an effective 

 means of weed control. Used correctly and at the right time, these tools can 

 greatly improve a poor or fair weed-control situation caused by herbicide failure. 



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 Urbana-Champaign , and the Illi- 

 nois Natural History Survey. 



WEEDS: Ellery Knake and Marshal McG lamer y , Department of Agronomy. 



PLANT DISEASES: M.C. Shurtleff and Ed Burns, Department of Plant Pathology. 



AG COMMUNICATIONS : Ray Wood is. 



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. 



