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Control Emerged Waterhemp Prior to Planting

  • May 16, 2013

Earlier this month, we discussed advantages of and techniques for controlling emerged weed vegetation prior to planting.  Several winter annual weed species have reached maturity while others, such as cressleaf groundsel (Figure 1),
began to flower within the past 10 days across areas of central Illinois.  Control of these mature plants with herbicides or single passes of tillage equipment will continue to be challenging.
Preplant control is also needed for emerged summer annual grass and broadleaf weed species. …

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Soil-Residual Herbicides Applied to Emerged Corn

  • May 14, 2013

A potential scenario of planting delays will be corn planted in fields where no soil-residual herbicide was applied.  If the corn has not yet emerged, the soil-residual herbicide can be applied as originally planned.  But, what if the corn has emerged and the soil-residual herbicide has not been applied?  Can the application proceed as planned, or will a different product need to be selected?  The answer depends on the respective herbicide.
Most, but not all, soil residual herbicides can be applied after corn has emerged. …

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Stripe rust of wheat observed in Illinois

  • May 10, 2013

Stripe rust of wheat was observed in Champaign County, IL on May 10, 2013 (Fig. 1). The incidence of the disease was very low. The observation of this disease in Champaign County indicates that stripe rust likely is present in southern Illinois counties too.


Wheat producers will need to continue to scout their crop for stripe rust, and apply an effective fungicide if necessary (see this previous post for additional information about stripe rust and fungicides:…

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Conditions favorable for Fusarium head blight (scab) in southern Illinois

  • May 9, 2013

Wheat plants are now beginning to head out and flower in parts of southern Illinois. During this critical time of wheat development, wheat becomes susceptible to infection by Fusarium graminearum, the causal agent of Fusarium head blight (FHB; also known as scab) (Fig. 1).  This disease can cause reduced grain yield, test weight, and quality.  In addition, the fungus can produce toxins that will contaminate grain such as deoxynivalenol (DON; also known as vomitoxin). …

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University of Illinois Weed Science Field Research Tour

  • May 7, 2013

We invite you to attend the 2013 University of Illinois Weed Science Field Day on Wednesday, June 26th at the University of Illinois Crop Sciences Research and Education Center, located immediately south of the main campus.  Coffee and refreshments will be available under the shade trees near the Seed House beginning at 8:00 a.m.
Similar to past years, we will car pool to the fields where participants can join in a guided (but informal) tour format. …

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Determining How Much Nitrogen Is Present

  • May 6, 2013

Fall Nitrogen
With a still fresh memory of the drought conditions during last year, recent rains have reduced concerns over water availability for the start of the 2013 growing season, but at the same time, concerns over nitrogen (N) loss have increased. Nitrogen loss is difficult to predict because it depends in many factors such as time of N application, type of N source, soil type and temperature, and the amount of precipitation received. While it is difficult to know how much N is lost without a direct analysis of soil N,…

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Wheat – foliar disease update and outlook

  • May 3, 2013

Symptoms of some foliar diseases of wheat are apparent in Illinois wheat fields, and the threat of other diseases is on the horizon. Current wheat diseases that have been observed in the state are Septoria and Stagonospora leaf blotch, Barley yellow dwarf, and other virus diseases.
Of these diseases, only the fungal leaf blotches (Septoria/Stagonospora) can be managed with foliar fungicides.  Although a flag leaf emergence timing for a foliar fungicide application may be recommended sometimes,…

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Control Weeds before Planting

  • May 1, 2013

Wet soil conditions have caused delays in both planting and efforts to control existing weed vegetation.  Much of the existing weed growth is comprised of winter annual species, such as common chickweed, henbit, purple deadnettle, etc., but emergence of several summer annual species also has begun.  The growth of all species has accelerated with warmer temperatures and abundant soil moisture.  Several species of winter annuals are flowering and could produce viable seed before they are controlled with either tillage or herbicides. …

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Corn Herbicide/Insecticide Precautions

  • April 25, 2013

A recent article published in this Bulletin by Dr. Mike Gray (“Soil Insecticide Use on Bt Corn Expected to Increase this Spring Across Much of Illinois”) provides insights and data that suggest the use of at-planting soil-insecticides in corn is likely to increase this season.  Many insecticide choices are available to farmers, but several of these could restrict the option to use certain corn herbicides.  Specifically, using an organophosphate (OP) insecticide at planting or after corn emergence could restrict the use of herbicides that inhibit either the ALS or HPPD enzymes. …

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Herbicide Resistance: Are Soil-Applied Herbicides Immune?

  • April 16, 2013

The continual evolution of weed species and populations resistant to herbicides from one or more mechanism-of-action families represents one of the most daunting challenges faced by weed management practitioners.  Currently in Illinois, biotypes of 12 weed species have been confirmed resistant to one or more herbicide mechanisms of action.  Resistance to herbicides that inhibit the ALS enzyme is the most common type of resistance in Illinois.  Waterhemp has evolved resistance to more herbicide mechanisms of action than any other Illinois weed species,…

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