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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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Applying Dicamba Prior to Planting

  • April 9, 2013

Dicamba is a growth regulator herbicide that can be used to control existing weed vegetation prior to crop planting.   Several commercially-available products contain dicamba, but not all products are specifically labeled for application prior to crop (especially soybean) planting.  Clarity may be applied before planting no-tillage corn at rates ranging from 8 (on coarse soils or medium- and fine-textured soils with less than 2.5% organic matter) to 16 (medium- and fine-textured soils containing 2.5% or greater organic matter) fluid ounces. …

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Remain Aware of the Potential for Herbicide Carryover in 2013

  • April 8, 2013

Ideally, soil-residual herbicides should provide several weeks of weed control but not persist long enough in the soil environment to cause damage to rotational crops.  Dry soil conditions, similar to what most of Illinois experienced during the 2012 growing season, often slow the rate of herbicide degradation and increase the potential for damage to rotational crops from herbicide carryover.  Some remember the dry growing season of 1998 and the problems encountered in 1989 due to the persistence of one or more soil-residual herbicides that did not adequately degrade in the dry soil conditions of 1988. …

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University of Illinois hosts International Agronomy Day

  • March 27, 2013

Agriculturists around the world are invited to engage in a global food production discussion during International Agronomy Day at the University of Illinois on August 26.
The U of I Department of Crop Sciences encourages producers from around the globe to participate in this unique forum bringing its nationally renowned faculty together to share the latest in agronomy, weed science, crop production, pest management, agricultural economics and more.
German Bollero, head of the Department of Crop Sciences,…

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Memorial to Dr. Marshal McGlamery

  • March 8, 2013

Dr. Marshal D. McGlamery, Professor Emeritus of Weed Science at the University of Illinois passed away January 25, 2013 in Suffolk, Virginia. Dr. McGlamery was world renowned for his knowledge and expertise in weed management. His unique talents for communicating his extensive knowledge with individuals and audiences were equally renowned. During his 35-year career in the professorial ranks at the University of Illinois, untold numbers of students, farmers and agricultural professionals benefitted from Dr. McGlamery’s undaunted passion for helping others better understand and manage unwanted vegetation.…

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