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Control Weeds before Planting

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. …

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Corn Herbicide/Insecticide Precautions

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. …

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Herbicide Resistance: Are Soil-Applied Herbicides Immune?

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. …

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Applying Dicamba Prior to Planting

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

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. …

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Memorial to Dr. Marshal McGlamery

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.…

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