Stevan Knezevic - Extension Weed Management Specialist

Stevan Knezevic

(faculty)
Work
HAL 57905 866 Rd Concord NE 68728-2828
US
Work 402-584-3808 On-campus 7-3808

Faculty Bio

Sprayer hose test

Removing Dicamba Residues from Your Sprayer: A Tricky Task February 15, 2018

Thoroughly cleaning your sprayer both before and after applying dicamba is required and can help reduce the potential for off-target damage. Check these recommended practices and see what research at Mississippi State University found when testing sprayer hoses.

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An eastern Nebraska field with dicamba injury.
This eastern Nebraska soybean field was injured by off-target dicamba movement to a sensitive crop. Applying best management practices to all dicamba applications can help reduce the likelihood of similar whole-field damage in 2018.

Can We Manage Dicamba Applications in 2018? February 15, 2018

Factors leading to dicamba injury and how growers will need to practice best management practices with all dicamba applications in 2018 to help reduce injury to susceptible crops and other plants. This article discusses key practices to implement.

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Maximum daily temperature and humdity recorded at Harvard in June 2017
Maximum daily temperature and humdity recorded at Harvard in June 2017

Potential Off-Target Dicamba Movement from Corn Applications February 15, 2018

While the new soybean dicamba herbicides were often blamed for injury to sensitive plants in 2017, a deeper look at the timing of injury and the weather conditions at those times suggests dicamba applications in corn may have contributed to plant injury in many areas. Increased management for all dicamba applications will be needed in 2018.

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Figure 1. Season-long glyphosate-resistant common ragweed competition in a soybean field near Adams.
Figure 1. Season-long glyphosate-resistant common ragweed competition in a soybean field near Adams.

Preplant Tillage to Manage Glyphosate-resistant Common Ragweed February 13, 2018

Nebraska university weed scientists conducted research in 2017 to identify the effect of preplant tillage on weed emergence in an effort to develop an integrated weed management plan to control glyphosate-resistant weeds. Here's what they found.

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Dicamba injury at various growth stages
Dicamba injury at various growth stages

Research on the Impact of Dicamba Micro-Rates on Non Dicamba-Tolerant Soybeans January 10, 2018

Research at the university's Haskell Ag Lab at Concord in 2016 and 2017 studied the effects of microrates of two dicamba products applied at one of three soybean growth stages. The trials showed that non-dicamba tolerant soybeans were sensitive to even very low micro-rates of Engenia and XtendiMax; response varied according to amount and growth stage, with exposure at later stages having less effect.

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In Figure 1a the field on the right, with heavier crop residue, shows dicamba-tolerant soybeans that had been sprayed with new generation dicamba. The field on the left, non-dicamba-tolerant soybeans planted side-by-side without a buffer, shows symptoms of injury caused by dicamba, the consequences of spray drift or volatilization. Figure 1b illustrates how dicamba affects newer growth more than older leaves. (Photos by Tim Creger, Nebraska Department of Agriculture)

Dicamba Injury Symptoms on Sensitive Crops June 28, 2017

Dicamba-resistant soybean, genetically engineered to provide resistance to dicamba and glyphosate, was made commercially available for the 2017 growing season. This article looks at potential dicamba injury to sensitive crops and plants.

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Spraying the New Phenoxy Herbicide Formulations in Xtend and Enlist Soybeans Will Present Challenges May 11, 2017

The new phenoxy herbicide formulations, including Enlist Duo™ (Dow), XtendiMax® (Monsanto), Engenia™ (BASF), and FeXapan™ (DuPont), offer growers new management options along with new application requirements. To alleviate problems related to applying new phenoxy herbicide formulations in soybeans as well as to increase herbicide performance, manufacturers have established application requirements. Here we discuss some of the key application factors to consider.

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