Stevan Knezevic - Extension Weed Management Specialist

Stevan Knezevic

faculty

Tenure Assoc Professor Agronomy & Horticulture University of Nebraska–Lincoln
Professor Northeast Research & Extension Center University of Nebraska–Lincoln

Work

57905 866 Rd Concord NE 68728-2828

Work 402-584-3808 On campus, dial 7-3808

sknezevic2@unl.edu

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Faculty Bio

Cottonwoods — Figure 1. Cottonwood infestation in sub-irrigated meadow. This photo was taken during the period of high water table in early spring. (Photo by Stevan Knezevic)

Research Findings on Chemical Control of Cottonwood May 22, 2018

Cottonwood offers many benefits, but also can be an invasive and difficult-to-control weed. Nebraska researchers studied control efficacy of eight herbicides over two years and found three products provided total control more than a year; however, they also noted a caution for areas with high water tables.

Field trial comparing timing of soybean weed management — Figure 1. (left) Soybean without preemergence herbicide at V6 stage and (right) soybean with preemergence herbicide at V6 stage.

Preemergence Herbicides Delayed the Critical Time for Weed Removal in Soybean May 16, 2018

Researchers tested two herbicide strategies in soybean to see how preemergence herbicides would delay the critical time of weed removal, likely reducing the number of herbicide applications needed in a season.

Field photos of the three herbicide treatments tested. — Figure 1. Three herbicide treatments were applied to determine whether a pre-emergence herbicide affected the critical period of weed control. From left, the plots show: 1) Corn at V12 that had not received a pre-emergence herbicide; 2) corn at V12 that received an atrazine treatment; corn at V12 that received an Acuron treatment

Preemergence Herbicides Influence the Critical Period for Weed Removal in Roundup Ready Corn May 11, 2018

Researchers tested three preemergence herbicide strategies in Roundup-Ready Corn to identify how their application affected the critical period of weed control — the period when weed control is essential to avoid yield loss.

Sensitivity of Grape and Tomato to Micro-rates of Dicamba-Based Herbicides May 3, 2018

Researchers report on a study to confirm the level of sensitivity of grapes and tomatoes to 1/10 and 1/100 of the label rate of dicamba. The studies were conducted with pot-grown grape and tomato plants during the summers of 2016 and 2017 at the Haskell Ag Lab.

Planning Ahead for Winter Wheat: Review Corn and Soybean Herbicide Programs April 13, 2018

If you're considering planting winter wheat next fall, be sure to review the corn and soybean herbicide programs you plan to use this spring to avoid rotation restrictions that would limit your cropping options.

Photo of field trial studying management of glyphosate-resistant ragweed

Herbicide Options for Managing Glyphosate-resistant Common Ragweed in LibertyLink Soybean March 1, 2018

Results from a 2017 weed management trial on glyphosate-resistant ragweed indicated two applications were often more efficient and cost effective than either three applications or one application of herbicide.

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.

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.