Stevan Knezevic - Extension Weed Management Specialist

Stevan Knezevic

faculty
Work Keim Hall (KEIM) 102C
Lincoln NE 68583-0915
US
Work 402-472-6498 On campus, dial 2-6498

Faculty Bio

click to read Industrial Hemp Tolerance to Flame Weeding

Industrial Hemp Tolerance to Flame Weeding

November 30, 2020
Hemp exhibited relatively good tolerance to heat from propane flaming. Temporary injury could be considered acceptable since it was only at the base of the plants and lasted only for about two weeks.

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links to Industrial Hemp Tolerance to Late-POST Herbicides

Industrial Hemp Tolerance to Late-POST Herbicides

November 18, 2020
Hemp exhibited high level of sensitivity to most of the tested herbicides. Visual injury levels ranged from almost no injury (~5%) with only one herbicide, to some temporary injury (~20%) with a few herbicides and severe injury or death (60%-93%) with about 10 out of 18 herbicides tested.

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hemp showing minor herbicide injury

Industrial Hemp Tolerance to Early-POST Herbicides

November 11, 2020
Hemp exhibited relatively good tolerance to several products that can be used postemergence in industrial hemp. It is important to note that the conclusions are based only on one year of data. This study will be repeated in 2021 season.

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soybean showing Dicamba injury

USEPA Approves Three Dicamba Products for Five Years

October 29, 2020
On Oct 27, 2020, The United States Environmental Protection Agency (USEPA) announced a new 5-year registration for XtendiMax® and Engenia, and re-registered Tavium (a premix of dicamba and S-metolachlor).

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links to Industrial Hemp Varieties Exhibit the Same Tolerance Level to PRE-Herbicides

Industrial Hemp Varieties Exhibit the Same Tolerance Level to PRE-Herbicides

October 7, 2020
Herbicides registered for in-season weed control in industrial hemp are scarce, or nonexistent. To help with this issue, a greenhouse study was conducted this summer at the University of Nebraska-Lincoln to test tolerance of three industrial hemp varieties to preemergence herbicides commonly used in corn and soybean.

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hemp showing herbicide injury

Industrial Hemp Tolerance to Soil-applied Herbicides

July 8, 2020
Nebraska legalized industrial hemp in 2019, which created much interest in researching various aspects of hemp production, including weed control. A recent study looked at hemp tolerance to 18 soil-applied herbicides commonly used for preemergence weed control in corn or soybean.

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herbicide being applied to soybean field

Ninth Circuit Court Orders Cancellation of Three Dicamba Products - Updated

June 6, 2020
On June 8, 2020 the EPA release a statement providing farmers with needed guidance following the Ninth Circuit Court ruling.

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Dicamba damage in soybeans

Ninth Circuit Court Orders Cancellation of Three Dicamba Products

June 5, 2020
The United States Court of Appeals for the Ninth Circuit issued a ruling on June 3, 2020 that immediately cancelled the registration of XtendiMax®, FeXapan®, and Engenia® primarily used in dicamba-resistant soybean, also known as Roundup Ready 2 Xtend® soybean.

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