Weed Management

Wheat streak mosaic virus in wheat — Severe wheat streak mosaic virus in a wheat field in Deuel County on May 15, 2017. (Photo by Stephen Wegulo)

Why Control of Volunteer Wheat is Critical to Protecting 2018 Yields July 13, 2017

Timely control of volunteer wheat and other weeds is key to managing yield loss risk in your 2018 crop. Yield-limiting risk factors affected by weed control include wheat streak mosaic and other diseases, insects (wheat stem sawfly and disease vectors), moisture loss, and increased weed seed production.

Liberty Link soybeans — Figure 1. Control of glyphosate-resistant common waterhemp with Valor XLT applied PRE followed by Liberty in Liberty Link soybean (Photos by Amit Jhala).

Liberty Label Revision Allows Rate Increase July 13, 2017

Liberty has revised its label to provide for an increased application rate in corn and soybean. View the new label rates for corn and soybean with a cumulative maximum per year of 87 fl oz/acre for either crop.

Soybean field pre-canopy — Figure 1. Soybean field at North Platte, weeks away from reaching full canopy. Photo taken 7/4/2017.

Soil-Residual Herbicide Options For “Slow-To-Canopy” Soybeans July 7, 2017

Soil-residual herbicides are encouraged to enhance weed control options in slow-to-canopy soybeans reported across Nebraska.

Market Journal: Using Dicamba, Irrigation Management & More July 7, 2017

Segments on this week's Market Journal address using dicamba, managing irrigation, research on the profitability of using precision agriculture, the forecast for next week and four upcoming hands-on, crop management clinics in eastern Nebraska.

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.

Palmer amaranth in corn — Figure 1. Glyphosate-resistant Palmer amaranth infesting corn field in south central Nebraska. (Photos by Amit Jhala)

Grower Q&A: Is this Herbicide-Resistant Palmer Amaranth? June 23, 2017

This week growers facing challenges with Palmer amaranth questioned whether it was due to the product, the environment and lack of rain, or a resistant weed. Several factors could be at play, notes a UNL weed scientist, who recommends starting with preemergence herbicides with residual activity to get the best control.

Weed escapes in soybean after preemergence application — Figure 1. A soybean field in south central Nebraska without preemergence herbicide application. Applying a well-timed postemergence herbicide will be the only control option. (Photos by Amit Jhala)

Consider Application Restrictions of Postemergence Herbicides Based on Soybean Growth Stage June 19, 2017

It's important to consider soybean growth stage and preharvest interval when applying postemergence herbicides to avoid potential crop injury. This article describes how to determine crop growth stage and includes a table of application restrictions for common postemergence herbicides.