Herbicides

Weeds aren’t going away any time soon. In fact, as resistance grows, it’s becoming more important than ever to know what herbicides are working, how they work together and even if they aren’t working.

May 14, 2012

Article

Monitor Weed Control with Aerial Imagery

It’s been another abnormal spring and many farmers have had to adjust some of their management practices. Specifically, the combination of the unusual weather and a need to get control of glyphosate-resistant weeds has increased the need to more closely scrutinize weed-management programs....More
May 14, 2012

Article

Tips for Nitrogen, Herbicide Application on Emerged Corn

The rapid pace of planting in late April followed by rain has resulted in many fields having emerged corn before pre-emergence herbicide and nitrogen applications have been completed. Of particular concern are no-till fields where planting was completed prior to killing emerged weeds....More
May 11, 2012

Article

Customize Postemergent Herbicide Applications

"In general, postemergent applications should be made before weeds get taller than 2-4 in., because that's when competition can begin to impact yields," says WinField Regional Agronomist Steve Barnhart. "Plus small weeds are a lot easier to control than larger ones." Because every field is different, there isn't a one-size-fits-all approach to turn to when it comes to planning postemergent herbicide applications....More
May 4, 2012

Article

Apply Postemergence Herbicide to Small Weeds in Corn

"The smaller the weed, the better," says University of Illinois Associate Professor of Weed Science Aaron Hager. Proper timing of the application of postemergence herbicides provides the corn crop with the best opportunity to express its full genetic yield potential. Allowing weeds to compete with the crop for too long reduces its seed yield. Yield losses can accumulate very rapidly, and the associated costs can far exceed the cost of an integrated weed management program that includes a properly timed application of a postemergence herbicide....More
Apr. 19, 2012

Article

Options to Control Emerged Corn Before Replant

University of Illinois associate professor of weed science Aaron Hager says that the below-freezing temperatures last week damaged some emerged corn in some parts of Illinois. “While the damage appears not to be widespread, it is very likely that some growers will opt to replant damaged stands,” he says. Losses of the initial corn stand could range from complete to partial, so farmers may need to control existing corn plants before replanting....More
Apr. 6, 2012

Article

Are Your Multiple-Mode Herbicides Effective?

Interest in using multiple modes of herbicide action in weed management programs is increasing, according to Aaron Hager, University of Illinois associate professor of weed science. However, each component of a herbicide premix or tankmix with multiple modes of action is not necessarily effective for every weed or under all application conditions....More
Mar. 20, 2012

Article

Early Herbicide Applications Could Fail Farmers

Although the calendar shows it's March, many Midwest farmers are preparing their fields for spring planting like it's the middle of April. That's not necessarily a good thing, says Purdue Extension Weed Specialist Bill Johnson....More
Mar. 8, 2012

Article

Atrazine Not Likely to Exceed Drinking Water Standard in Agricultural Groundwater

A new model predicts that atrazine, plus its breakdown product deethylatrazine, has less than a 10% chance of exceeding the U.S. EPA's standard for public drinking-water supplies in shallow groundwater in about 95% of the nation’s agricultural areas. Atrazine is a commonly used herbicide for weed control in corn and sorghum production....More
Feb. 10, 2012

Article

Spring Seed Cover Crops to Help Recover Flooded Fields

There was considerable flooding along the Missouri River in summer 2011, leaving many fields scarred and bare, without a crop. Producers should make field repairs as needed and seed a cover crop to help protect the soil and start rebuilding soil life before the 2012 cropping season. Cover crops benefit flood-damage soils in several ways....More
Feb. 10, 2012

Article

Spring Marestail Management Strategies

Ohio State University research on marestail management has shown that a systems approach, involving a combination of herbicide applications, provides the most consistently effective control and reduction in marestail population over time. Given that essentially all of the marestail populations in the state are glyphosate-resistant by now, and something like 25% of these are also resistant to ALS inhibitors (Classic, FirstRate), POST applications are often the least important application in a marestail control program....More