1005FallAppliedHerbicidessr.cfm Malatya Haber Scout field before making post-harvest herbicide application
Home News Livestock Crops Markets Hay, Range & Pasture Home & Family Classifieds Resources This Week's Journal
Commerical Hay Equipment For The Farm
Agro-Culture Liquid Fertilizer

Farm Survey

Journal Getaways

Reader Comment:
by Eliza Winters

"I think that the new emission standards are a great move. I think that the"....Read the story...
Join other discussions.

Scout field before making post-harvest herbicide application

Post-harvest herbicide application provides an additional opportunity to manage problematic weed species including winter annuals, biennials, and perennials, said University of Illinois associate professor of weed science Aaron Hager.

"Be sure to scout fields before making any application to determine what weeds are present and if their densities are high enough to warrant treatment," he advised. "Many herbicides used prior to or after crop planting/emergence can be used in the fall, but not all herbicides are labeled for fall application. Also, some herbicides approved for fall application have application timing restrictions."

Herbicides that do not have much soil-residual activity (for example, 2,4-D or glyphosate) should be applied after the majority of winter annual species have emerged. A mid- to late-October application might be more effective than one in early October. However, if the fall application will include a herbicide with soil-residual activity, it can be applied earlier.

Horseweed/marestail (Conyza canadensis) populations are increasing in minimum and no-tillage cropping systems across parts of the Midwest. Horseweed completes its life cycle in one year, but unlike many other annual species, it may exist as a winter or summer annual.

Winter annual horseweed populations typically emerge in the fall, within a few days or weeks after seed is dispersed from the parent plant. With the increasing prevalence of horseweed, including glyphosate-resistant populations, fall herbicide applications may work better than spring applications. Glyphosate alone may not provide adequate control no matter when applied, but a higher application rate of products (such as 2,4-D) can be used in fall than in spring.

"We do not recommend fall herbicide applications as a method to provide residual control of summer annual weed species," Hager said.

Applying soil-residual herbicides fairly close to, instead of several weeks (or months) prior to, planting can improve control of summer annual species, such as waterhemp. If a soil-residual herbicide will be part of a fall herbicide application, use an application rate that will provide control of winter annuals throughout the rest of 2012. "We recommend against increasing the application rate with the idea of controlling summer annual species next spring," Hager said.

Date: 10/22/2012

Web hpj.com

Copyright 1995-2014.  High Plains Publishers, Inc.  All rights reserved.  Any republishing of these pages, including electronic reproduction of the editorial archives or classified advertising, is strictly prohibited. If you have questions or comments you can reach us at
High Plains Journal 1500 E. Wyatt Earp Blvd., P.O. Box 760, Dodge City, KS 67801 or call 1-800-452-7171. Email: webmaster@hpj.com


Archives Search

NCBA Convention

United Sorghum Checkoff Program

Inside Futures

Editorial Archives

Browse Archives