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Extension Number

WC 94

Description

The success of weed management programs, more specifically herbicide programs, varied considerably during 2012 reflecting the importance of environmental conditions on herbicide performance. Variability of success was seen not only in the postemergence herbicide applications that continue to dominate herbicide use but also in the soil-applied residual herbicides; all herbicide applications were strongly influenced by tillage system, crop planting date, timing and amount of rainfall, and resulting weed emergence timing. While more soil-applied herbicides were used in Iowa during 2012, there are still too many acres of corn and soybean that are treated only with glyphosate. Importantly, the trend of no new herbicide sites of action continues and while new herbicides will be available in 2013, they have old sites of action, many of which have existing resistant weed populations. The new products and changes in herbicides will be described in this paper. The implications of the 2012 drought on herbicide degradation and the potential for herbicide carryover will be addressed. Furthermore, an update on the development of new herbicide resistant crops and the anticipated implications of these technologies when deregulated and available commercially will be discussed.

Publication Date:

12-2013

Publisher:

Iowa State University Extension and Outreach

City:

Ames, IA

Keywords:

Agronomy, Weed Science

Disciplines:

Agricultural Science | Agriculture | Agronomy and Crop Sciences | Weed Science

Disclaimer

Iowa State University Extension and Outreach publications in Digital Repository @ Iowa State University are made available for historical purposes only. The information contained in these publications may be out of date. For current publications and information from Iowa State University Extension and Outreach, please visit http://www.extension.iastate.edu.

2013 Herbicide Guide for Iowa Corn and Soybean Production

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