Integrated Crop Management News

Links to these articles are strongly encouraged. Articles may be republished without further permission if published as written and if credit is given to the author, Integrated Crop Management News, and Iowa State University Extension and Outreach. If articles are used in any other manner, permission from the author is required.

Dicamba and Dicamba-Resistant Soybean Varieties

March 18, 2016

On February 3, 2016, Monsanto announced commercial launch plans for soybean varieties resistant to dicamba and glyphosate (designated Roundup Ready 2 Xtend varieties). This announcement followed China’s decision to approve grain from these varieties for import. Many weed management practitioners hope the use of this new technology will improve control of challenging weeds, including those with evolved resistance to glyphosate and herbicides from other groups.

Approaches for Managing Corn Rootworm in Iowa

March 16, 2016
Corn Rootworm injury

Corn rootworm is a persistent and economically important pest in Iowa, with yield loss caused primarily by larval feeding on corn roots. Genetically modified corn with Bt traits kills western and northern rootworm larvae, and Bt-rootworm corn has been available since 2003.

The Source Matters for Getting the Most out of Aerial Imagery

March 10, 2016
Aerial Imagery photo

As spring plans are finalized, don’t forget to consider aerial imaging as part of a continuous improvement plan. Remote sensing and the use of aerial imagery has been used for decades in agriculture but since 2010 we’ve seen the number of available imagery providers grow extensively. The use of imagery can vary from farm to farm but several common uses include variable rate fertility recommendations, assessing water management performance, quantifying soil compaction and machinery induced yield limiters, locating late season weed outbreaks, and generally evaluating the consistency of crop vigor across a field. 

Selecting Nozzles for Postemergence Herbicides

February 15, 2016

An earlier ICM News article discussing affects of nozzle type and size on spray coverage prompted a question from a farmer regarding nozzle selection. In recent years there have been many advances in nozzle design. The primary improvement has been development of nozzles that minimize the formation of driftable droplets (< 200 micron) while still producing a droplet spectrum that provides the level of coverage required for consistent, postemergence weed control.

Managing Two Soybean Pests to Optimize Yield

February 11, 2016
Effectiveness of Aphid-resistant soybeans graph

Soybean cyst nematode (SCN) and soybean aphid (SBA) are important soybean pests in the north-central region. Soybean varieties with host plant resistance for SCN (PI88788) and SBA (Rag1) can suppress pest populations and subsequently protect yield. In addition, seed treatments are becoming widely adopted and now can include a nematacide, fungicides and insecticide. Combining host plant resistance with seed treatments could potentially further protect yield.

Spray Volume is Critical for Postemergence Herbicides

February 10, 2016
Effect of nozzle type and size on driftable droplets

Proper herbicide application is critical to ensure products achieve their full potential for weed control.  For postemergence herbicides, this includes application to appropriately sized weeds and equipping the sprayer to achieve uniform coverage of target weeds.

Nation’s Premier Site for Water Quality Drives Progress

January 28, 2016
Water Quality image

A farm just outside the north-central Iowa town is home to Iowa State University’s Agriculture Drainage Research and Demonstration Site, a facility that has been working to further Iowa State University’s water conservation efforts since 1990.

Breaking Down Resicore - Does It Pass the Test?

January 27, 2016

The first line of defense against herbicide resistance is using herbicide programs that include multiple herbicide groups effective against target weeds. When using premix products, this involves comparing the application rates of active ingredients in the premix versus rates applied with the stand-alone products. This step is needed to insure that the premix is providing an effective dose of the active ingredient.