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By Lizabeth Stahl, Extension Educator in Crops

Interested in cover crops and soil health?  Take advantage of the opportunity to hear from National Soil Health Spokesperson for the USDA Natural Resource Conservation Service (NRCS), Ray Archuleta, at the "Cover Crops in a Corn/Soybean Rotation Field Day" on November 13th.  Ray, also known as "Ray the Soils Guy", speaks about soil health and agroecology throughout the country.  He will be joining the speaker line-up at this event, which is focused on integrating cover crops into a corn/soybean rotation.

North Central Weed Science Society Meeting Dates & Location

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If you would like to learn more about the latest developments in herbicide resistant crop technology, advances in herbicide resistant weed management, the role of cover crops in weed management and more, please attend the North Central Weed Science Society meeting to be held from December 1-4, 2014 at the Hyatt Regency hotel in Minneapolis.

Got Weeds? Evaluate Your Weed Control Program

By Lizabeth Stahl, Extension Educator in Crops and Jeff Gunsolus, Extension Agronomist, Weed Science

By the end of the growing season, it is not too hard to spot soybean fields where weed control was less than optimal.  Prior to harvest, waterhemp can be found towering over soybean canopies throughout Minnesota.  Taking some time to evaluate effectiveness of your weed control program now can help enhance future weed control and ultimately protect yield potential and enhance profitability in the long run. 

A Closer Look at Herbicide Rotation Restrictions

By Lizabeth Stahl, Extension Educator in Crops

What herbicides were applied earlier in the growing season can significantly influence the decision of what to do in fields or areas of a field where the original crop was flooded or hailed out.  Planting some kind of a crop can help reduce erosion potential as well as reduce the risk of fallow syndrome (see http://z.umn.edu/fallowsyndrome).  However, options can be limited if a herbicide used previously in the growing season has rotational or plant-back restrictions listed on the label.

By Lizabeth Stahl and Lisa Behnken, Extension Educators in Crops  

Access to results for many of the U of MN crops research trials conducted across the state has now become streamlined with the launch of the new, U of MN Extension Crops Research website.  This one-stop shop can be accessed through the U of MN Extension Crops webpage at www.extension.umn.edu/crops under "Research Reports".

The website contains results for small plot and on-farm crops research and demonstration trials conducted across Southern MN from 2003 to 2013.  You can also access research results for crops trials conducted at Research and Outreach Centers located across the state by clicking on the respective link.  Statewide results for weed science research can be accessed through the "Applied Weed Science" link, and results for the Minnesota hybrid and variety trials can be accessed through the "Minnesota Field Crops Variety Trials" link. 

The Research Reports webpage supplements U of MN Crops websites such as the "Corn", "Soybean", "Small Grains", "Forages", or "Sugarbeets" websites, or the "Nutrient Management", "Pest Management", "Ag Drainage", "Climate and Weather", and "Tillage" websites, where you can find research-based information and resources to help with specific crops-related decisions. 

By Lizabeth Stahl, Extension Educator in Crops

Benefits of a preemergence (PRE) herbicide application in soybean were demonstrated through the "PRE Challenge" - a series of on-farm research and demonstration trials conducted across southern MN in 2012 and 2013. In these University of Minnesota Extension trials, made possible through financial support of the Minnesota Soybean Research and Promotion Council, cooperators compared a postemergence-only herbicide program to a program that included a PRE herbicide application.

By Lizabeth Stahl, Extension Educator in Crops

Does glyphosate perform as well today as it did when you first used it?  When producers were asked this question at University of Minnesota Private Pesticide Applicator Training sessions across southern Minnesota in 2014, 87% of the respondents said "No".  This percentage is up significantly from 2009, when 55% of respondents answered "No" to this question.  Increasing issues with resistance to glyphosate is likely, at least in part, behind reported reductions in weed control.  To address issues of reduced weed control with glyphosate, diversification is key. 

By Lizabeth Stahl and Lisa Behnken, Extension Educators in Crops

University of Minnesota Extension has recently launched a U of MN Extension Crops YouTube video site. It can be accessed through the newly updated U of MN Extension Crops webpage at www.extension.umn.edu/crops under "Social Media".

U of M Conservation Tillage Conference in St. Cloud, Feb 18-19

How-to information, expert advice, practical tips

By Jodi DeJong-Hughes, Extension Educator - Crops and Conservation Tillage Conference Coordinator

 

Roll up your sleeves for some practical, hands-on information that will save you soil, time, fuel -- and money. Conservation tillage is the focus of the ninth annual University of Minnesota Extension Conservation Tillage Conference and trade show Feb. 17 and 18, at the Holiday Inn and Suites, St. Cloud, MN. This conference emphasizes proven farmer experience and applied science. Straight from the trenches, learn how heavier, colder soils aren't necessarily the challenge they're made out to be. And, what have long-time no-tillers and reduced-tillage farmers learned that could spare you the same lessons?

Weed Management in Prevented Planting Acres

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By Jeffrey L. Gunsolus, Extension Agronomist - Weed Science

The wet weather pattern this spring and early summer has left a significant number of acres, especially in southeastern MN, unplanted.  Current estimates in southeastern MN project 30% of the tillable acres have not been planted and on many of these acres weeds such as giant ragweed, common lambsquarters and waterhemp are thriving. 

Although weeds are beneficial from an erosion control perspective their rapid growth will make seedbed preparation for planting cover crops very difficult and weed seed production potential will challenge even the best weed management tactics available in 2014.

Volunteer Corn: It's More Than a Weed Control Issue

By Lizabeth Stahl, Extension Educator - Crops

Volunteer corn has become one of the more prevalent weeds in fields across the Midwest. Conditions experienced in 2012, however, have combined to create almost a perfect storm in some fields for potentially high volunteer corn populations in 2013.

By Lizabeth Stahl, Extension Educator - Crops, and Jeff Gunsolus, Extension Agronomist - Weed Science

With very tight windows of opportunity to plant this year, preemergence herbicides may not have been applied as planned.  Application of a residual herbicide prior to planting or emergence of the crop, in both corn and soybean, is a great weed management strategy overall and also a key tool in managing against herbicide resistance.  What are some of our options if soybeans emerged before a preemergence herbicide application was made?   

U of MN Field Crop Trials Bulletin Available

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By Lizabeth Stahl

The University of MN Field Crop Trials Bulletin is now available in print and electronic forms. The new publication, dated January 2013, provides results from U of MN trials conducted in 2012 across the state. The varieties tested are from both public and private breeding programs and include U of MN developed forage, grain, and oilseed crop varieties.

By Liz Stahl, Extension Educator - Crops and Jeff Coulter, Extension Corn Agronomist

Results of the 2012 University of Minnesota corn grain and silage trials are available online at the following links:

2012 Corn Grain Hybrid Trial Results: http://z.umn.edu/corn2012

2012 Corn Silage Hybrid Trial Results: http://z.umn.edu/cornsilage2012

Results are based on replicated trials conducted at multiple locations across Minnesota to provide growers and agronomists with an unbiased source of information on hybrid performance. 

In September, 2011, University of Minnesota Extension, partnered with NDSU Extension, brought you the Tires, Traction, and Compaction Field Day near Fergus Falls, MN. There are now four videos highlighting the key messages presented during the day. Each video takes you to the unique soil pits constructed for that day to illustrate soil structure and effects of equipment traffic on soils. Each video is under six minutes yet captures the field experience for those unable to attend. They represent a great refresher for the 200+ participants who were there.

Spider Mites in Soybeans

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We've been getting calls about spider mites in soybeans, not surprising given our high temps and the dry conditions in some locations. As temps get into the 90's, spider mite reproduction and development rates increase significantly. Drought also exacerbates spider mite populations, and when drought conditions are relieved by rain, spider mite populations may not necessarily decrease. Consequently, even after drought conditions pass, best to continue scouting for spider mites damage.

Spider mites are tiny and only large females are visible to the naked eye (unless you've got really good eyesight!). The best way to see spider mites is to shake a plant over a piece of white paper - any moving pieces of dirt are likely spider mites... So to scout for something that small, it's best to look for damage. Spider mite damage will first appear as small yellow spots (stippling) on lower leaves. There is currently no solid treatment threshold in soybeans, but If stippling reaches mid-canopy leaves, a treatment is likely necessary. Pyrethroids may flare spider mite populations, spreading mites and increasing their populations.

A good source for information on spider mite biology, scouting and thresholds was prepared last year by Bruce Potter and Ken Ostlie and is available at:

http://www.extension.umn.edu/agriculture/soybean/pest/managing-two-spotted-spider-mites-on-soybeans/

Keep scouting!

By Dean Malvick

With most of the soybean and corn crop emerged and growing across Minnesota - it is a good time to assess fields for seedling disease problems and the potential benefits or failures of seed treatments.  The recent fluctuating temperatures and abundant rainfall that resulted in surplus topsoil moisture in about 21% of the state last week (USDA-NASS data) have created good conditions for seedling diseases and root infection by a complex mix of pathogens in many fields.  Scattered problems with seedling diseases have been reported.

John A. Lamb and Daniel E. Kaiser
Soil Fertility Specialists

Nitrogen is important for corn growth. This has been a concern on growers' minds since March. First concern was with the poor tillage conditions last fall. Did the nitrogen applied stay in the soil. We attempted to answer that question in a March 18 E-news. At the time of that E-news, drought was the weather condition on everyone's mind. Now with the record rainfalls, there are concerns if nitrogen has been lost to leaching or denitrification.

Volunteer Corn - An Issue in Corn and Soybean

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By Liz Stahl and Jeff Coulter

Growers are finding high populations of volunteer corn in their fields this spring.  Factors likely contributing to this include lodging in many fields last fall due to poor stalk quality and drought conditions, and higher harvest losses due to low grain moisture at harvest.  Other factors that can lead to high populations of volunteer corn the following year include storm damage and ear droppage.  The question arises:  When are populations of volunteer corn high enough to warrant control?  

Written by: Dr. Jeff Stachler, University of Minnesota and North Dakota State University and edited by Al Cattanach, Mark Bredehoeft, and Mike Metzger

Questions from sugarbeet growers have been coming in to Extension and Sugarbeet Cooperative Ag Staff about how to properly manage glyphosate-resistant waterhemp. The three Sugarbeet Cooperatives and Jeff Stachler recently met to determine the best strategy to manage glyphosate-resistant waterhemp in Roundup Ready sugarbeet.

Now is the time to develop a plan and take control of herbicide-resistant weeds before they take control of you. Due to the long-term exposure to glyphosate in the corn and soybean cropping system, we are now in a situation where the probability of finding a glyphosate-resistant giant or common ragweed or waterhemp is high.

Weeds: END OF SEASON WEED CONTROL REMINDERS

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written by Dr. Jeff Stachler, Weed Scientist, UMN and NDSU

Scouting fields for weeds throughout the growing season is extremely important to maintaining herbicide effectiveness and planning for future weed control decisions. Scout fields now and at harvest to determine the effectiveness of this season's weed control practices. If weeds are present now, determine why they are present. If weeds are present due to herbicide resistance, then weed control and cropping practices must be different next season and beyond.

Tires, Traction, and Compaction Field Day

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University of Minnesota Extension is proud to partner with NDSU Extension to bring you Tires, Traction, and Compaction Field Day on September 1, 2011 south of Fergus Falls, MN. Registration for the day starts at 9:00 am and discussion and demonstrations will continue until 2:30. The event will be held rain or shine.

Take Control of Waterhemp Field Tour

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Wednesday - July 6, 2011


3:30 PM to 5:30 PM

Dinner provided at 6:00 PM


Whom should attend? Sugarbeet and Soybean Growers, Consultants, Agronomists, Retailers, and Others

What is the tour about? Viewing plots for Managing glyphosate-resistant waterhemp throughout the crop rotation, especially sugarbeet and soybean.


Author: Dr. Jeff Stachler U of MN Extension and NDSU Agronomist - Sugarbeet/Weed Science

Sugarbeets have emerged or are beginning to emerge. That means it is time to begin postemergence herbicide applications to sugarbeet. Timing of the first postemergence herbicide application is the MOST critical weed management tactic, regardless of the type of sugarbeet planted.

By Jeff Stachler, Jeff Gunsolus and Rich Zollinger

Waterhemp is an annual weed species in the pigweed family that is capable of producing greater than 1 million seeds per plant and due to a limited number of effective herbicides, especially in sugarbeet and soybean, is difficult to control compared to most weed species.  In addition to the production of large quantities of seeds, continual germination throughout the growing season and an increased frequency of herbicide-resistant biotypes adds to the degree of difficulty in keeping this weed species under control.  The good news is that the longevity of waterhemp seeds in the seedbank is relatively short compared to most species (1 to 12% survival after 4 years), meaning complete control (zero seed production) of all plants over a three to four year time period should significantly reduce the waterhemp seed bank densities, allowing the farmer to take control of this difficult weed problem.

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