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Last County In Iowa Found Infested With Scn, Greg Tylka, Brian Lang Jan 2017

Last County In Iowa Found Infested With Scn, Greg Tylka, Brian Lang

Integrated Crop Management News

More than 100 fields throughout Iowa were surveyed for the presence of the soybean cyst nematode (SCN) in 2016 in a project sponsored by the ISU Soybean Research Center and the Iowa Soybean Association (ISA). Soil samples were collected by Iowa State University Extension and Outreach field agronomists and ISA staff and interns and sent to the ISU Plant and Insect Diagnostic Clinic for processing.


Performance Of Scn-Resistant Soybean Varieties In Iowa In 2016, Greg Tylka Dec 2016

Performance Of Scn-Resistant Soybean Varieties In Iowa In 2016, Greg Tylka

Integrated Crop Management News

Soybean varieties that are resistant to the soybean cyst nematode (SCN) are essential tools for managing the pest. Resistance to SCN requires multiple genes, and soybean varieties bred to be resistant may not contain all of the resistance genes necessary to provide maximum nematode control. Consequently, SCN control can vary greatly among resistant soybean varieties, just as yield.

Iowa State University evaluates the SCN control and yield of SCN-resistant soybean varieties in field experiments conducted throughout Iowa annually. The effort is supported, in part, by soybean checkoff funds from the Iowa Soybean Association.


What’S The Situation With Scn In Your Fields?, Greg Tylka Oct 2016

What’S The Situation With Scn In Your Fields?, Greg Tylka

Integrated Crop Management News

The soybean cyst nematode (SCN) is capable of causing serious yield loss on soybeans every year and is widespread throughout Iowa and much of the Midwest. In the “good ole days,” a farmer was “good to go” with SCN management if he or she knew what fields were infested with the nematode and then grew SCN-resistant soybean varieties in rotation with the nonhost crop corn. Nowadays, though, things are a little more complicated.

The fact is, your SCN numbers may be building up unbeknownst to you. This buildup can go unrecognized because a soybean crop often does not appear stressed ...


More Scn-Resistant Soybean Varieties Than Ever, But Diversity Of Resistance Is Lacking, Greg Tylka Oct 2016

More Scn-Resistant Soybean Varieties Than Ever, But Diversity Of Resistance Is Lacking, Greg Tylka

Integrated Crop Management News

Nearly 40 years after its discovery in the upper Midwest, the soybean cyst nematode (SCN) continues to be a highly damaging pathogen of soybeans in Iowa and surrounding soybean-producing states. SCN is most damaging in hot, dry growing seasons, but yield losses of 10% to 25% or more can occur in years when temperatures are moderate and rainfall is average or above average. Growing SCN-resistant soybean varieties can slow the build-up of SCN population densities (numbers) in the soil and produce profitable soybean yields in SCN-infested fields.


Cold Temperatures And Burndown Herbicides, Robert G. Hartzler Apr 2016

Cold Temperatures And Burndown Herbicides, Robert G. Hartzler

Integrated Crop Management News

The weather forecast appears to be favorable for field activities so people will be anxious to get into the field. A concern for many will be the effect of the widespread freeze on the performance of burndown herbicides. Unfortunately, there is no simple blanket statement that can be made since the plant response will vary depending on weed species, weed size, and the herbicides used.


2015 Evaluation Of Commercial Seed Treatments On Soybean At Three Locations In Iowa, Alison E. Robertson, Mauricio Serrano, Stith N. Wiggs Apr 2016

2015 Evaluation Of Commercial Seed Treatments On Soybean At Three Locations In Iowa, Alison E. Robertson, Mauricio Serrano, Stith N. Wiggs

Integrated Crop Management News

In 2015, 13 currently available commercial seed treatments were evaluated at three locations in Iowa. Seed treatments that reduce the risk of seedling diseases, soybean cyst nematode (SCN) and sudden death syndrome (SDS) were included in the trial. The goal of the trials is to provide information of the effect of commercial seed treatments on stand count, disease incidence and severity, and yield of soybean. Funding is provided by Iowa Soybean Association.


Fine-Tune Oat Seeding Rate This Spring, Margaret Smith, Mary H. Wiedenhoeft, David Weisberger Mar 2016

Fine-Tune Oat Seeding Rate This Spring, Margaret Smith, Mary H. Wiedenhoeft, David Weisberger

Integrated Crop Management News

It’s time to plant small grains. When planting oats, spring wheat, and barley, farmers typically plant two to three bushels of small grains per acre, but there is a better way to optimize plant populations and grain yields. Farmers calculate corn and soybean rates by seed count and should do the same for small grains.


Terminating Cover Crops - What's Your Plan?, Meaghan J. B. Anderson, Rebecca K. Vittetoe, Robert G. Hartzler Mar 2016

Terminating Cover Crops - What's Your Plan?, Meaghan J. B. Anderson, Rebecca K. Vittetoe, Robert G. Hartzler

Integrated Crop Management News

Take time now to get a plan in place for terminating a cover crop. Whether termination will be done with a herbicide, rolling/crimping, or tillage, it is important to know not just the advantages, but also the limitations with a termination method. Regardless of termination choice, it is important to have a plan in place to minimize problems this spring.


Dicamba And Dicamba-Resistant Soybean Varieties, Robert G. Hartzler, Michael D. Owen Mar 2016

Dicamba And Dicamba-Resistant Soybean Varieties, Robert G. Hartzler, Michael D. Owen

Integrated Crop Management News

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. Weed science programs across the United States have evaluated this technology for several years, conducting field research to better understand the technology and how it might be best utilized in soybean production systems.


Approaches For Managing Corn Rootworm In Iowa, Erin W. Hodgson, Aaron J. Gassmann Mar 2016

Approaches For Managing Corn Rootworm In Iowa, Erin W. Hodgson, Aaron J. Gassmann

Integrated Crop Management News

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. However, some Iowa farmers have observed severe root injury to Bt hybrids in continuous cornfields, and there has been documented resistance of western corn rootworm in Iowa to Cry3Bb1 corn and mCry3A corn since 2009 and 2011, respectively.


The Source Matters For Getting The Most Out Of Aerial Imagery, Matthew J. Darr, Zachery S. Vanderleest, Ryan William Bergman, Christopher J. Murphy Mar 2016

The Source Matters For Getting The Most Out Of Aerial Imagery, Matthew J. Darr, Zachery S. Vanderleest, Ryan William Bergman, Christopher J. Murphy

Integrated Crop Management News

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.


Research Shows Extra Cover Crop Growth Prior To Soybeans Provides Benefits, Daren S. Mueller, Michael J. Castellano Mar 2016

Research Shows Extra Cover Crop Growth Prior To Soybeans Provides Benefits, Daren S. Mueller, Michael J. Castellano

Integrated Crop Management News

This study, funded by the United Soybean Board (USB), was conducted to understand the potential for cover crops to perform in a corn and soybean rotation, and to collect data on the performance of cover crops in those rotations in relation to the timing of termination.


Selecting Nozzles For Postemergence Herbicides, Robert G. Hartzler, H. Mark Hanna Feb 2016

Selecting Nozzles For Postemergence Herbicides, Robert G. Hartzler, H. Mark Hanna

Integrated Crop Management News

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, Erin W. Hodgson, Gregory L. Tylka, Aaron J. Gassmann Feb 2016

Managing Two Soybean Pests To Optimize Yield, Erin W. Hodgson, Gregory L. Tylka, Aaron J. Gassmann

Integrated Crop Management News

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. This article summarizes a 3-year research effort, funded by the soybean checkoff through a grant from the Iowa Soybean Association, that evaluated interactions among these two pests, host plant resistance, and seed treatments.


Spray Volume Is Critical For Postemergence Herbicides, Robert G. Hartzler, H. Mark Hanna Feb 2016

Spray Volume Is Critical For Postemergence Herbicides, Robert G. Hartzler, H. Mark Hanna

Integrated Crop Management News

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. Weed scientists at Purdue University recently reported on the influence of nozzle type and spray volume on target coverage within the soybean canopy. A traditional flat fan (XR) nozzle and three drift reduction nozzles were included in the study. The XR nozzle produced more driftable droplets than the other nozzles, and the two types of air induction nozzles had much less volume in small ...


A Call To Farmers To Assist With Soybean Yield Gap Project, Mark Licht Feb 2016

A Call To Farmers To Assist With Soybean Yield Gap Project, Mark Licht

Integrated Crop Management News

Soybean production is expected to rise to satisfy the increasing demand for food, biodiesel and livestock feed, both in the United States and globally. It is critical to reduce the yield gap, which is the difference between the attainable crop yield, as determined by the interactive effects of weather, soils and genetics, and the actual crop yield attained by the producer.


Nation’S Premier Site For Water Quality Drives Progress, Matt J. Helmers Jan 2016

Nation’S Premier Site For Water Quality Drives Progress, Matt J. Helmers

Integrated Crop Management News

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. The site was born out of the Iowa Groundwater Protection Act, a piece of legislation passed in 1987 that generated funds from fees on pesticide manufacturing registrations, pesticide dealer licensing and a tax on fertilizer sales. A portion of the funds were used to create the 11-acre research site, with Iowa State University partnering with the Iowa Department of Agriculture and Land ...


Breaking Down Resicore - Does It Pass The Test?, Robert G. Hartzler Jan 2016

Breaking Down Resicore - Does It Pass The Test?, Robert G. Hartzler

Integrated Crop Management News

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.


New Isu Research May Help Farmers Make More Informed Decisions About Land Use, Elke Brandes, Emily A. Heaton, Lisa A. Schulte-Moore, Fred Love Jan 2016

New Isu Research May Help Farmers Make More Informed Decisions About Land Use, Elke Brandes, Emily A. Heaton, Lisa A. Schulte-Moore, Fred Love

Integrated Crop Management News

A new study from a multidisciplinary team led by Iowa State University agronomists shows that significant portions of Iowa farmland consistently lose money and could influence many farmers to change how they use some of the acres they devote to corn and soybeans.


Scn Resistance Continues To Pay Twice In 2015, Gregory L. Tylka Jan 2016

Scn Resistance Continues To Pay Twice In 2015, Gregory L. Tylka

Integrated Crop Management News

Resistant soybean varieties are a vital tool for managing the soybean cyst nematode (SCN). These soybean varieties must contain several genes to be fully resistant to the nematode. Not all SCN-resistant varieties contain a full set of resistance genes. Consequently, SCN-resistant soybean varieties can vary greatly in their agronomic performance and the SCN control that they provide.


Iowa State Research Farm Reports Available To Public, Mark S. Honeyman Dec 2015

Iowa State Research Farm Reports Available To Public, Mark S. Honeyman

Integrated Crop Management News

There are fourteen Iowa State University Research and Demonstration Farms in Iowa; nine owned by associations (local farmers) and five owned by the university. One responsibility of Iowa State to the associations is to provide an annual farm progress report on the agricultural research and related scientific agriculture activities conducted at the farm as a year-end summary. Those reports, that were made available in the past to the members and others in print form, are now available online to the public athttp://fpr.extension.iastate.edu/ in a new format.


Nitrogen Loss?, John E. Sawyer Dec 2015

Nitrogen Loss?, John E. Sawyer

Integrated Crop Management News

Really, it just had to rain large amounts in December. Seems we can’t get any relief from worrying about excess rain and impacts on nitrogen (N). The questions have already begun – what about fall 2015 fertilizer and manure N applications? It is quite hard to make an estimate of losses for such an extreme event and time of the year. Following are factors to consider that will affect loss potential, including if N was applied and if so what fertilizer product or manure source.


Hindsight Is 20/20: What Can Be Learned From 2015, Mark Licht, Sotirios Archontoulis Dec 2015

Hindsight Is 20/20: What Can Be Learned From 2015, Mark Licht, Sotirios Archontoulis

Integrated Crop Management News

As the saying goes, hindsight is 20/20; perfect vision. We often say “if we knew the weather, then we can provide the best recommendations”. Usually, we do not know the weather or we do not have the appropriate tools in place, so the questions remain unanswered. Now that we know the weather, the next important question is to determine what could have been done differently in 2015. This is an important part of understanding and evaluating production and environmental performance of our crop management decisions. In this article, we leverage our knowledge of the 2015 weather and use the ...


Yield Gap Analysis: What Limited Iowa Corn And Soybean Yields In 2015, Sotirios Archontoulis, Mark Licht Dec 2015

Yield Gap Analysis: What Limited Iowa Corn And Soybean Yields In 2015, Sotirios Archontoulis, Mark Licht

Integrated Crop Management News

To evaluate how good corn and soybean yields were in 2015, farmers and agronomists compare their yields to those obtained in previous years. To answer why yields were higher or lower than past years, they develop hypotheses to explain factors that limited yields based on their own experiences, anecdotal evidence from neighbors, knowledge of crop growth and development, and weather patterns. As a next step to the in-season Yield Forecast Project, we can provide an alternative analysis and a yield gap analysis of the 2015 growing season by using the explanatory power that a cropping systems model offers. Our analysis ...


Certified Crop Adviser Exam Review Course Offered By Isu Extension, Brent A. Pringnitz Dec 2015

Certified Crop Adviser Exam Review Course Offered By Isu Extension, Brent A. Pringnitz

Integrated Crop Management News

Individuals planning to become a Certified Crop Adviser (CCA) can attend a two-day ISU Extension course to assist with exam preparation. ISU extension specialists will cover the performance objectives for the exam and provide additional assistance on topic areas of most concern to students. Students will take interactive quizzes during the course and finish with a practice examination.


Commercial Manure Applicator Training Scheduled For Jan. 6, 2011, Angela M. Rieck-Hinz Dec 2015

Commercial Manure Applicator Training Scheduled For Jan. 6, 2011, Angela M. Rieck-Hinz

Integrated Crop Management News

Commercial manure applicators can attend three hours of training on Thursday, Jan. 6, 2011, to meet annual commercial manure applicator certification requirements. Iowa State University (ISU) Extension and the Iowa Department of Natural Resources (DNR) will conduct Commercial Manure Applicator training from 9 a.m. to noon at 75 locations in Iowa, and four locations in surrounding states. Registration begins at 8:30 a.m. There is no fee for the workshop but applicators must register by Dec. 30 with the ISU Extension county office where they plan to attend. A complete list of county extension offices offering this workshop ...


Confinement Site Manure Applicator Workshops Scheduled For 2011, Angela M. Rieck-Hinz Dec 2015

Confinement Site Manure Applicator Workshops Scheduled For 2011, Angela M. Rieck-Hinz

Integrated Crop Management News

Confinement site manure applicators and anyone interested in learning about manure issues should plan to attend a two-hour workshop offered by Iowa State University (ISU) Extension in January or February 2011. These workshops are offered in cooperation with the Iowa Department of Natural Resources (DNR). There is no fee to attend the workshops, but applicators will need to pay certification fees to complete certification requirements.


Wrap Up And Validation Of The Yield Forecast Project For 2015, Sotirios Archontoulis, Mark Licht, Ranae N. Dietzel Dec 2015

Wrap Up And Validation Of The Yield Forecast Project For 2015, Sotirios Archontoulis, Mark Licht, Ranae N. Dietzel

Integrated Crop Management News

During the 2015 growing season, a group of scientists from the Department of Agronomy ran a pilot project with the objective of forecasting end-of-season yields and in-season water and nitrogen dynamics (crop demand and soil supply). In-season updates were put in past ICM News articles (June 17th, July 31st, and August 14th). Briefly, this project combined the use of a cropping systems model (APSIM), a climate model (WRF), and high-resolution, in-season measurements to create the forecasts. The project focused on eight cropping systems in 2015: two sites (Ames and Sutherland), two crops (corn and soybean), and two ...


Protect Your Investment By Eliminating Tillage And Keeping Residue, Mahdi M. Al-Kaisi Dec 2015

Protect Your Investment By Eliminating Tillage And Keeping Residue, Mahdi M. Al-Kaisi

Integrated Crop Management News

This fall, field observations with significant amounts of intensive tillage and residue removal provide an opportunity to rethink such practices by considering research proven practices such as no-tillage (NT) and strip-tillage (ST), which have demonstrated their effectiveness in many parts of the state and across the Midwest. Many studies from the Midwest and elsewhere have documented the economic benefits of NT and ST for both corn and soybean, where the conventional tillage input cost was greater than that of NT and ST by $15-25/acre in a study covering 14 years of tillage and crop rotations in Iowa.


Research Team Uses Survey To Gain Better Understanding Of Herbicide-Resistant Weeds, Michael D. Owen Nov 2015

Research Team Uses Survey To Gain Better Understanding Of Herbicide-Resistant Weeds, Michael D. Owen

Integrated Crop Management News

The spread of herbicide-resistant weeds is a growing problem in many parts of the United States, and the number of weed species with resistance to glyphosate and other herbicides has risen dramatically; contributing to lower yields and profits for farmers. An interdisciplinary team of weed scientists, economists and sociologists led by Mike Owen, university professor and weed specialist with Iowa State University and Outreach, are working to develop effective approaches to address this growing problem of herbicide resistant weeds.