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Integrated Crop Management News

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Preemergence Herbicide Application Timings: Pros And Cons, Robert G. Hartzler, Meaghan J. B. Anderson, Prashant Jha Apr 2020

Preemergence Herbicide Application Timings: Pros And Cons, Robert G. Hartzler, Meaghan J. B. Anderson, Prashant Jha

Integrated Crop Management News

Preemergence herbicides are the foundation of herbicide-based weed management systems, and effective use of these products is essential to protect crop yields and reduce selection pressure for herbicide resistant weeds. In a perfect world, applying preemergence herbicides immediately after planting would provide the greatest likelihood of maximum performance, but equipment and labor availability limit many farms from using this approach. This article will provide a brief overview of the pros and cons of different application strategies


Are You Planting On A Level Playing Field?, Ryan W. Bergman Apr 2020

Are You Planting On A Level Playing Field?, Ryan W. Bergman

Integrated Crop Management News

Springtime on a farm is typically filled with the hustle and bustle of gearing up for planting season. This is the time of year when most farmers focus on de-winterizing the sprayer, changing oil in the tractors and checking the seed meters on the planter. If you use a field cultivator, it is also important to make sure it is properly adjusted to help provide a uniform seedbed for the upcoming planting season. Whether this is the first season or the thirtieth season for the field cultivator, there are a few items to check before making your way to the ...


Pesticide Applications – Are You Prepared?, Elizabeth Danielson, Kristine J. P. Schaefer Apr 2020

Pesticide Applications – Are You Prepared?, Elizabeth Danielson, Kristine J. P. Schaefer

Integrated Crop Management News

With the critical need for respirators and other personal protective equipment (PPE) for health care, there is a potential shortage of PPE, particularly N95 respirators, in the marketplace for agriculture and pesticide applications.


Spring Forage Fertilization Considerations, Brian J. Lang, Rebecca K. Vittetoe Apr 2020

Spring Forage Fertilization Considerations, Brian J. Lang, Rebecca K. Vittetoe

Integrated Crop Management News

Fertilization is just as important for forages as it is for row crops to maximize productivity. This article addresses spring fertilization considerations for forage crops and pastures.


Deadline Waived For Iowa Pesticide Applicators To Renew Certification, Kristine J. P. Schaefer Mar 2020

Deadline Waived For Iowa Pesticide Applicators To Renew Certification, Kristine J. P. Schaefer

Integrated Crop Management News

The Iowa Department of Agriculture and Land Stewardship (IDALS) has waived the deadline for pesticide applicators to meet recertification requirements, following a proclamation by Iowa Gov. Kim Reynolds March 22.


The Opportunities And Challenges With Hemp, Chad Hart Mar 2020

The Opportunities And Challenges With Hemp, Chad Hart

Integrated Crop Management News

Over the past several years as row crop prices declined, farmers and landowners across the nation have searched for alternative crops that might improve the financial bottom line. With the passage of the 2014 and 2018 farm bills, industrial hemp became one of those possible alternative crops. The 2014 farm bill established industrial hemp (hemp with a tetrahydrocannabinol [THC] concentration of 0.3% or less) as a potential crop, separating it from its illegal relative, marijuana. The 2018 farm bill removed hemp from the list of controlled substances and established hemp as an agricultural commodity, including the provision of crop ...


Terminating Cover Crops This Spring, Meaghan J. B. Anderson, Rebecca K. Vittetoe, Robert G. Hartzler Mar 2020

Terminating Cover Crops This Spring, Meaghan J. B. Anderson, Rebecca K. Vittetoe, Robert G. Hartzler

Integrated Crop Management News

As temperatures warm this spring, cover crop termination is on the to-do list for some Iowa fields. Killing cover crops with herbicides is the most common termination method. The effectiveness of herbicides at terminating a cover crop depends primarily on three things:

1. Cover crop species and growth stage

2. Herbicide and rate used

3. Environment


Recommendations To Achieve High Quality Dry Fertilizer Applications, Ryan W. Bergman Mar 2020

Recommendations To Achieve High Quality Dry Fertilizer Applications, Ryan W. Bergman

Integrated Crop Management News

Claims of poor fertilizer application and visual striping in fields have increased in recent years. This issue impacts all sectors of the supply chain including growers, custom applicators, cooperatives and agribusiness insurance companies. An increase in documented application problems is primarily driven by a broader use of aerial imagery that can easily detect problems and an increase in use of dry nitrogen fertilizers. Cases of poor-quality application are seen less frequently with phosphorus or potassium products than with nitrogen because corn is not as sensitive to varying rates of these nutrients. Prior to applying dry fertilizer, follow these guidelines to ...


Crop Sulfur Fertilization This Spring, John E. Sawyer Mar 2020

Crop Sulfur Fertilization This Spring, John E. Sawyer

Integrated Crop Management News

Significant sulfur (S) deficiency in Iowa crops was first documented about 15 years ago. First identified in alfalfa and then corn and soybean. Since then about 150 trials with corn (along with trials with alfalfa and soybean) have been conducted across the state, with approximately 50% of trials having a statistically significant yield increase. A main reason for the yield response to S in recent years, as compared to many years prior, has been reduction in atmospheric deposition as a result of the Clean Air Act. Other factors for increased S responses include fields with no manure applications, increased crop ...


Managing Winter Annual Weeds This Spring, Meaghan J. B. Anderson, Robert G. Hartzler Mar 2020

Managing Winter Annual Weeds This Spring, Meaghan J. B. Anderson, Robert G. Hartzler

Integrated Crop Management News

After another relatively wet fall, late harvest season, and mild winter, early weed management may be important this spring for those who have persistent issues with winter annuals such as field pennycress and horseweed/marestail in no-till. Winter annuals resume growth soon after the arrival of warm temperatures, so as soon as fields are fit, the weeds will be susceptible to spray.


Management Considerations For Slugs: Do Insecticides Work?, Ashley Dean, Erin W. Hodgson Mar 2020

Management Considerations For Slugs: Do Insecticides Work?, Ashley Dean, Erin W. Hodgson

Integrated Crop Management News

With recent weather patterns, specifically high rainfall leading to wet soil conditions, some farmers have experienced damaging populations of slugs in their no-till fields. No-till fields are particularly affected since increased residue provides a stable, cool, and wet environment for these animals that are prone to desiccation (drying out). Oftentimes, farmers wonder if insecticides or seed treatments are effective at managing these noninsect pests. We will discuss management options for slugs in this article.


Legally Operating A Drone In The Agriculture Industry, Ryan W. Bergman Mar 2020

Legally Operating A Drone In The Agriculture Industry, Ryan W. Bergman

Integrated Crop Management News

Drone activity in agriculture continues to increase, and the aerial imagery generated can provide unique insight throughout the crop production season. Over the past decade the Federal Aviation Administration (FAA) has continued to evolve the requirements for the operation of small unmanned aerial systems (sUAS, UAS, UAV or drones) to create a reasonable legal pathway for use in agriculture.


Management Considerations For Millipedes And Isopods: Do Insecticides Work?, Ashley Dean, Erin W. Hodgson Mar 2020

Management Considerations For Millipedes And Isopods: Do Insecticides Work?, Ashley Dean, Erin W. Hodgson

Integrated Crop Management News

Many states, including Iowa, received a record amount of precipitation in 2019. In fact, the past two growing seasons have been especially wet. Consequently, this has created a number of issues for farmers, including reports of millipedes damaging crops under no-till production in Iowa, which is likely due to a combination of wet conditions and high residue. People that experience millipedes under these conditions frequently ask if insecticides or seed treatments will provide control of these pests. Although millipedes are not insects, they commonly fall under the realm of entomology, alongside many other animals (spiders, centipedes, mites, etc.). We will ...


High Speed Planting Technology, Ryan W. Bergman Mar 2020

High Speed Planting Technology, Ryan W. Bergman

Integrated Crop Management News

Iowa State University (ISU) recently completed a five-year study of high-speed planter equipment in corn and soybeans. The study utilized a 12-row planter equipped with the Precision Planting SpeedTube high speed planter system and a 24-row planter equipped with the John Deere ExactEmerge high speed planter system (Figure 1). Both planters utilized individual row hydraulic downforce and were tested using a side-by-side strip trial experimental design. Each planter was used on approximately 400 acres per year. Additionally, a third planter with a standard drop tube seed delivery system was included in select fields for seed spacing comparisons.


Spring Corn Nitrogen Fertilization Considerations, John E. Sawyer Mar 2020

Spring Corn Nitrogen Fertilization Considerations, John E. Sawyer

Integrated Crop Management News

Perhaps you did not get planned nitrogen (N) applications accomplished last fall. Or you are pondering what the spring 2020 weather conditions might be – another wet spring? Are you are considering use of different products; if so how should they be handled?


Managing Residual Herbicides With Cover Crops, Robert G. Hartzler, Meaghan J. B. Anderson Feb 2020

Managing Residual Herbicides With Cover Crops, Robert G. Hartzler, Meaghan J. B. Anderson

Integrated Crop Management News

A common question when incorporating cover crops into a production system is, will the cover crop interfere with the performance of residual herbicides included with the burndown treatment? This article will discuss the fate of residual herbicides applied to crop residue and living cover crops, and how this may influence herbicide effectiveness.


Sprayer Maintenance Tips For Spring, Ryan W. Bergman Feb 2020

Sprayer Maintenance Tips For Spring, Ryan W. Bergman

Integrated Crop Management News

Prior to spring field operations, ensuring your equipment is ready can save valuable time and reduce stress when windows get tight due to weather conditions. The sprayer is a critical piece of equipment in most crop production operations. Ensuring your sprayer is mechanically sound, clean, and properly setup will help ensure quality and timely applications of spring fertilizer and pesticides.


Corteva™ To End Chlorpyrifos Production: What Does This Mean For Iowa Farmers?, Ashley Dean, Erin W. Hodgson Feb 2020

Corteva™ To End Chlorpyrifos Production: What Does This Mean For Iowa Farmers?, Ashley Dean, Erin W. Hodgson

Integrated Crop Management News

Chlorpyrifos is an organophosphate insecticide (Group 1B; IRAC) used to kill insects and mites on crops, buildings, animals, and other settings. All indoor uses of chlorpyrifos were phased out in the 2000s. Chlorpyrifos products are restricted-use pesticides, meaning sale and use of this chemical is restricted to certified applicators.


Algorithms Used To Update State Soil Survey, Zach Clemens, Bradley A. Miller Feb 2020

Algorithms Used To Update State Soil Survey, Zach Clemens, Bradley A. Miller

Integrated Crop Management News

While seasonal weather can be the difference between a good and a bad harvest, it is the soil that moderates the long-term productivity of a field. The inherent properties of soils are vital to know when it comes to management practices on any agricultural landscape.


2019 Soybean Foliar Fungicide Trials Show Decreasing Efficiency In Qoi Class, Daren S. Mueller, Ethan Stoetzer Jan 2020

2019 Soybean Foliar Fungicide Trials Show Decreasing Efficiency In Qoi Class, Daren S. Mueller, Ethan Stoetzer

Integrated Crop Management News

Iowa State University researchers recently published their annual fungicide trial data for soybeans in 2019, revealing a continued decline in efficiency among the quinone outside inhibitors (QoI) class of fungicides in preventing foliar diseases in soybeans.


Instances Of Frogeye Leaf Spot Resistance To Qois Abundant In Iowa, Daren S. Mueller, Ethan Stoetzer Jan 2020

Instances Of Frogeye Leaf Spot Resistance To Qois Abundant In Iowa, Daren S. Mueller, Ethan Stoetzer

Integrated Crop Management News

Iowa State University researchers, with funding from soybean checkoff through the United Soybean Board and Iowa Soybean Association, have confirmed that over 70 isolates of the pathogen Cercospora sojina (cause of frogeye leafspot in soybeans in Iowa) are resistant to quinone outside inhibitor (QoI) fungicides.


Summary Of Foliar Fungicide Applications On Gray Leaf Spot And Yield Of Corn In Iowa In 2019, Alison E. Robertson Jan 2020

Summary Of Foliar Fungicide Applications On Gray Leaf Spot And Yield Of Corn In Iowa In 2019, Alison E. Robertson

Integrated Crop Management News

This article summarizes our 2019 corn foliar fungicide trials that were done at six locations in Iowa: ISU Northwest Research and Demonstration Farm (NWRF), Sutherland; Northeast Research and Demonstration Farm (NERF), Nashua; Northern Research and Demonstration Farm (NRF), Kanawha; Southwest Research and Demonstration Farm (SWRF), Lewis; Southeast Research and Demonstration Farm (SERF), Crawfordsville; and the Ag Engineering and Agronomy Farm (AEA) near Boone.


Summary Of 2019 Insecticide Evaluations For Soybean Pests, Erin W. Hodgson, Ashley Dean Jan 2020

Summary Of 2019 Insecticide Evaluations For Soybean Pests, Erin W. Hodgson, Ashley Dean

Integrated Crop Management News

The 2019 growing season was challenging for farmers in many parts of the state, especially because cold and wet soil conditions in April significantly delayed planting. Thistle caterpillar was the most abundant insect statewide, though multiple species of caterpillars, Japanese beetle, soybean aphid, and soybean gall midge were observed in soybean.


Income In Scn-Infested Fields Can Be $200 Per Acre Less With Pi 88788 Than With Peking Resistance, Gregory L. Tylka Jan 2020

Income In Scn-Infested Fields Can Be $200 Per Acre Less With Pi 88788 Than With Peking Resistance, Gregory L. Tylka

Integrated Crop Management News

The results of a field experiment conducted in 2019 with the soybean cyst nematode (SCN) in southeast Iowa were dramatic and alarming. The data illustrate what likely could occur in SCN-infested fields throughout the state in future years.


Choosing A Corn Hybrid Or Soybean Variety, Mark A. Licht Nov 2019

Choosing A Corn Hybrid Or Soybean Variety, Mark A. Licht

Integrated Crop Management News

Choosing corn hybrids and soybean varieties is one of the most important crop management decisions to be made. It is a hard decision to make because it is typically made months before the growing season begins. This article will explore where to find yield trial information, how to interpret yield trials, and what to consider in selecting cultivars.


Considerations For Continuous Corn, Mark A. Licht Nov 2019

Considerations For Continuous Corn, Mark A. Licht

Integrated Crop Management News

Continuous corn is a "three strikes and you’re out" situation. And the first strike is automatic – high residue volume. This is how a farmer recently described it to me.


Scn-Resistant Soybean Varieties For 2020, Gregory L. Tylka Nov 2019

Scn-Resistant Soybean Varieties For 2020, Gregory L. Tylka

Integrated Crop Management News

Resistant varieties continue to be a key tool for managing the soybean cyst nematode (SCN). With financial support from the soybean checkoff through the Iowa Soybean Association, Iowa State University annually compiles a list of SCN-resistant soybean varieties that are available for use in Iowa.


Managing Scn For 2020 Should Begin Now, Gregory L. Tylka Nov 2019

Managing Scn For 2020 Should Begin Now, Gregory L. Tylka

Integrated Crop Management News

Now that the 2019 corn and soybean harvest is in full swing, it is not too early to start thinking about and planning for the 2020 growing season as well. For soybean farmers in Iowa, a critically important fall activity that can pay large dividends is soil sampling to determine soybean cyst nematode (SCN) population densities in fields in which soybeans will be grown in 2020. Also, some farmers might consider sampling fields for SCN in which soybeans were grown in 2019 that produced disappointing yields for no apparent reason. Often, SCN infestations are found in areas of fields in ...


Corn Residue Breakdown As Affected By Tillage And N Application, Mahdi Al-Kaisi Nov 2019

Corn Residue Breakdown As Affected By Tillage And N Application, Mahdi Al-Kaisi

Integrated Crop Management News

Crop residue serves an important role in physically protecting soil from erosion during rain events or high winds, as well as enhancing the soil biological activity by providing sources of organic carbon and nitrogen for its energy needs. In order to understand how residue decomposes, we need to understand how the degradation processes are influenced by environmental and soil conditions; namely, air and soil temperatures, soil moisture availability, soil pH, oxygen, and type of microbial community. The composition of crop residue includes lignin, cellulose, hemicellulose, and macro and micronutrients. Certain biological and enzymatic processes, controlled by a wide range of ...


Fall Fertilizer Nitrogen Application, John E. Sawyer Oct 2019

Fall Fertilizer Nitrogen Application, John E. Sawyer

Integrated Crop Management News

Fall nitrogen (N) fertilizer application continues to be popular for several reasons, including lower cost, time for application, equipment availability, often better soil conditions, and competing springtime field activities. Success, compared to spring or sidedress timing, can be enhanced by following several long-standing suggestions: only use anhydrous ammonia; apply in late fall after soils cool to 50 degrees F (4-inch depth) and are trending cooler (the colder the better); consider an effective nitrification inhibitor to further slow nitrification to nitrate; and avoid fall application to soils that are more prone to wetness or leaching (poorly or excessively drained soils).