Agronomic Updates

BETWEEN THE ROWS
WYFFELS TECHNICAL BULLETINS

Managing Corn Rootworm
Both Northern and Western Corn Rootworm have been pests in the Corn Belt for many years and are widely distributed in corn growing regions. Corn rootworm management is likely becoming a system that includes a combination of different management practices for the best results. The Between the Rows will cover what to be looking for in corn fields, as well as some best management practices for corn rootworm.

Japanese Beetles Impacting Corn and Soybean Fields
High populations of Japanese beetles are routinely found across the Midwest corn and soybean production areas. Feeding by adults can be a serious problem both in corn and soybeans. Thus scouting is crucial, especially during the reproductive stages of both crops.

Effects of Flooding and Saturated Soils on Corn
Recent and forecasted rain events across the Midwest will lead to many fields with saturated and flooded soils. Areas of these fields that are not flooded with standing water may still remain saturated for an extended period of time. Survival of corn plants is dependent on temperature, stage of growth and length of time the soil is saturated.
 

Effects of Compaction on Corn Seedlings
The establishment and early growth of nodal roots is a very important step in corn plant development. Restrictions can lead to stunted corn seedlings and have a lasting impact on yield potential. Sidewall compaction and soil compaction can restrict root growth and lead to lost yield.
 

Black Cutworm and True Armyworm 2013 Update
Black cutworm and true armyworm are sporadic pests in the Midwest. They do not over winter as adults, but the moths are carried north each spring by southerly winds. The moths do not cause economic damage, but the eggs they deposit eventually hatch into larvae which cause damage by feeding on young seedlings.
 

Early Season Cold Stress
Many factors, both environmental and field specific, will influence the extent of damage that will occur from cold stress early in the season. Knowing what symptoms to look for and having patience when evaluating damage will allow you to make the best decision for your corn crop.
 

Understanding Nitrogen Loss
Nitrogen is one of the most yield-limiting inputs, and we can control the amount available to our crop. But it’s also one of our most costly inputs, so the decision to apply supplemental nitrogen has to be well thought out. Understanding the factors which influence nitrogen loss will help growers determine their specific situation and help them
make more informed decisions.
 

Early Season Corn Pests and Diseases
Success in 2013 starts at planting. Ensuring corn is planted into a favorable environment will maximize its chance of successful germination. Knowing the most susceptible fields will help you focus your scouting program. Timely scouting throughout May and June to detect early signs of pests and diseases will equip you with the information you need to make the appropriate management decision. Small reductions in stand and stunted plants can add up to significant yield reduction. Being aware of what to look for can make a difference in your success.
 

Keys for Successful Corn Germination and Emergence
Maximizing the genetic potential of a hybrid starts at planting and germination. Many factors affecting good germination and emergence are environmental, but there are things to monitor that can improve the chances of a successful start.
 

Estimating Yields In Drought Conditions
Estimating yield under drought conditions can be difficult and variable. The latest Between The Rows provides tips on how to best estimate yield under these circumstances.
 

Aflatoxin— What to do and what to look for
Wyffels Product Development Manager Bob Jackson provides information on aflatoxins, including identification and management tips.
 

Ear Rots, Kernel Mold, Aflatoxin Risks In Dry Environments
The stressful growing season may increase the potential for ear rots or kernel molds, especially Aspergillus. Early detection prior to harvest can help reduce damage to grain.
 

Managing Corn Rootworm
Last year's growing conditions were conducive to emergence and survivial of northern and western corn rootworm. This Between The Rows provides best management practices to combat the pests, especially in areas with high insect pressure.
 

Japanese Beetles Impacting Corn and Soybean Fields
High populations of Japanese beetles are occurring across the Midwest. Feeding by adult beetles can cause serious problems in corn. Scouting is crucial, especially now, during reproductive stages.

 

Emergence and Early Seedling Establishment
Growers across the Corn Belt are reporting emergence and seedling establishment issues. Most appear related to planting date and soil conditions. This Between The Rows provides information about these unusual seedling conditions.
 

Emerging Corn
Early planting and unruly weather can mean varied corn emergence. Wyffels Agronomic Marketing Manager Tom Newman provides management tips.
 

Scouting For Black Cutworms
Unseasonably warm weather and lack of freezing temperatures means black cutworm captures are already high. Tom Newman provides tips to deal with the pests.
 

Key Agronomic Practices Impacting Grower Success
Several management decisions can have a large impact on overall crop performance. Growers are advised to concentrate on key agronomic factors impacting yield first.
 

Effective Weed and Pest Control

Unseasonably warm temperatures mean weeds and bugs are making an impact early. Wyffels Product Development Manager Brent Tharp provides tips on effective weed and pest control.
 

The Risk and Reward of Planting Very Early
Unpredictable weather holds the trump card for gaining yield when planting earlier than usual. A critical step for top performance is establishing a high population of uniform, fast-emerging seedlings. Weather risk can cause this critical step to influence the rest of the growing season and final performance.
 

Benefits and Risks of Planting Early and Optimum Dates
Wyffels Product Development Manager Bob Jackson explains benefits and risks of planting very early, optimum planting dates and replant.
 

Western Corn Rootworm Resistance and Control Concerns
Corn Rootworm pressure and the resulting control concerns are more prevalent than experienced in years. This Between the Rows provides perspective to consider for managing CRW going forward.
 

Starting With the Right Plant Population
Growers can impact final yields by starting with the right population for specific hybrids, field productivity, soil type, and yield goal. This Between the Rows highlights the importance of starting with the right planting population to ensure target population is achieved.
 

Heat and Drought Stress Impact on Corn Performance
Timing of heat and drought stress and its impact on final crop performance. Management factors that can help mitigate the potential impact of stress on the corn crop.
 

Root Lodging from Summer Storms
Growth stages that are most vulnerable to root lodging or green snap as a result of summer thunderstorms that include heavy rain and high winds. And, how growth stage affects the plant's ability to recover.
 

Black Cutworm and True Armyworm
Growth and development of these sporadic pests, what can be done to minimize potential damage, and a look at available rescue treatments.
 

Frost and Freeze Damage to Corn
Influences on the amount of damage that occurs and assessing the true extent of plant damage.
 

What is Green Snap?
Where this weather-related phenomenon primarily occurs, factors that influence the susceptibility of corn to green snap, and how to manage the risk of green snap.
 

Delaying Planting Considerations
Research on the ability of corn hybrids to adapt to delayed planting and the effects of delayed planting on corn development and yield potential.
 

Goss's Bacterial Wilt Hybrid Rating Update
Goss's bacterial wilt has received some recognition this past growing season in areas where we don't traditionally see it. Where Goss's wilt was confirmed the previous year, growers may wish to consider Goss's wilt tolerance ratings for specific hybrids when making their seed decisions.
 

Wyffels Study Investigates Yield Response to Fungicide Application
Discusses proprietary study results, understanding return on investment for fungicide applications, secondary benefits, management considerations.
See also: Wyffels Fungicide Summary, 2007-2010.
 

Hybrid Observations and Yield Estimates: Kernels—It's More than Numbers
Current crop situation, factors impacting photosynthesis, impact of temperature, yield estimates on a whole field basis.
 

Stalk Rot Diseases of Corn
The presence of stalk rot can be responsible for significant yield loss when the disease causes premature death resulting in poor ear fill or light test weights. Reviews causal organisms and agronomic management considerations.
 

Managing Corn in a Sustained Wet Environment
The impact from weeks of saturated soils during fast growth (knee-high to tasseling) can be significant. Discusses the effects and potential management options.
 

Goss's Bacterial Wilt
Over the past few years, Goss's bacterial wilt has spread across several Midwestern states. Identifies causes, symptoms, and actions to reduce the likelihood of infection next season.
 

Gray Leaf Spot
High levels of rainfall early in the season can increase the presence of leaf diseases. Discusses scouting and management practices to consider.