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Integrated Crop Management News

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High Mortality Rates For Bean Leaf Beetle In Northern Iowa, Ashley Dean, Erin W. Hodgson Apr 2021

High Mortality Rates For Bean Leaf Beetle In Northern Iowa, Ashley Dean, Erin W. Hodgson

Integrated Crop Management News

Bean leaf beetle adults (Photo 1) are susceptible to cold weather and most will die when air temperatures fall below 14°F (-10°C). However, they have adapted to winter by protecting themselves from harsh temperatures under plant debris and loose soil. Each spring, adult beetles emerge from their overwintering habitat and migrate to available hosts, such as alfalfa, tick trefoil, and various clovers. As the season progresses, bean leaf beetles move to preferred hosts, like soybean. While initial adult activity can begin before soybean emergence, peak abundance often coincides with early-vegetative soybean.


Termination Timing Of Cereal Rye Cover Crop For Improved Weed Control In Soybean, Prashant Jha Apr 2021

Termination Timing Of Cereal Rye Cover Crop For Improved Weed Control In Soybean, Prashant Jha

Integrated Crop Management News

Current cooler weather conditions are posing challenges for growers with a cereal rye cover crop to get it terminated. However, for growers planning to plant soybeans into the rye cover crop, there may be a perk to letting the rye cover crop accumulate more biomass. That perk being the cover crop biomass can help with weed suppression. The ability of cereal rye to suppress weeds is directly related to the biomass accumulation at the time of termination.


Spring Forage Management Considerations, Aaron Saeugling, Rebecca K. Vittetoe Apr 2021

Spring Forage Management Considerations, Aaron Saeugling, Rebecca K. Vittetoe

Integrated Crop Management News

Pasture and forages stands have really started to green-up. Here are some fertilizer and weed management considerations and recommendations to help make the most out of pasture and forage stands this year.


Check Fieldwatch® Before Pesticide Applications, Elizabeth Danielson Apr 2021

Check Fieldwatch® Before Pesticide Applications, Elizabeth Danielson

Integrated Crop Management News

Prepare for a safe pesticide application season by checking the FieldWatch® registry before making pesticide applications. The FieldWatch® registry provides easy-to-use, accurate, and secure online tools to enhance communications and awareness between crop producers, beekeepers, and pesticide applicators.FieldWatch® features a voluntary mapping tool through Google Maps™ that shows pesticide applicators the locations of registered sensitive crops and beehives so they can make informed decisions regarding pesticide applications. Taking the time to review what is near a field prior to applications helps prevent off-target application problems and helps commercial applicators comply with the Iowa Bee Rule.


To Terminate Or Not To Terminate?, Robert G. Hartzler Apr 2021

To Terminate Or Not To Terminate?, Robert G. Hartzler

Integrated Crop Management News

Current cool temperatures increase the risk of failures in terminating cover crops. While cereal rye continues to grow during these conditions, activity of herbicides is reduced. Translocation of glyphosate to growing points is reduced under cool temperatures, slowing activity and increasing the potential for control failures. It is generally recommended to avoid applications when nighttime temperatures fall below 40 F, and we prefer temperatures at application to be at least in the mid-50s with clear skies. Based on current forecasts, herbicide applications to terminate in many areas of the state should be delayed until more favorable conditions exist.


Alfalfa Weevils Active Throughout Southern Iowa, Ashley Dean, Erin W. Hodgson Apr 2021

Alfalfa Weevils Active Throughout Southern Iowa, Ashley Dean, Erin W. Hodgson

Integrated Crop Management News

Adult alfalfa weevils become active and start laying eggs as soon as temperatures exceed 48°F. Like other insects, the development of alfalfa weevil depends on temperature, and we can use accumulation of growing degree days (GDD) to predict activity. Alfalfa weevil egg hatching begins when 200-300 GDD (base 48°F) have accumulated since January 1.


Seedcorn Maggots Get An Early Start, Ashley Dean, Erin W. Hodgson Apr 2021

Seedcorn Maggots Get An Early Start, Ashley Dean, Erin W. Hodgson

Integrated Crop Management News

Seedcorn maggot is a seed and seedling pest of corn and soybean. The larvae, or maggots, feed on germinating corn and soybean seeds or seedlings (Photo 1). Feeding can delay development or kill the plant. Plant injury is especially prevalent during cool and wet springs when plants are growing slowly. Infestations tend to be field-wide instead of in patches like for many other pests. To confirm seedcorn maggot injury, check field areas with stand loss and look for maggots, pupae and damaged seeds (hollowed out seeds or poorly developing seedlings).


Preemergence Herbicides, Dry Soils And Rain, Robert G. Hartzler Apr 2021

Preemergence Herbicides, Dry Soils And Rain, Robert G. Hartzler

Integrated Crop Management News

The potential for continued dry weather across the state raises concerns about the impact of dry soils on preemergence herbicides. Preemergence herbicides kill weeds by being absorbed into the seed as the seed imbibes water. To be effective, the herbicide must be located within the soil profile at the depth where weed seeds germinate (primarily the upper inch of soil). In addition, there must be sufficient water to keep the herbicide dissolved in soil water. Both factors can be adversely affected by limited rain early in the season.


Best Management Practice For Spatial Layout Of Field Trials, Ryan W. Bergman Mar 2021

Best Management Practice For Spatial Layout Of Field Trials, Ryan W. Bergman

Integrated Crop Management News

If you are planning on conducting field trials this growing season, how you set up the field trial can determine the accuracy of your yield data at harvest. To reap the full benefits of gathering yield data to improve crop management and influence input decisions, it should be part of your management plan year-round.


2020 Summary Of Foliar Fungicide Applications On Corn In Iowa, Alison E. Robertson Feb 2021

2020 Summary Of Foliar Fungicide Applications On Corn In Iowa, Alison E. Robertson

Integrated Crop Management News

This article summarizes 2020 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.


2020 Summary Of Herbicide Evaluations For Marestail (Horseweed) Control In Soybean, Prashant Jha Feb 2021

2020 Summary Of Herbicide Evaluations For Marestail (Horseweed) Control In Soybean, Prashant Jha

Integrated Crop Management News

Marestail is one of the most widespread and troublesome weeds in Iowa croplands. It can grow to a height of 1.5 to 6 feet, produce up to 200,000 seeds, and can reduce soybean yields up to 80% if not controlled (Figure 1). Marestail seeds are light and disperse across landscapes with winds. Seeds have little dormancy and can germinate soon after seed shed. In general, 75% of seedlings germinate in fall, remain in rosette-stage until spring, begin stem elongation in April, and start flowering in July. About 25% of seeds germinate in the spring. Due to these unique ...


Isu Scn-Resistant Soybean Variety Trial Program Results For 2020, Gregory L. Tylka Jan 2021

Isu Scn-Resistant Soybean Variety Trial Program Results For 2020, Gregory L. Tylka

Integrated Crop Management News

Iowa State University evaluates nematode control and yield performance of soybean varieties with resistance to soybean cyst nematode (SCN) in SCN-infested fields throughout Iowa each year. The work is supported by the soybean checkoff through the Iowa Soybean Association.


Summary Of 2020 Insecticide Evaluations For Soybean Pests, Erin W. Hodgson, Ashley Dean Jan 2021

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

Integrated Crop Management News

Each year, the ISU Soybean Research Laboratory conducts insecticide efficacy evaluations for soybean aphid, and two emerging pests, Japanese beetle and soybean gall midge, were added in 2019. Details about pest biology, research plot design, sampling methods, and additional results can be found here.


Herbicide Programs For Waterhemp Control In Soybean, Prashant Jha Jan 2021

Herbicide Programs For Waterhemp Control In Soybean, Prashant Jha

Integrated Crop Management News

Waterhemp is a dioecious (male and female flowers on separate plants) pigweed with a high genetic diversity. Consequently, this pigweed has a high propensity to adapt to control tactics and has evolved resistance to herbicides from as many as 6 or 7 different herbicide groups (HGs). Out of 75 waterhemp populations collected from corn/soybean fields in Iowa in fall 2019, almost 25% had a four-way multiple resistance to HGs 2 (ALS inhibitors), 5 (atrazine), 9 (glyphosate), and 14 (PPO inhibitors). It is important to use a diverse herbicide program with multiple, effective sites of action to reduce overreliance on ...


Soybean Varieties With Scn Resistance Other Than Pi 88788, Gregory L. Tylka Dec 2020

Soybean Varieties With Scn Resistance Other Than Pi 88788, Gregory L. Tylka

Integrated Crop Management News

There are hundreds of soybean varieties with resistance to the soybean cyst nematode (SCN). An updated list of SCN-resistant varieties in maturity groups 0, 1, 2, and 3 for 2021 was published as Iowa State Extension publication PM 1649 in November 2020 and is available here.


Statewide Soybean Foliar Fungicide Evaluation In 2020, Daren S. Mueller Dec 2020

Statewide Soybean Foliar Fungicide Evaluation In 2020, Daren S. Mueller

Integrated Crop Management News

With support from the soybean checkoff through the United Soybean Board, Iowa State University researchers evaluated foliar fungicides on soybean in 2020. Because dry weather affected all seven field locations, this year was really an evaluation of fungicides largely in the absence of disease. Seventeen fungicides were tested at the R3 (beginning pod) growth stage, at the recommended label rate. Unlike the previous few years, frogeye leaf spot (Cercospora sojina) was only identified at the McNay Memorial Research and Demonstration Farm (Chariton), and was very low severity (1%). No frogeye leaf spot was observed at the other six Iowa State ...


Scn-Resistant Soybean Varieties For Iowa - By The Numbers, Gregory L. Tylka Nov 2020

Scn-Resistant Soybean Varieties For Iowa - By The Numbers, Gregory L. Tylka

Integrated Crop Management News

The soybean cyst nematode (SCN) is one of the most damaging pathogens of soybeans in Iowa and throughout the United States. Fortunately, there are soybean varieties bred to be resistant to the pathogen, and farmers can help manage for SCN by growing an SCN-resistant soybean variety. These varieties tend to yield well as a result of keeping the SCN feeding and reproduction in check.


Consideration For Tillage Decision This Fall After Drought, Mahdi Al-Kaisi Oct 2020

Consideration For Tillage Decision This Fall After Drought, Mahdi Al-Kaisi

Integrated Crop Management News

The dry, warmer-than-normal growing season this year presents significant challenges for managing soil and crop residue this fall.


Be Cautious When Interpreting Fall Soil-Test Results Following Drought, Antonio Mallarino, John E. Sawyer Oct 2020

Be Cautious When Interpreting Fall Soil-Test Results Following Drought, Antonio Mallarino, John E. Sawyer

Integrated Crop Management News

Sampling soil this fall following the dry conditions this past summer, and in some places continuing up to this time, may result in lower than expected soil-test results for phosphorus (P), potassium (K), and pH. Especially if soil samples are collected before any significant rainfall. Therefore, farmers and crop consultants should interpret those soil-test results with caution.


Fall Is A Great Time To Sample Fields For Scn – Especially In 2020, Gregory L. Tylka Oct 2020

Fall Is A Great Time To Sample Fields For Scn – Especially In 2020, Gregory L. Tylka

Integrated Crop Management News

Most farmers and those who advise them likely have heard that the soybean cyst nematode (SCN) is a top yield-reducing pathogen of soybean in the Midwest. What they might not know or remember is that:


Combine Gathering Attachments For Lodged Corn, Shawn Spouse Sep 2020

Combine Gathering Attachments For Lodged Corn, Shawn Spouse

Integrated Crop Management News

Wind damage or stalk rots can cause lodged corn that is difficult to gather with standard corn harvesting equipment. Powered attachments for corn heads are available to assist the gathering process and reduce the number of missed stalks and ears. These attachments assist the flow of corn stalks up and over the snouts and into the gathering chains and cross augers. While required travel speed may still be significantly reduced from normal, these attachments can greatly reduce head plugging and field gathering losses. This article will discuss several combine head attachments to assist in gathering lodged corn and has resources ...


Corn Rootworm Monitoring Network Summary, Ashley Dean, Erin W. Hodgson Sep 2020

Corn Rootworm Monitoring Network Summary, Ashley Dean, Erin W. Hodgson

Integrated Crop Management News

A monitoring network was established this year to monitor corn rootworm adults in Iowa cornfields, similar to the moth trapping network we manage in the spring each year. The goal was to help farmers and agronomic professionals monitor populations of northern corn rootworm (NCR) and western corn rootworm (WCR) in their fields and assess management decisions. A secondary goal was to estimate the ratio of NCR to WCR throughout the state and describe changing ratios into the future. The sampling protocol used is detailed at the end of the article.


2020 Drought And Derecho Impacted Corn-Harvest, Mycotoxin Testing And Storage, Erin Louise Bowers, Charles R. Hurburgh, Alison E. Robertson Sep 2020

2020 Drought And Derecho Impacted Corn-Harvest, Mycotoxin Testing And Storage, Erin Louise Bowers, Charles R. Hurburgh, Alison E. Robertson

Integrated Crop Management News

The August 10 derecho left portions of Iowa with broken, uprooted, and damaged corn across a significant portion of the state. Paired with drought conditions across the state, especially in west central Iowa, growers should be on the lookout for mycotoxin issues in this years’ crop, especially aflatoxins and fumonisins, as discussed in “Drought and Derecho Increase Mycotoxin Risk in 2020 Iowa Corn Crop-Scouting and Monitoring Fields”. For fields that are intended to be harvested, considerations for harvest, mycotoxin testing, and storage are presented below.


Drought And Derecho Increase Mycotoxin Risk In 2020 Iowa Corn Crop-Scouting And Monitoring Fields, Erin Louise Bowers, Charles R. Hurburgh, Alison E. Robertson Sep 2020

Drought And Derecho Increase Mycotoxin Risk In 2020 Iowa Corn Crop-Scouting And Monitoring Fields, Erin Louise Bowers, Charles R. Hurburgh, Alison E. Robertson

Integrated Crop Management News

The majority of Iowa is currently in moderate to severe drought, with west central Iowa under the most extreme drought. As if drought were not enough, we were dealt another blow with extreme and widespread wind damage on August 10, some of which overlapped the drought area. With these events come an increased risk for ear rots and associated mycotoxins. This article will address ear rots and mycotoxins of particular concern this year, in addition to scouting methods and monitoring considerations while grain is still in the field.


Sampling Downed Corn For Damage, Kapil Arora, Charles R. Hurburgh Sep 2020

Sampling Downed Corn For Damage, Kapil Arora, Charles R. Hurburgh

Integrated Crop Management News

The Derecho storm on August 10 left fields with varying degrees of downed corn. In the weeks following the storm, the condition of the corn plants has worsened and the quality of the corn grain appears to be deteriorating. This deterioration in quality is expected to increase with time.


Water Quality Impacts Of Cover Crop Following A Drought, Matthew J. Helmers Sep 2020

Water Quality Impacts Of Cover Crop Following A Drought, Matthew J. Helmers

Integrated Crop Management News

The dry conditions throughout large areas of Iowa during 2020 reminds us of Iowa’s last significant drought in 2012 and the subsequent impacts on nitrate-N levels in subsurface drainage the following spring. This article will address concerns for water quality in drought conditions and opportunities to reduce nutrient losses from fields this fall.


Cover Crop Options To Consider For Damaged Crops This Fall, Mike Henderson, Mark A. Licht Aug 2020

Cover Crop Options To Consider For Damaged Crops This Fall, Mike Henderson, Mark A. Licht

Integrated Crop Management News

Many fields have been ravaged by adverse weather this year in Iowa. On top of drought and hail we had a devastating derecho steam-roll a wide swath of Iowa starting in Sac County and progressing eastward along Highway 30. Along with the decision of how to handle this year’s crop, consideration for protecting the soil and preparing for next year’s crop should include cover crops.


Silage Harvest Of Drought-Stressed And Severely Lodged Corn, Brian J. Lang Aug 2020

Silage Harvest Of Drought-Stressed And Severely Lodged Corn, Brian J. Lang

Integrated Crop Management News

The decision to chop corn for silage should be made when there is no further potential to increase grain dry matter and whole plant moisture is in the proper range for the storage structure. The proper harvest moisture content is the same for drought stressed and normal corn. Recommended whole plant moisture contents are 65-70% in horizontal silos (trenches and bunkers), 60-70% for bags, 60-65% for upright stave silos, and 50-60% for upright oxygen limiting silos.


Harvest And Storage Of Weather-Damaged Corn For Silage, Brian Dougherty Aug 2020

Harvest And Storage Of Weather-Damaged Corn For Silage, Brian Dougherty

Integrated Crop Management News

Extreme weather events may lead to a decision to make corn silage rather than harvest corn for grain, or to harvest acres that will exceed current silage storage capacity. Before harvesting for silage, make sure you have a market for the silage or a sufficient number of livestock to feed it to. It may be difficult to harvest good quality corn silage if the crop has weather damage and the economic value of the silage will likely be lower than silage from non-damaged fields. The resources section has links to information that can help with pricing forages in the field ...


Wind Damaged Corn – Nutrient Content?, John E. Sawyer, Antonio Mallarino Aug 2020

Wind Damaged Corn – Nutrient Content?, John E. Sawyer, Antonio Mallarino

Integrated Crop Management News

The August 10, 2020 high winds (derecho) caused lodged or flattened corn in many Iowa fields. The corn development ranged mainly from stages R3 (milk) to R5 (dent). Some fields may not be harvested, some chopped for silage, and some harvested for grain. Nutrients such as nitrogen (N), phosphorus (P), and potassium (K) remaining in the field may be different than with normal harvest due to partial plant removal, grain harvest, or grazing. Therefore, adjustments can be made for future fertilizer or manure applications.