Blog

Bob Hartzler
August 16, 2017 7:47 AM

The following article originally appeared on the ISU Weed Science Online website.  Current research is showing that the new formulations of dicamba (Xtendimax with Vapor Grip Technology and Engenia) have not solved the volatility problem associated with dicamba.  Since the fundamentals of...

Weeds

Rebecca Vittetoe
August 15, 2017 2:20 PM

 #Drought17, late season hail damage, weed escapes, and soybean aphids seem to be the big issues ISU Extension field agronomists are seeing in fields across the state this past week. Read on for more information about your region's crop progress and field conditions.


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Crop Production

Bob Hartzler
August 15, 2017 12:49 PM

Meaghan Anderson
August 15, 2017 12:49 PM

For the first time in recent history, a contestant successfully defended their title in the Professional Division at the State Fair Weed ID Contest.  Cindy Recker of Peosta repeated as champion of the Professional Division, Karen Stiles of Des Moines won the General Division, and Henric Krause...

Weeds

Jody Korthaus
August 14, 2017 12:07 PM

Daren Mueller
August 14, 2017 12:07 PM

Adam Sisson
August 14, 2017 12:07 PM

Six teams of Iowa youth from across the state participated in the seventh annual Iowa Crop Scouting Competition on July 31 at the ISU Extension and Outreach...

Crop Production, Insects and Mites, Plant Diseases, Weeds

Angie Rieck-Hinz
August 10, 2017 8:34 AM

Meaghan Anderson
August 10, 2017 8:34 AM

Seeding Cover Crops in Dry Conditions

We are quickly approaching the time of year when we aerially seed cover crops into standing corn and soybeans.  Earlier seeding allows for more growth and consequently more biomass to protect soils from erosion. It also allows the opportunity to...

Crop Production

Rebecca Vittetoe
August 9, 2017 7:01 PM

The dry and droughty conditions, spider mites, soybean aphids, and dicamba drift are common issues ISU Extension field agronomists are seeing across the state. Read on for more information about your region's crop progress and field conditions.

Northwest Iowa

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Crop Production

Erin Hodgson
August 3, 2017 2:05 PM

According to the U.S. Drought Monitor, most of Iowa is still considered abnormally dry. Twospotted spider mites are erratic pests in some corn and soybean fields right now, particularly in southern Iowa. I’ve been...

Crop Production, Insects and Mites

Rebecca Vittetoe
August 2, 2017 7:52 AM

Rainfall continues to be scattered across the state. According to the U.S. Drought Monitor, 64% of the state is abnormally dry, 34.7% is in a moderate drought, and 1.6% is in a severe drought. ISU Extension...

Crop Production

Meaghan Anderson
July 28, 2017 4:09 PM

Rebecca Vittetoe
July 28, 2017 4:09 PM

Observations across several counties in southeast and south central Iowa show that, despite some recent rain events and high humidity, twospotted spider mites are persisting in both corn and soybean fields across the area.  These insect-like pests can be very difficult to identify, so we’ve got...

Crop Production, Insects and Mites

Rebecca Vittetoe
July 25, 2017 9:57 PM

We’ve got the terrible too’s in weather extremes across Iowa. Parts of northeast Iowa received too much rain and experienced flash flooding while many other parts of Iowa are in desperate need of rain and have seen too little rain. Iowa University Extension and Outreach...

Crop Production

Meaghan Anderson
July 24, 2017 12:11 PM

As of February 2017, Palmer amaranth (Amaranthus palmeri) had been found in 49 of Iowa’s 99 counties.  A native of the American southwest, Palmer amaranth is more competitive than common waterhemp (Amaranthus tuberculatus), a pigweed native to Iowa.  These two species are two...

Weeds

Mark Licht
July 20, 2017 2:13 PM

Sotirios Archontoulis
July 20, 2017 2:13 PM

Water and temperature affect many crop processes simultaneously ranging from crop growth, development, photosynthesis, respiration, water transpiration, grain fill, and nutrient cycling. The magnitude of high temperature or drought stress depends also on the stage of the crop. Another factor...

Crop Production

Rebecca Vittetoe
July 19, 2017 8:22 AM

The spotty rain and dry weather saga continues in many parts of the state. The U.S. Drought Monitor has just over 47% of the state as abnormally dry and 16% of the state in a moderate drought.

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Crop Production

Bob Hartzler
July 19, 2017 8:13 AM

Meaghan Anderson
July 19, 2017 8:13 AM

The 2017 State Fair Weed Identification Contest will be held on Friday, August 11, from 9:00 AM to 11:30 AM.  Contestants can show up anytime during this period and complete the task at their own pace.  

The contest is held outside of the John Deere Agriculture Building, but moves indoors...

Weeds

Jody Korthaus
July 17, 2017 12:14 PM

Daren Mueller
July 17, 2017 12:14 PM

1) Develops in hot, dry weather conditions. Charcoal rot is a fungal disease that is most severe in years and areas experiencing hot, dry weather. However, this disease can also cause losses when ample moisture is present, making it a hidden threat to yield.

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Plant Diseases

Jody Korthaus
July 14, 2017 4:13 PM

Daren Mueller
July 14, 2017 4:13 PM

The Twitter accounts @corndisease and @soydisease are a place for farmers agronomists, crop consultants, and specialists to collectively document and track...

Insects and Mites, Plant Diseases, Weeds

Bob Hartzler
July 13, 2017 8:38 AM

While off-target movement of pesticides is not a new problem, the growth regulator herbicides create a unique situation due to their ability to induce easily observed symptoms at very low doses. Large scale drift problems were experienced when the phenoxy herbicides were introduced in the 1950s...

Weeds

Rebecca Vittetoe
July 10, 2017 11:57 PM

Parts of the state are still quite dry and could use some much needed rain. Some of these areas did receive some much needed rain Monday night (July 10)/early Tuesday morning (July 11). Well some areas of the state are very dry other areas have been hit hard with storms, with the most recent...

Crop Production

Alison Robertson
July 10, 2017 1:45 PM

Bacterial leaf streak is a new disease of corn that was confirmed in the U.S. last year - as if we don't have enough spots to diagnose on corn!  And, as you might expect, a lot of spots and streaks on corn can be misdiagnosed for bacterial leaf streak.

Over the winter, corn pathologists...

Plant Diseases

Jody Korthaus
July 7, 2017 12:05 PM

Daren Mueller
July 7, 2017 12:05 PM

While scouting corn and soybean fields this summer, farmers and agribusiness professionals are encouraged to tweet a photo with the name of the crop disease, county, and state to either @corndisease or...

Insects and Mites, Plant Diseases, Weeds

Erin Hodgson
July 6, 2017 7:48 AM

A few of you with eagle eyes have been asking about this unique-looking caterpillar feeding in soybean. The green body and dark head capsule definitely make it stand out compared to other green caterpillars. It’s the obliquebanded leafroller (Choristoneura rosaceana), a tortricid moth....

Insects and Mites

Rebecca Vittetoe
June 28, 2017 9:12 PM

Meaghan Anderson
June 28, 2017 9:12 PM

Virgil Schmitt
June 28, 2017 9:12 PM

Farmers, ag retailers, and certified crop advisers gathered at the Southeast Research and Demonstration Farm on June 22 for the research farm association’s annual spring field day.  Myron Rees, farm superintendent, kicked off the field day by sharing a farm and crop update with everyone. Some...

Crop Production

Rebecca Vittetoe
June 27, 2017 4:34 PM

Despite June typically being one of the wettest months of the year, it is ending to be much drier than normal across much of the state. Besides drier conditions, other common issues showing up in Iowa crop fields include weed management concerns, herbicide drift, nutrient deficiencies, and...

Crop Production

Clarke McGrath
June 26, 2017 12:57 PM

We are now past the Summer Solstice, which means daylight hours will be getting shorter and we will starting seeing more flowers on soybean plants in fields, which has triggered questions about when we have to stop using dicamba on Xtend beans.

There isn’t really a true “cutoff date” for...

Crop Production

Bob Hartzler
June 22, 2017 11:04 AM

The introduction and spread of Palmer amaranth in Iowa undoubtedly will have a significant impact on crop production and weed management in the future.  However, since the first infestations were identified I've been intrigued by what seemed odd behavior for a plant with Palmer amaranth's...

Weeds

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