Blog

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.

...

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.

2)...

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

Bob Hartzler
June 21, 2017 12:33 PM

The six weedy Amaranthus species at the weed garden have grown quite a bit, but I'm not sure how much easier it is to differentiate a few of the species. The six pigweeds are Palmer, Powell's and spiny amaranth, waterhemp, and redroot and tumble pigweed (not in that order!!). The...

Weeds

Erin Hodgson
June 21, 2017 9:47 AM

Today while scouting a commercial field north of Ames, I was looking for soybean aphid. I didn't see one aphid (sniff, sniff), but I did see a handful of thistle caterpillars. The caterpillars web together soybean leaves and feed inside the temporary home. They also produce copious amounts of...

Crop Production, Insects and Mites

Rebecca Vittetoe
June 20, 2017 4:46 PM

Some much needed rain fell across parts of the state last week, but with the rain came some strong winds and hail in parts of the state. Other areas could still use some rain. Iowa State...

Crop Production

Paul Kassel
June 20, 2017 10:42 AM

Consider attending one of the Nitrogen and Water Week field days next week – June 27 to 29.

Our focus of these meetings is to have attendees ‘kick the tires’ on the tile drainage studies conducted by Iowa State University. 

Nitrate in tile drainage water is on the mind of many...

Crop Production

Mark Licht
June 19, 2017 8:11 AM

Unfortunately, hail damage is not a rare occurrence in Iowa. Every year hail damage occurs; it is just a matter of how severe it is and how widespread it is. In most cases, hail damage results in varied levels of defoliation. Defoliation will have an impact on crop yield potential at a greater...

Crop Production

Jody Korthaus
June 15, 2017 2:07 PM

The Field Extension Education Lab has five clinics/workshops this summer in July and August. Below is a list of programming updates that correlate with current farmer concerns and this year’s crop issues:

  • New to the lineup this...
Crop Production, Insects and Mites, Plant Diseases, Soils, Weeds, Herbicide Resistance

Rebecca Vittetoe
June 13, 2017 10:33 PM

The USDA Weekly Crop Progress Report showed that Iowa's corn crop is 96% emerged and gave Iowa’s corn crops a 77% good to excellent rating. Soybean...

Crop Production

Bob Hartzler
June 13, 2017 7:55 AM

This year at the ISU FEEL weed garden I've established a plot with nine weedy members of the Amaranthaceae family, including six pigweeds .  The pigweeds were transplanted on June 9 and pictures taken on June 11. Species include redroot pigweed, tumble pigweed, Palmer amaranth, spiny amaranth,...

Weeds

Bob Hartzler
June 8, 2017 2:19 PM

While searching for Palmer amaranth in a pollinator habitat planting I encountered a few musk thistles.  As I always do when I see this weed, I examined flower heads for the presence of the musk thistle weevil.  This insect was imported to North America as a biocontrol agent for musk thistle.  ...

Weeds

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