Blog

Alison Robertson
September 18, 2017 2:30 PM

Jody Korthaus
September 18, 2017 2:30 PM

To help farmers and agronomists identify, scout, and manage corn diseases a new Corn Diseases booklet, published by Iowa State University Extension and Outreach, is now available to crop producers and industry professionals. The up-...

Plant Diseases

Bob Hartzler
September 18, 2017 11:59 AM

My colleagues at Purdue recently compiled weather data to determine how many hours would be available to apply the new dicamba products (e.g. Xtendimax with VaporGrip Technology, FeXapan with VaporGrip Technology, and Engenia...

Weeds

Mark Hanna
September 14, 2017 12:31 PM

Clarke McGrath
September 14, 2017 12:31 PM

It’s always difficult to forecast weather, but if dry field conditions persist, potential for combine and field fires this fall could be a problem. All it takes is a single high-temperature source in the engine area, or an overheated bearing to ignite dry plant material.

During harvest...

Crop Production

Rebecca Vittetoe
September 13, 2017 9:19 PM

As the 2017 growing season winds down, ISU Extension and Outreach field agronomists share how the crops are progressing and finishing out the season in their repressive regions across the state.   

Northwest Iowa

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Crop Production

Erin Hodgson
September 12, 2017 10:28 AM

In mid-August of this summer, I wasn’t hearing anything about aphids feeding on corn and I thought we weren’t going to see it this year. These aphids are highly erratic and so where and when they land are not well understood. But the last week of August, I started to hear from folks in northern...

Crop Production, Insects and Mites

Bob Hartzler
September 5, 2017 10:56 AM

For the past four years (maybe five) I’ve visited the first three known infestations of Palmer amaranth in western Iowa to track the status of the populations in these fields.  Following is a brief summary of  my visits to Harrison, Fremont and Page Counties on September 3.

Weeds

Erin Hodgson
August 28, 2017 11:50 AM

I’m getting a lot of questions regarding treatment timing for soybean aphid. Mainly, when is it too late to treat? In the last week of August 2017, most fields are reaching R5/R6 and so the question is an important one. In my soybean aphid efficacy evaluation, I have sprayed at different plant...

Crop Production, Insects and Mites

Erin Hodgson
August 28, 2017 11:47 AM

The economic threshold of 250 soybean aphids per plant, with more than 80% of plants infested and aphid populations increasing was published in 2007 to prevent populations from reaching the EIL. These values were determined by closely monitoring aphid populations in research...

Crop Production, Insects and Mites

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.

Northwest...

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

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.

...

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

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