Blog

Paul Kassel
July 31, 2015 12:12 PM

Waterhemp continues to be a problem in parts of northwest Iowa.  There is a fair amount of waterhemp that survived the glyphosate and/or Flexstar applications in late June. 

There is also a new crop of waterhemp that has germinated recently.   That fact is surprising since it has been...

Herbicide Resistance

Bob Hartzler
July 30, 2015 9:01 AM

Proper selection of adjuvants is essential for effective weed control with herbicides.  Unlike herbicides, adjuvants are not regulated - thus anything can be marketed for this purpose and manufacturers are not required to describe the active ingredients.  This leads to the introduction of ...

Weeds

Bob Hartzler
July 28, 2015 8:40 AM

Meaghan Anderson
July 28, 2015 8:40 AM

Most agronomists are aware of the movement of Palmer amaranth into Iowa.  Although known Iowa infestations are limited to five counties (Harrison, Fremont, Page, Lee and Muscatine) we are confident that it is present in many more counties.  We are pleased by the number of people who have...

Weeds

Bob Hartzler
July 27, 2015 4:14 PM

Teasel

Fig. 1.  Cutleaf teasel seedheads.

Weeds

Paul Kassel
July 24, 2015 3:17 PM

Parts of northwest Iowa are listed as ‘abnormally dry’ on the most recent edition of the Drought Monitor. I would agree with that – we are seeing some effects of dry weather this week.

Corn and soybean crops are wilting in the afternoon on some of the light soil areas.  We have a...

Crop Production

Erin Hodgson
July 21, 2015 11:40 AM

Now that corn silks are out all over Iowa, many people scouting fields will notice a mixture of silk-feeding insects (e.g., corn rootworm, Japanese beetle, grasshoppers, etc.). Sometimes I get asked about how long corn rootworm will emerge. It all comes down to temperature. Like all insects,...

Crop Production, Insects and Mites

Sotirios Archontoulis
July 20, 2015 9:54 AM

Summer is upon us with warmer temperatures, corn pollination underway, and corn grain fill beginning. That also means talk about estimating corn yields come fall. I’m involved in two yield forecasting projects. One is out of ISU and is led by Dr. Sotirios Archontoulis using the APSIM crop model...

Crop Production

Paul Kassel
July 19, 2015 2:07 PM

soybean aphid in hancock county

I am seeing some really good crop development progress in my area.   Most of the corn is tasseled out.  I am thinking...

Crop Production

Erin Hodgson
July 16, 2015 9:43 AM

Yesterday during my class at FEEL, I asked participants to go out in the corn and soybean plots and find pests. It didn’t take too long to find a few plants loaded with soybean aphid. It was the largest natural colonies I have seen this summer (potentially exciting for my research but not great...

Insects and Mites

Erin Hodgson
July 15, 2015 2:37 PM

In case you want to try something a little different, you may be interested in listening to a podcast about field crop pest management. If you are new to podcasting, it is basically an audio file. Some people listen to podcasts on their computer/smart device, in their vehicles while traveling,...

Crop Production, Insects and Mites

I have just got back from the ISU Southeast Research Farm near Crawfordsville.  I was assessing my Cardinal fungicide trial.  With all the reports of northern corn leaf blight (NCLB) in SE IA I decided it was probably worth the drive to get some "disease at VT" data. 

The crop in the...

Plant Diseases

Erin Hodgson
July 14, 2015 1:46 PM

Every summer since 2001, Iowa farmers have to think about soybean aphid. Well, I hope you are thinking about our primary soybean insect pest! 

Aphids have been detected throughout the northern counties this year, and some are asking if it will be a "bad" aphid year. I have to say it's too...

Crop Production, Insects and Mites

Erin Hodgson
July 13, 2015 12:23 PM

Last summer, I posted an ICM News article about how scouting for alfalfa weevils in southern Iowa. It doesn't take too many accumulated degree days for them to start moving around and laying eggs. If you grow or scout...

Crop Production, Insects and Mites

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