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Yellow, stunted corn ... more than one possible cause

Areas of light green to yellow, often stunted, corn plants are visible in many corn fields throughout the state at this point in mid-June. There is no single cause for such crappy looking corn (Nielsen, 2012) and multiple causes may occur in the same field, which makes for challenging diagnoses and frustrating discussions with the grower.

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Crop-rotation resistant rootworms have a lot going on in their guts

After decades of effort, scientists are finally figuring out how insects develop resistance to environmentally friendly farming practices – such as crop rotation – that are designed to kill them. The researchers say their insights will help develop more sustainable agricultural practices.

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How to identify emergence issues in corn

With much of Ohio corn now planted statewide, growers who can identify any emergence problem early on will likely have a better chance of coming up with a successful solution to the issue, said an agronomist in the College of Food, Agricultural, and Environmental Sciences at The Ohio State University.

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Troubleshooting early season corn insect damage

Troubleshooting early season corn insect damage can be difficult. There are several potential insect pests and some cause similar symptoms. Also, there is the possibility that if environmental and field conditions match up, new or unexpected insect damage may occur. Getting a complete “picture” of the situation will improve your diagnosis or provide more answers to questions if you seek outside help. Sometimes the answers is obvious. Other times, your diagnosis may be complete when several, but not all, clues point to one (or more?) insect.
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True armyworms defoliating corn seedlings

The true armyworm is a migratory pest from the southern U.S. that feeds on the leaf tissue of early and late vegetative corn. Adult true armyworm moths are attracted to fields that contain living ground cover, which include fields with grassy weeds or cover crops such as rye or grass.

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Check for wireworm injury when assessing corn stands

Last week, (May 19-22, 2015), some wireworm activity was noted in south-central Iowa. Ideally, scouting for wireworms should occur prior to planting because there are no effective rescue treatments. However, most people don’t see the impact this pest can have on a corn stand until corn plants emerge.

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Is the Bt trait less effective for corn earworms?

A new study from North Carolina State University and Clemson University finds that the toxin in a widely used genetically modified (GM) crop is having little impact on the crop pest called corn earworm (Helicoverpa zea) – which is consistent with predictions made almost 20 years ago that had been largely ignored.

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Black cutworm scouting 2015

The black cutworm (BCW) is a migratory pest that cuts corn seedlings and feeds on leaf tissue. Scouting for BCW larvae helps to determine if an insecticide application will be cost effective. When to scout for BCW caterpillars is based on the peak flight of moths and accumulating degree days after the peak flight.

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