Corn

Also see: Corn
Corn nematode damage
Figure 1a. Severe sting nematode injury to corn. When sampling severely affected areas, collect samples from the edges of damaged areas in the field. That's where you'll find the most nematodes. (Photos by Tamra Jackson-Ziems)

Corn Nematodes: Scout Sandy Soils Now, Other Soils Any Time June 7, 2016

This year nematode damage in some Nebraska fields may be masked by the ample rainfall we’ve received, but rest assured, these plant parasitic nematodes are still there in almost every field. Their impact ranges from no obvious sign to severe crop injury and tremendous yield loss.

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Inconsistent corn stand indicating possible seedling disease
Figure 1. Scout corn stands for intermittent gaps indicating missing or lost plants as well as diseased or dead plants.

Seedling Diseases Continue to Develop in Nebraska Corn June 2, 2016

Following several weeks of rainy conditions, seedling diseases are becoming more apparent in corn. See what symptoms to look for when scouting fields.

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Nitrogen cycle
Figure 1. The nitrogen (N) cycle illustrates how complex this nutrient is. There are several ways this essential nutrient for corn production can be lost. (Source: Nebraska Extension guide, Nutrient Management for Agronomic Crops, EC155)

Q&As: How much N is Left? Do I Need More Starter When Replanting? May 27, 2016

Well, it seems not much has changed since the last article I wrote on nitrogen (N) management a few weeks back: more rain, more to come, and more uncertainty with regard to N. So, what do we do now and why I am not worried about the other nutrients? Why is it always about N?

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Corn seedling disease
Figure 1. Stunting, discoloration, damping off, and root rot are all common symptoms of seedling diseases, like the plant on the left compared to the healthy plant (right).

Seedling Diseases Developing in Corn May 20, 2016

With cool wet conditions favorable for corn seedling disease development, growers are urged to scout for inconsistent stands and disease pressure. This week seedling diseases were documented in 10% of surveyed fields in Dodge County in eastern Nebraska, mostly in corn-after-corn fields in river valleys. Be sure to monitor seedling emergence and stand establishment across the state during the coming weeks so that if problems occur they can be detected as early as possible.

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Yellowish corn seedlings
Yellowish corn seedling

Why are Emerged Corn Seedlings Yellow? May 19, 2016

The yellow hue to corn seedlings reported in multiple fields this week may be indicative of several conditions, but is likely due to the cool wet weather plants have experienced since emergence. The symptoms do not necessarily point to a nitrogen or potassium deficiency which may also cause a yellow hue. In addition, corn seedlings subjected to water-saturated soils, soil compaction, and certain herbicide applications may appear yellow.

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Corn leafing out below ground
Corn leafing out below ground

Q and A: Should I Keep My Initial Corn Stand or Replant? May 13, 2016

When deciding whether to replant a less than optimum corn stand, consider current stand, potential yield, and potential yield of replanted crop at this point in the season. The authors guide you through the process of assessing the stand, and next steps, if necessary.

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Hail-damaged corn plants
Hail-damaged corn plants

Hail Damage in Corn May 11, 2016

Yield losses from hail storms will depend on the timing and severity of the hail, and subsequent environmental conditions. Regardless of the level of damage, farmers should be patient when evaluating early-season hail damage in corn and wait 7–10 days after a hail event to allow for crop regrowth. See more on replant decision, yield potential of surviving plants, hail and bacterial plant pathogens.

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Corn leafing out below the surface
Corn seedling leafing out below the soil surface

Planting Delays? It's too Early to Consider Switching Hybrids or Moving to Soybeans May 4, 2016

While corn planting has been delayed in areas of the state due to recent rains, it's too early to consider switching hybrids or switching to soybeans. The author addresses some key points to consider for those waiting to plant and those who planted early and may need to assess stand viability.

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