Corn

Also see: Corn
Map of sites for corn yield forecasts for 2016
Map of sites for corn yield forecasts for 2016

2016 Corn Yield Forecasts: Approach and Interpretation of Results June 30, 2016

The Yield Forecasting Center will be providing in-season corn yield forecasts every two weeks starting in mid-July to aid growers and the ag industry in making management, logistics, and marketing decisions through the season. The Center consists of a core team at UNL in collaboration with agronomists and extension educators from universities throughout the Corn Belt.

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western bean cutworm
western bean cutworm

Using Degree-Days to Predict Western Bean Cutworm Flights June 24, 2016

Accumulated degree-days offer a proven means for estimating when to scout for insects, including the western bean cutworm. Here's how to estimate insect growth and recommended dates to start scouting for WBC at 14 Nebraska sites.

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Corn leaf rolling
Figure 1. One indicator of heat stress is when corn leaves roll in the early morning in areas where there is adequate soil moisture.

Impacts of Extreme Heat Stress and Increased Soil Temperature on Plant Growth and Development June 21, 2016

Both corn and soybean are susceptible to extreme heat (and water) stress during early vegetative stages as well as later critical growth stages (pollination for corn and flowering for soybean). Extreme heat stress can reduce plant photosynthetic and transpiration efficiencies and negatively impact plant root development, which collectively can negatively impact yield. The author recommends that during an extended heat wave (air temperature equal to or greater than 90 F for 7-10 days), applying 0.25-0.40 inch of water can be very beneficial.

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Nitrogen Rescue Treatments in Corn June 17, 2016

When corn is yellow and struggling to get nitrogen, a rescue treatment may be advisable. Research in neighboring states found a rescue treatment could increase yields by an average 34 bu/ac.

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First Generation European Corn Borer Scouting & Treatment June 14, 2016

Growers are noting shot-hole feeding from European corn borer in non-Bt corn. Nebraska Extension offers several resources to monitor moth activity and determine when treatment is necessary.

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Patricio Grassini and a field of corn
Patricio Grassini and a field of corn

UNL Corn Yield Model Verifies as Reliable Larger Scale Predictor June 13, 2016

Collecting basic agricultural data from a mere 45 sites can provide enough predictive power to reasonably estimate crop yields within a 10-state swath of the U.S. Corn Belt, says a new study led by the University of Nebraska-Lincoln. The study compared actual corn production from 2011 through 2014 against best-case projections from the UNL Hybrid-Maize model that accounts for weather, soil properties and planting practices.

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Map showing accumulated DD indicating scouting window for common stalk borer

Predicting Stalk Borer Development in Corn June 13, 2016

Based on accumulated degree days, scouting should be underway across the state for common stalk borer in corn.

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Corn plant damaged by wheat stem maggot
Corn plant damaged by wheat stem maggot

Wheat Stem Maggot Damaging Corn after Rye June 9, 2016

UNL has been tracking an unusual insect pest the past couple of years in northeast Nebraska that may be a potential concern to farmers growing corn after rye or other grass cover crops. A number of producers and crop scouts have reported stunted corn plants at V1 to V2 with brown flagging in their fields due to the wheat stem maggot (WSM), a species of Chloropid fly. These are small flies that are typically about 1/8 inch long with black and yellow markings. The wheat stem maggot overwinters in the stem of its host plants as a larva and emerges in May to begin feeding.

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