Corn

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NWS-Omaha map showing areas of below normal temperatures

Scout Corn Fields for Kernel Set August 4, 2017

Considering the day to day and week to week variability in weather we’ve experienced and the wide range of regional conditions across Nebraska this year, scouting fields for kernel set and overall condition may be more important than ever. Check out these corn reports from across the state.

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Corn pollen shed

High Humidity and Temperature and Corn Pollination August 4, 2017

Will the high temperatures and humidity experienced in the last few weeks impact corn pollination and kernel set? This summary from an earlier CropWatch article, How Extended High Heat Disrupts Corn Pollination, sheds some light on the question.

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Map of counties where southern rust had been confirmed as of Aug. 3, 2017
Map of counties where southern rust had been confirmed as of Aug. 3, 2017

Nebraska Counties where Southern Rust Has Been Confirmed in Corn August 3, 2017

As of Aug. 3 southern rust had been confirmed in 26 Nebraska counties by the University of Nebraska Plant and Pest Diagnostic Lab. This map is updated as new confirmations are made.

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USDA-NASS: Corn 61% Good-Excellent; Soybean, 60% July 31, 2017

Winter wheat harvest has been completed across most of Nebraska, according to the July 30 report from USDA’s National Agricultural Statistics Service. Significant rainfall of an inch or more was received across most of the state during the previous week and a few north central counties received as much as four inches of rain.

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Twospotted spider mites. Almost microscopic in size, the spider mites may be imperceptible on a leaf, but become more visible against its silk-like webs. (Photo by Jim Kalisch)

Spider Mite Reports Increasing July 28, 2017

Spider mite populations are increasing in Nebraska. Fields should be scouted and the species correctly identified to provide proper management. Population levels should also be considered when treating fields with other insecticides that may knock out all natural predators, leading to population explosions of spider mites.

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Making Silage from Dry Corn July 28, 2017

Most dryland corn fields may be too dry for making the best silage. Dry silage is difficult to pack well enough to force out all the oxygen and it often spoils, lowering its energy and protein digestibility. It also can heat up, leading to spontaneous combustion fires.

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Corn stubble with little residue
Figure 1. After the corn was cut for silage, little plant material remained in this southwest Nebraska field to protect the soil from wind or water erosion or to capture snow moisture. The corn had been planted in a field with little wheat residue.

Should You Hay or Cut Silage from Drought-Damaged Corn Fields July 28, 2017

Drought conditions across much of Nebraska will limit grain yields in dryland corn this year, leading growers to look at other options for harvesting value from these fields. In some cases, harvesting this plant material may contribute to nutrient and water removal from the soil and may not be the best solution for your rotation or cropping system.

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Southern rust pustules on a corn leaf

Corn Disease Update: Southern Rust Increasing; Diplodia New to Nebraska July 27, 2017

Warm, wet conditions across Nebraska the past two weeks created optimal conditions for crop diseases. This update looks at identification and management of three diseases in corn: southern rust, which is expanding in the state, bacterial leaf streak, and diplodia, which is new to Nebraska.

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