Corn Disease

Diplodia fungus on a corn ear

Ear Rot Diseases Developing in Some Nebraska Corn Fields September 29, 2017

Common ear rot diseases are beginning to develop in corn fields and growers are encouraged to scout fields prior to harvest to aid in management decisions. Harvest and storage conditions can impact whether grain molds will continue to worsen.

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Bacterial leaf streak in corn
Figure 1. Bacterial leaf streak symptoms on corn are interveinal streaks that may appear tan, brown, or especially yellow when backlit by the sun.

Bacterial Leaf Streak of Corn August 25, 2017

Bacterial leaf streak was just confirmed in Nebraska in 2016, the first incidence in the US, but has now spread to 56 counties and is found in eight other states.Learn about factors contributing to its development and "host" plants, as well as management options.

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Counties with confirmed southern rust

Continued Scouting Urged for Southern Rust Now in 26 Counties August 4, 2017

Southern rust has now been confirmed in corn in 26 Nebraska counties. As we confirm more Nebraska counties with southern rust, it's important to know that the vast majority of rust reports have been sparse and no fungicide application was required. Continued scouting is urged, as injury can be critical to the grain-fill through dough stages.

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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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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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Southern rust on a corn leaf
Figure 1. Southern rust has been confirmed in corn in eight eastern Nebraska counties and growers are urged to scout from now through August, as weather conditions are quite favorable for its development.

Southern Rust Confirmed in Corn in 8 Eastern Nebraska Counties July 19, 2017

Southern rust has been confirmed in corn in 8 eastern Nebraska counties and growers are urged to scout vigilantly to schedule optimal timing of treatment, if needed. Most systemic fungicides can provide protection of leaves from future infections for 21-28 days.

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common corn smut on an ear

Several Corn Diseases Developing Across Nebraska July 13, 2017

Several diseases, as well as other problems that look like diseases, have been confirmed in corn samples from around the state. These diseases can be difficult to differentiate from each other and from abiotic causes. This story offers photos and brief descriptions to aid your diagnosis before making treatment decisions.

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Bacterial leaf streak lesions may vary in color and length, but will be between veins and often have wavy margins. (UNL Photos)

Detection and Characterization of the Causal Agent for Bacterial Leaf Streak in Corn July 7, 2017

When a new crop disease strikes, researchers dig in to identify its characteristics. Noting how it's similar to and different from other diseases are part of defining it so plant pathologists can better confirm its presence in the field, monitor its spread, and develop appropriate management practices. Here's the story of how plant pathologists identified bacterial leaf streak.

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