Southern Rust

Tar spot on corn leaf

Black Spots in Corn? Southern Rust, Tar Spot and More

August 29, 2024
Differentiating between corn diseases can be difficult, but it's vital for effective long-term management. Read this article to learn more about the identifiable characteristics of Nebraska's most common and emerging corn diseases.

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Tar spot symptoms on corn leaf

Corn Disease Update: Fungicide Expectations for Disease Control

August 15, 2024
Persistent wet weather in the early growing season set the scene for corn diseases to flourish. This article provides guidance on using foliar fungicides to mitigate loss, regarding application timing, disease history, crop stage and weather impacts. 

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This Week on N Field: Southern Rust 2024

August 2, 2024
UNL Extension Specialist Tamra Jackson-Ziems discusses concerns about the early onset of southern rust in Nebraska this year.

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Extension educator county map

Extension Crop and Pest Reports (July 22-26)

July 26, 2024
Extension educators share their observations in fields across Nebraska this week.

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Southern rust spots on corn leaf

Southern Rust Spreading in Eastern Nebraska

July 25, 2024
Southern rust development and presence in several eastern Nebraska counties was earlier and more widespread this year. Producers are encouraged to scout their fields, and send samples to UNL for assistance with identification.

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Closeup of black spots on corn leaf
Figure 1. Tar spot black stromata develop on the upper leaf first then become visible underneath too. Over time, the spots increase in size and elongate. (Photos by Tamra Jackson-Ziems)

Corn Diseases Developing in Some Fields — What To Watch

July 12, 2024
Tar spot has been confirmed in several eastern Nebraska counties in recent weeks, and distribution of the fungus is expected to continue expansion this year.

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Frogeye leaf spot

Corn and Soybean Disease Update: Southern Rust, Frogeye Leaf Spot, and Phytophthora Root and Stem Rot

July 21, 2021
Following identification of southern rust, Phytophthora root and stem rot, and frogeye leaf spot in areas throughout the state, producers are encouraged to scout and be prepared to apply the appropriate fungicide treatments.

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map showing southern rust in 45 Nebraska counties

Crop Diseases Spreading and Increasing

August 6, 2020
Southern rust continues to spread across eastern Nebraska. To date, southern rust has been reported in 45 Nebraska counties. Gray Leaf Spot, Bacterial Leaf Streak and Frogeye Leaf Spot are increasing as well.

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