Bob Harveson - Extension Plant Pathologist, Panhandle Research and Extension Center

Microscopic fungal pathogens
This photo illustrates growth differences of two fungal pathogens and how they are identified from the Disease Index. Characteristic hyphal growth in culture of Aphanymyces cochliodes (right) and Rhizoctonia solani (left) emerging from infected seedlings plated at the same time in the plant pathology lab.

Soil Disease Index, Tool for Managing Sugarbeet Diseases, Available for Growers

December 13, 2021
Since 2003, the UNL Panhandle Research and Extension Center has offered a pre-plant soil test to producers who need to identify soilborne sugarbeet pathogens in fields that will be planted to sugarbeets.

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Ranger alfalfa plants

Additional Gram-positive Bacterial Diseases in Nebraska Crop Production

May 11, 2021
A review of two lesser-known diseases caused by Gram-positive bacterial pathogens that have been observed in Nebraska — bacterial wilt of alfalfa and bacterial mosaic of wheat.

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Sugar beets with root disease
These sugarbeets demonstrate symptoms of a root disease characteristic of the wet-rot disease.

Sugarbeets: Source of the First Gram-Positive Bacterial Disease in Nebraska

March 10, 2021
Nebraska Extension Plant Pathologist Bob Harveson discusses the origins and impact of Gram-positive bacterial pathogens to Nebraska agriculture.

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Diseased chickpea plant
A close-up view of Ascochyta blight in chickpea, showing symptoms on pods and dead leaves.

New Chickpea Disease Study Will Begin in 2021

January 29, 2021
With chickpea demand on the rise, UNL researchers are digging into a fungal disease issue that has long-prevented the crop's commercial growth in Nebraska. 

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Lesions on sugar beet leaves.
Young lesions of the pathogen forming on sugar beet leaves.

Cercospora Leaf Spot Detected in the Panhandle

July 22, 2020
On July 13, symptoms characteristic of Cercospora leaf spot (CLS) were found on lower leaves of sugarbeets from research plots at the Panhandle Research and Extension Center at Scottsbluff.

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Young lesion of Cercospora leaf spot on sugar beet leaf

Specialty Crops Disease Update - 2019

March 19, 2020
The incidence and distribution of crop diseases in western Nebraska have long been known to be influenced based on environmental conditions experienced during that particular year.

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Sample crop production budget for corn

Why Should You Prepare and Use Crop Budgets?

December 4, 2019
The 2020 Crop Production Budgets for Nebraska are now available. They include 80 budgets for 15 crops, available in both PDF and customizable Excel formats.

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A comparison of the bacteria that cause bacterial wilt of dry beans and Goss’ wilt of corn. The rods of Curtobacterium (left) in the dry bean wilt pathogen are shorter and fatter than the Goss’ wilt pathogen, Clavibacter (right).
Figure 1. A comparison of the bacteria that cause bacterial wilt of dry beans and Goss’ wilt of corn. The rods of Curtobacterium (left) in the dry bean wilt pathogen are shorter and fatter than the Goss’ wilt pathogen, Clavibacter (right).

Puzzling Out Two Closely Related Corn, Dry Bean Diseases

October 24, 2019
Two closely related plant diseases — one in corn and the other in dry bean — have followed similar, but somewhat perplexing patterns of appearing, disappearing, and then resurging as a serious threat to crop yield. A UNL researcher looks at factors affecting the cycle and whether it can be predicted.

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