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

Bob Harveson

(faculty)
Work
4502 Ave I Scottsbluff NE 69361-4939
US

Faculty Bio

Sunflower Rust
Figure 1. Cinnamon-colored uredial pustules (left) and dark, black telial pustules (right). These are the overwintering structures of rust. (Photos by Bob Harveson)

Sunflower Rust May be Problematic in 2018 — Be Aware! May 24, 2018

Unusually early findings of rust in volunteer sunflower in western Nebraska indicate the potential for a major outbreak much earlier than usual. Growers are encouraged to scout within the first few weeks of emergence and treat where necessary.

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Dry rot canker in sugarbeet
Figure 1. Surface tissues of the dry rot canker rhizoctonia disease first identified in sugarbeet in 1920 are marked by a distinctive series of concentric circles. (Photos by Bob Harveson)

Dry Rot Canker – Obscure, but Returning Rhizoctonia Disease May 23, 2018

Dry rot canker, one of several rhizoctonia diseaes of sugarbeet, has been relatively obscure since first being identified almost a century ago. New technologies, however, have helped to differentiate it from the more common Rhizoctonia root and crown rot disease.

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Sugarbeet replanting field trial

When To Replant Sugarbeets: The Relationship Between Population, Yield, And Replant Timing May 8, 2018

Early season stand loss from wind or frost can be severe enough to require replanting of a sugarbeet crop. Three years of field trials at the Panhandle Research and Extension Center were conducted to determine just how much stands need to be reduced to justify replanting.

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Fungicides are for Fungi April 24, 2018

Management of foliar fungal disease is achieved in many of our field crops by applying fungicides. Over the past several years, there have been examples of misidentification of some bacterial diseases that are easily confused for fungal diseases in field crops.

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A typical wheat field in Nebraska early in the growing season.
Figure 1. A typical wheat field in Nebraska early in the growing season.

It's Time to Scout for Wheat Diseases April 19, 2018

With the predicted return to more normal temperatures, it's time to get into wheat fields and start scouting. Stripe rust has already been reported in southeastern Kansas and is expected to move northward. Included is a table of fungicide efficacy ratings for disease management in wheat.

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Violet root rot, a rhizoctonia crocorum fungus, in soil

The First Identified Root Pathogen: Rhizoctonia April 12, 2018

This is the second article in a series on distinct sugar beet root rot diseases caused by the genus Rhizoctonia. This week Rhizoctonia solani and Rhizoctonia solani are featured.

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Figure 1. Complete and permanent collapse of sugarbeet petioles and leaves caused by Rhizoctonia Root and Crown Rot.
Figure 1. Complete and permanent collapse of sugarbeet petioles and leaves caused by Rhizoctonia Root and Crown Rot.

Exploring the Rhizoctonia Pathogens of Sugarbeet February 16, 2018

This is the first article in a series on distinct sugarbeet root rot diseases caused by the genus Rhizoctonia.

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Figure 1. Wilting symptoms in seedling sugar beet caused by Rhizoctonia root and crown rot. Soil testing and using a disease index developed at the university's Panhandle Research and Extension Center can help identify high risk fields before planting. (Photos by Bob Harveson)

Creating a Soil Disease Index for Nebraska Sugar Beet December 13, 2017

Soil testing and a disease index developed at the university's Panhandle Research and Extension Center can help growers identify rhizoctonia risk levels of fields before they're planted to sugar beets.

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