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

Bob Harveson

Faculty Bio
Harveson Receives APS Distinguished Service Award from North Central Region
UNL Plant Pathologist's Book Offers Tales of Scientific Discovery

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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Fungicides are for Fungi

January 8, 2018
Symptoms of bacterial diseases can be easily confused with those of fungal diseases in field crops. This article, from the Proceedings of the 2018 Nebraska Extension Crop Production Clinics, reviews some of the common mistakes made in the major field crops and reviews research on the impact of fungicide use after hail events in corn and soybean.

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Sugarbeet replanting field trial

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

January 8, 2018
An article from the Proceedings of the 2018 Nebraska Extension Crop Production Clinics: 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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Specialty Crops Disease Update – 2018

January 8, 2018
Rainfall in spring and early summer 2017 was plentiful throughout western Nebraska, allowing good soil moisture for emerging crops, but also contributing to the development of plant diseases in multiple crops. This is an article from the Proceedings of the 2018 Nebraska Extension Crop Production Clinics.

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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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Wheat field with stripe rust
Figure 1. Stripe rust in a grower's winter wheat field in Kimball County in June 2015. Taking steps now before planting can help reduce disease impact for your 2018 crop. (Photo by Stephen Wegulo)

5 Pre-Planting Steps to Reduce Disease Problems in Wheat

August 28, 2017
Before planting winter wheat this fall growers have an opportunity to address and manage several factors that could lead to reduced yields in 2018. Here are five steps to take.

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