Tamra Jackson-Ziems - Extension Plant Pathologist

Tamra Jackson-Ziems

Work Plant Sciences Hall (PLSH) 406
Lincoln NE 68583-0722
Work 402-472-2559 On campus, dial 2-2559
Tamra Jackson-Ziems, Extension Specialist and Professor, joined the faculty of the Department of Plant Pathology at the University of Nebraska-Lincoln (UNL) in April 2005 after completing her graduate degrees at the University of Arkansas and University of Illinois-Urbana. Her appointment is split between extension, research, and teaching 80/10/10%, respectively, with statewide responsibility for diseases of corn and grain sorghum. Her extension activities encompass educating clientele about disease identification, prevention, and management. And her research projects encompass a broad range of topics, including bacterial leaf streak, Goss’s bacterial wilt and blight, use of fungicides for disease control, and plant parasitic nematodes of corn. During her time at UNL, she has delivered more than 180 invited presentations in 16 states and is the 2016 recipient of both the Nebraska Cooperative Extension Association’s Award for Outstanding Creative Programming (for an individual) and the Nebraska Ag Business Association’s Education and Research Person of 2016 Award.


  • Ph D, University of Illinois-Urbana, 2005
  • MS, University of Arkansas, 2000
  • BS, University of Central Arkansas, 1996

icon-bookmark-starAwards & Honors

  • Outstanding Education and Research Person of 2016, Nebraska Ag Business Association, 2016
  • Outstanding Award For Creative Programming (Individual) for "Bacterial Leaf Streak of Corn", Nebraska Cooperative Extension Association, 2016
  • Dinsdale Family Faculty Award, IANR, 2009
  • Distinguished New Extension Employee Award , UNL Extension, 2009

Faculty Bio

Twitter: @tjcksn
YouTube: Corn Disease Videos at UNL CropWatch
Website: Corn Disease section of CropWatch Plant Disease Management

Aspergillus ear rot damage in corn
Aspergillus ear rot damage in corn

Ear and Stalk Rot Diseases Becoming More Common in Corn Fields

October 13, 2016
Ear rot diseases have been observed and stalk rot diseases are becoming increasingly common. It’s important to scout for stalk rot diseases now to determine which fields are at greatest risk of lodging and should be harvested first. Although it is unknown if ear rot diseases are widespread, it’s also important to scout for ear rot diseases to know how to better handle affected grain at harvest to prevent or minimize impacts on grain quality.

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The tops of corn plants that have Anthracnose stalk rot top dieback may break off prior to harvest, but are not always an indicator of stalk and crown rot lower on the plant.
The tops of corn plants that have Anthracnose stalk rot top dieback may break off prior to harvest, but are not always an indicator of stalk and crown rot lower on the plant.

Scouting for Stalk and Ear Rot Diseases

September 29, 2016
Stalk rot diseases are increasing in corn, causing top die-back in a number of fields, and ear rot diseases are developing in some fields. Scout fields now to help determine the need for any adjustments in your harvest management.

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Crown rot in corn
Crown rot in corn

Stalk Rot Diseases Including Anthracnose Top Dieback Developing in Some Fields

September 9, 2016
While most of the Nebraska corn crop looks good, there is early evidence of developing stalk and crown rot diseases, including Anthracnose top dieback. Producers are encouraged to scout their fields for disease and prioritize those fields for harvest where lodging may become an issue.

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Bacterial Leaf Streak of Corn
Bacterial Leaf Streak of Corn

Bacterial Leaf Streak of Corn Confirmed in Nebraska, Other Corn Belt States

August 26, 2016
Bacterial leaf streak disease of corn, caused by Xanthomonas vasicola pv. vasculorum, has now been confirmed in multiple Corn Belt states. First identified in Nebraska, the bacterial disease has symptoms similar to other corn diseases, such as gray leaf spot, but is managed differently.

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Malformed corn ears
Malformed corn ears

Corn Ear Formation Issues Likely Correlated With the Loss of the Primary Ear Node

August 19, 2016
UNL agronomists and educators responding to grower questions surveyed a number of corn fields this week and found a range of corn ear issues: short husks, dumbbell-shaped ears, and multiple ears per node. The article describes and discusses the situation, potential stress agents, and the development of corn. It also encourages growers to check their fields pre-harvest to better assess causes of potential yield loss.

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Southern rust on a corn leaf
Southern rust on a corn leaf

Corn Disease Update: Southern Rust Confirmed in 10 Nebraska Counties

July 29, 2016
Southern rust has been confirmed in samples from 10 Nebraska counties — Adams, Butler, Clay, Fillmore, Lancaster, Nuckolls, Pierce, Polk, Thayer, and Valley. All were from fields with a low incidence of disease at the time. Growers should also be scouting for rust as well as gray leaf spot, common rust, and physoderma brown spot.

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Corn Disease Updates Aug. 4-5; Samples Welcomed

July 28, 2016

Corn Disease Updates, hosted by Nebraska Extension and sponsored by the Nebraska Corn Board, will be held at three more sites in the next two weeks.

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Corn nematode damage
Figure 1a. Severe sting nematode injury to corn. When sampling severely affected areas, collect samples from the edges of damaged areas in the field. That's where you'll find the most nematodes. (Photos by Tamra Jackson-Ziems)

Corn Nematodes: Scout Sandy Soils Now, Other Soils Any Time

June 7, 2016

This year nematode damage in some Nebraska fields may be masked by the ample rainfall we’ve received, but rest assured, these plant parasitic nematodes are still there in almost every field. Their impact ranges from no obvious sign to severe crop injury and tremendous yield loss.

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