Tamra Jackson-Ziems, Extension Specialist and Associate 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
Warm, wet conditions across Nebraska the past two weeks created optimal conditions for crop diseases. This update looks at identification and management of three diseases in corn: southern rust, which is expanding in the state, bacterial leaf streak, and diplodia, which is new to Nebraska.
Southern rust has been confirmed in corn in 8 eastern Nebraska counties and growers are urged to scout vigilantly to schedule optimal timing of treatment, if needed. Most systemic fungicides can provide protection of leaves from future infections for 21-28 days.
Several diseases, as well as other problems that look like diseases, have been confirmed in corn samples from around the state. These diseases can be difficult to differentiate from each other and from abiotic causes. This story offers photos and brief descriptions to aid your diagnosis before making treatment decisions.
Bacterial leaf streak disease has been confirmed on a sample submitted to the UNL Plant and Pest Diagnostic Clinic from Adams County. The corn was at the V4 growth stage and represents the earliest that the disease has been confirmed in a field.
Recent cold, wet field conditions and fluctuations in soil temperatures have put early planted corn at risk for seedling disease development. Cold soil temperatures and episodes of recent rainfall (and snow) are especially favorable for some of the most common and damaging seedling diseases favored by cold wet conditions.
Bacterial leaf streak was first confirmed in the US in August 2016 when it was identified in Nebraska corn. It has now been confirmed in 51 Nebraska counties and found in corn fields across the Midwest. This article offers information on current status, identification, and management of the disease. Resistance is not currently available in hybrids and standard management measures of bacterial diseases will help mitigate but not eliminate damage.
A review of 2016 growing conditions across Nebraska sheds light on a number of factors that may have contributed to reduced yield in individual fields. An understanding of these factors may be helpful when selecting seed for 2017.