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
As southern rust development slowed in some areas with recent cooler temperatures, gray leaf spot severity is now increasing and moving up corn plants to critical leaves for grain fill. Fungicides may be warranted for some GLS.
Southern rust has now been confirmed in corn in 26 Nebraska counties. As we confirm more Nebraska counties with southern rust, it's important to know that the vast majority of rust reports have been sparse and no fungicide application was required. Continued scouting is urged, as injury can be critical to the grain-fill through dough stages.
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.