Crop Diseases Confirmed By Plant & Pest Lab June 15-27

Jul 03, 2017
 
University of Nebraska-Lincoln
Institute of Agriculture and Natural Resources
CROPWATCH
 
Crop Diseases Confirmed By Plant & Pest Lab June 15-27
Figure 1. (left) Typical symptoms of Holcus spot caused by Pseudomonas syringae pv syringae: light tan to white round spots that look similar to minor damage from herbicide drift from cell membrane disruptors, such as gramoxone (like Paraquat). (right) More severe symptoms of Holcus spot. It is important to not mistake this disease for a fungal leaf disease as fungicides will not be effective against this bacterial pathogen.
 
The following diseases were reported in samples submitted to the UNL Plant and Pest Diagnostic Lab June 15 to June 27.
 
Wheat
 
East District – Septoria leaf spot, leaf rust, stripe rust, bacterial stripe/black chaff
 
Southwest District – Wheat streak mosaic virus, Septoria leaf spot, leaf rust, bacterial stripe/black chaff
 
Northwest District – Wheat streak mosaic virus, Septoria leaf spot, leaf rust
 
Crop Diseases Confirmed By Plant & Pest Lab June 15-27
Figure 1. Reporting districts
 
Soybean
 
East District – Pythium damping off
 
Southeast District – Rhizoctonia damping off
 
Central District – Rhizoctonia damping off
 
Corn
 
Southwest District – Holcus spot
 
East District – Pythium damping off
 
Southeast District – Rhizoctonia damping off, Holcus spot
 
Central District – Fusarium crown and stem rot damping off
 
South District – Fusarium crown and stem rot, Bacterial leaf streak, common rust, Holcus spot
 
Hops
 
East District – Downy mildew