Disease Reports from the UNL Diagnostic Clinic – July 31

Disease Reports from the UNL Diagnostic Clinic – July 31

The following diseases were reported in samples submitted to the UNL Plant and Pest Diagnostic Clinic from July 15 through July 30, 2020.

Soybean

Central District – Phytophthora Root and Stem Rot, Frogeye Leaf Spot, Phyllosticta Leaf Spot, Bacterial Blight

East District – Phytophthora Root and Stem Rot

North Central District – Phytophthora Root and Stem Rot, Frogeye Leaf Spot

Southeast District – Phytophthora Root and Stem Rot, Frogeye Leaf Spot, Phyllosticta Leaf Spot, Bacterial Blight

South Central District – Phytophthora Root and Stem Rot, Frogeye Leaf Spot, Bacterial Blight, Bacterial Pustule

Corn

Central District – Common Rust, Southern Rust, Gray Leaf Spot, Bacterial Leaf Streak, Physoderma Brown Spot, Northern Corn Leaf Blight

East District – Common Rust, Southern Rust, Gray Leaf Spot, Bacterial Leaf Streak, Northern Corn Leaf Blight

Northeast District –Gray Leaf Spot, Bacterial Leaf Streak, Northern Corn Leaf Blight

North Central District –Gray Leaf Spot, Bacterial Leaf Streak

South Central District – Common Rust, Southern Rust, Gray Leaf Spot, Bacterial Leaf Streak, Physoderma Brown Spot, Northern Corn Leaf Blight, Anthracnose Leaf Blight

Southeast District – Common Rust, Southern Rust, Gray Leaf Spot, Bacterial Leaf Streak, Northern Corn Leaf Blight

Resources

Find more information and photos about each of these diseases in the Crop Disease Management section of CropWatch for Wheat, Soybean, and Corn. If you'd like to submit a sample to the clinic for diagnosis, check out this CW story, Quality Samples Lead to Better Diagnosis, for tips on packaging and sending samples.

Visit the Plant and Pest Diagnostic Clinic page in CropWatch for

  • information on how to submit crop and pest samples,
  • a sample submission form, and
  • a fee schedule for diagnostic services.
Map of Nebraska crop reporting districts
Figure 1. Reporting districts
Southern Rust on top of Gray Leaf Spot Lesions on a sample from Lancaster County
Photo 1. Southern Rust on top of Gray Leaf Spot Lesions on a sample from Lancaster County.
Baseball bat-shaped spores of Cercospora zea-maydis, fungal pathogen that causes of Gray Leaf Spot intermixed with teardrop-shaped spores of Puccinia polysora, fungal pathogen that causes Southern Rust of corn.
Photo 2. Baseball bat-shaped spores of Cercospora zea-maydis, fungal pathogen that causes of Gray Leaf Spot intermixed with teardrop-shaped spores of Puccinia polysora, fungal pathogen that causes Southern Rust of corn. Pictures taken at 400x magnification.