Plant Disease

SCN Sample graphic

Improving Soybean Profitability: SCN March 3, 2017

The easiest and least expensive way to improve profitability for many soybean growers in tight economic times, or any time, is to sample fields for soybean cyst nematodes (SCN). In Nebraska trials growers realized an average six-bushel-per-acre soybean yield increase after taking no-cost steps to manage SCN.

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Soybean roots with smaller soybean cyst nematode (SCN) cysts (red arrows) and larger nitrogen nodules (blue arrows).
Soybean roots with smaller soybean cyst nematode (SCN) cysts (red arrows) and larger nitrogen nodules (blue arrows).

SCN Scouting Recommendation Changes; SCN Resistance Possible July 8, 2016

Mid-summer is an effective time to scout for soybean cyst nematode (SCN) using either the visual or soil test method. This story describes both methods. If SCN is identified, a follow-up soil test approximately six years later can help assess effectiveness of treatment efforts as well as identify SCN resistance.

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Soybean seedling damage
Soybean seedling damage

Herbicide Injury and Pathogen Infection on Soybean Seedlings June 17, 2016

In an ongoing survey for soilborne pathogens in soybeans, closer examination of soybean seedling injury in a Keith County field found several causes, including herbicide injury and damping off from Fusarium or Rhizoctonia root rot.

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Reporting districts
Reporting districts

UNL Plant and Pest Diagnostic Clinic June 15 Update June 15, 2016

The UNL Plant and Pest Diagnostic Clinic lists the diseases they've found in the past two weeks in corn, soybean and wheat samples submitted from various districts in Nebraska.

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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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Wheat stripe rust
Figure 1. A flag leaf completely covered with stripe rust in a grower’s field in Nuckolls County on May 25.

Stripe Rust Increasing; Spray Your Wheat to Protect the Flag Leaf June 2, 2016

Stripe rust has significantly increased in all wheat-growing areas in Nebraska. It is recommended that wheat be treated with a fungicide to protect the flag leaf. If the incidence (percentage of flag leaves diseased) or severity (percentage of the flag leaf area diseased) is less than 50%, spraying a fungicide will significantly reduce yield loss due to stripe rust.

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Inconsistent corn stand indicating possible seedling disease
Figure 1. Scout corn stands for intermittent gaps indicating missing or lost plants as well as diseased or dead plants.

Seedling Diseases Continue to Develop in Nebraska Corn June 2, 2016

Following several weeks of rainy conditions, seedling diseases are becoming more apparent in corn. See what symptoms to look for when scouting fields.

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UNL Extension Plant Pathologist Bob Harveson with his book.
UNL Extension Plant Pathologist Bob Harveson with his book.

UNL Plant Pathologist's Book Offers Tales of Scientific Discovery April 28, 2016

Does a reader need to be scientist — specifically, a plant pathologist — to appreciate a book about the history of discovering and treating plant diseases? Not if the reader appreciates history, science, and their broader lessons as conveyed through "The Bacterium of Many Colors" by Dr. Robert Harveson, UNL Plant Pathologist at the Panhandle Research and Extension Center.

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