Disease problems in Nebraska corn
Scout fields now and frequently to monitor for development of NCLB and other diseases. In fields currently affected by NCLB, it will be important to consider this disease in the future when making hybrid selections and other management decisions, especially crop rotation, tillage, etc.
Bacterial Diseases Continue
Bacterial diseases in corn continue to be confirmed and reported in fields around the state, especially in fields where corn was wounded during recent inclement weather. In particular, Goss's bacterial wilt and blight, bacterial stalk rot and bacterial leaf streak have all been confirmed. Current moderate to warm weather conditions will continue to support spread and development of these diseases.
Affected corn may have one or more of the following symptoms:
- water-soaked lesions,
- internal decay, and
- sometimes unpleasant odor.
Systemically infected plants often will be discolored inside the stems. Other symptoms on the leaves may appear somewhat different than the classic leaf blight symptoms usually observed with Goss's wilt, such as the dark freckles near the edges of lesions. Glossy exudate may be visible on the surface of leaves and is common in plants with Goss's wilt, but may occur with some other bacterial diseases, too. Since the pathogens causing these diseases are at least somewhat common in fields, it is possible for plants to have more than one disease.
Unfortunately, there is no foliar treatment recommended for Goss's wilt or other bacterial diseases at this point. Since several diseases may appear similar, it is necessary to submit a sample(s) for diagnosis and confirmation.
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