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Agronomy Answers

2016 Goss's Wilt Ratings and Disease Information
Traditionally a problem disease in the western Corn Belt, Goss’s wilt is now prevalent across the Corn Belt and spreading into Canada. Once corn plants are infected, yield potential can be reduced by up to 50 percent. There are no effective chemical control measures for Goss’s wilt. The best way to limit spread of the disease is by selecting hybrids with strong Goss’s wilt tolerance.

This bulletin provides information about Goss’s wilt and tolerance ratings for Mycogen® brand corn hybrid families. The ratings are the result of 2011-15 field trials conducted in Illinois, Iowa, Minnesota, Nebraska, South Dakota and Wyoming.

DISEASE INFORMATION
Goss’s wilt is caused by the bacterium Clavibacter michiganensis subsp. nebraskensis. It overwinters in infected corn residue, primarily found on or near the soil surface. Inoculumin the infected residue primarily spreads by wind and splashing rain. To a minor degree, Goss’s wilt also can survive in seed.

To infect a corn plant, the bacterium needs an entry point or wound, which is generally caused by heavy rainstorms, hail, wind, blowing sand or mechanical damage. Humid, wet weather is another risk factor because moist or wet leaves are conducive to the spread of disease. Read more
Diagnose nutrient deficiencies in young corn.
Between the V3 and V5 growth stages, corn transitions from deriving energy directly from the seed to acquiring energy from sunlight through photosynthesis. Visual appearances during these stages offer clues to overall plant health. Read more
Decode early season corn growth.
By properly identifying the various developmental stages in early season corn growth, producers can make well-informed decisions on replanting, applying herbicides, managing insects and more. Make sure to understand what to look for and how to differentiate the stages. Read more
Replant soybeans or leave current stand?
Many factors can cause stand reduction in soybeans. Replanting may be one option to consider. Read more
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