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C.O.R.N Newsletter 2005-12
     May 9, 2005 - May 17, 2005


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Assessing Corn Seedling Emergence and Seedling Diseases
by Patrick Lipps

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Growers are encouraged to spend some time walking fields and digging seedlings to evaluate their condition before making replant decisions. Dig seeds from the seed furrows and wash them off with water. Seeds and seedlings that are brown in color, are soft and fall apart easily while digging are obviously dead or dying. Seeds and seedling roots or shoots that have a weft of white to pinkish mold growing on them are likely victims of fungal attack and will likely die. Pythium and Fusarium are common fungi that attack plants and cause these damping-off or seedling blight symptoms under wet, cool conditions. It is more difficult to diagnose disease damage on plants that also show abnormal growth caused by cold soil conditions or by crusting of the soil surface. Given a chance to emerge with warmer soil temperatures many of these plants will likely survive. It is best to check these seedlings very closely for dark brown or soft areas on seedling roots and on shoots next to the seed. These immature plant structures should be white to creamy white in appearance. Any discoloration will indicate a problem that could worsen if the soils remain cold or wet. Plants that show disease or damage will likely be slow to emerge even with warmer conditions and also show less vigor. Growers should also remember that uneven emergence and slow growth at this time of year could impact overall yield, but these effects must be weighed with the known impact of later planting on yield potential. A slight to moderate reduction in stand is a better bet than replanting in many instances, especially if you have to decide whether to replant these fields or plant fields that are not yet planted . Of course the later in the season the replanting is done the greater the risk of lost yield potential.

Readers can subscribe electronically to this newsletter by signing up at http://agcrops.osu.edu/services/email.html. E-mail labarge.1@osu.edu if you have problems subscribing or no longer wish to receive this newsletter.

C.O.R.N. is a summary of crop observations, related information, and appropriate recommendations for Ohio Crop Producers and Industry. C.O.R.N. is produced by the Ohio State University Extension Agronomy Team, State Specialists at The Ohio State University and Ohio Agricultural Research and Development Center. C.O.R.N. Questions are directed to State Specialists, Extension Associates, and Agents associated with Ohio State University Extension and the Ohio Agricultural Research and Development Center at The Ohio State University.


Information presented above and where trade names are used, they are supplied with the understanding that no discrimination is intended and no endorsement by Ohio State University Extension is implied. Although every attempt is made to produce information that is complete, timely, and accurate, the pesticide user bears responsibility of consulting the pesticide label and adhering to those directions.

All educational programs conducted by Ohio State University Extension are available to clientele on a nondiscriminatory basis without regard to race, color, creed, religion, sexual orientation, national origin, gender, age, disability or Vietnam-era veteran status.

Issued in furtherance of Cooperative Extension work, Acts of May 8 and June 30, 1914, in cooperation with the U.S. Department of Agriculture, Keith L. Smith, Director, Ohio State University Extension.

TDD # 1 (800) 589-8292 (Ohio only) or (614) 292-1868

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