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C.O.R.N Newsletter 2009-17
     June 9, 2009 - June 15, 2009


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Hail damage may result in tied leaf whorls in corn
by Peter Thomison, Todd Mangen

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With recent reports of severe hail damage to corn in localized areas of SW Ohio, growers should not be surprised if they observe “twisted” or “tied” leaf whorls. Hail damage prior to the 6 to 7-leaf stage (about V5-6 according to the leaf collar staging system) often results in tied leaf whorls as injured plants recover and new leaves try to unroll. Corn plants usually grow out of this problem and tied whorls seldom cause major yield loss. In 1999, we evaluated effects of tied whorls and stalk bruising caused by hail damage in early June on corn performance at four on-farm sites in south central Ohio by comparing plots within the fields with major and minor hail damage. During the three- to four-week period following the hail storm, the number of plants exhibiting tied whorls decreased sharply. Plots that received major damage from hail exhibited 36 to 61% tied whorls on June 12, which decreased to 0 to 9% by July 6. Silking was delayed approximately 1 to 1.5 weeks in the plots with major damage vs. plots with minor damage. Severe stalk bruising did not increase lodging; lodging was negligible across farm sites, averaging less than 2%. Kernel moisture at harvest was generally higher in plots with major damage (in three of the four fields), and yields were lower compared to the plots with minor damage. More information on this evaluation is in the 2000 Agronomic Crops Team On-Farm Research Projects Summary available on-line at http://ohioline.osu.edu/sc179/sc179_16.html

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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.

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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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