Scott, Don

Woloshuk, Charles

English

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Purdue University Purdue e-Pubs Historical Documents of the Purdue Cooperative Extension Service Department of Agricultural Communication 10-10-1996 Cob Rot Damaged Corn Charles Woloshuk Purdue University, woloshuk@purdue.edu Don Scott Purdue University Follow this and additional works at: https://docs.lib.purdue.edu/agext Woloshuk, Charles and Scott, Don, "Cob Rot Damaged Corn" (1996). Historical Documents of the Purdue Cooperative Extension Service. Paper 1096. https://docs.lib.purdue.edu/agext/1096 For current publications, please contact the Education Store: https://mdc.itap.purdue.edu/ This document is provided for historical reference purposes only and should not be considered to be a practical reference or to contain information reflective of current understanding. For additional information, please contact the Department of Agricultural Communication at Purdue University, College of Agriculture: http://www.ag.purdue.edu/agcomm This document has been made available through Purdue e-Pubs, a service of the Purdue University Libraries. Please contact epubs@purdue.edu for additional information. Task ForceGRAIN QUALITYPurdue University is an equal opportunity/equal access institution.Fact Sheet #28October 10, 1996Purdue Universitypage 1 of 1Grain Quality Fact Sheets can be accessed on-line through:World Wide Web (Mosaic or Netscape) URL address:http://hermes.ecn.purdue.edu:8001/server/purdue/acspub.html(select) Grain QualityorAlmanac:send e-mail to: almanac@ecn.purdue.edumessage: send grain guideor   send grain catalogor   send grain factsheet#12 (for example)or   send acsonline GQ-12Cob rot damage is one of the many reasonswhy grain inspectors dock the price paid on aload of corn.  There has been a steady increaseof cob rot damage over the past few years inparts of Indiana.  Cob rot is primarily caused by apreharvest disease known as Diplodia ear rot.Diplodia ear rot occurs primarily in thewestern half of the state.  When infection occurswithin two weeks after silking, husks prematurelybecome bleached or straw colored, and entireears are white to grayish or grayish brown,shrunken, and lightweight.  Lightweight earsgenerally stand upright with the inner husksadhering tightly to each other.  Black specks(pycnidia) may be scattered on the husks, cobs,and sides of kernels.  Ears infected later in thegrowing season generally have a somewhatuniform whitish to grayish mold growth over andbetween the kernels starting at the base of theear and progressing towards the tip.  Infectedkernel tips are discolored.  Some isolates of thecausal fungus may cause vivipary (prematuregermination).Diplodia ear rot is enhanced by dry weatherprior to silking followed by wet conditions at andjust after silking.  Hybrids may differ in theirsusceptibility to Diplodia ear rot.  Ears are mostsusceptible to this disease during the first 21days after silking.  Diplodia ear rot is moresevere where corn follows corn with reduced-tillage practices.  The disease is usually notsevere with crop rotation or clean plowing of cornresidues.Cob Rot Damaged CornCharles Woloshuk, Botany and Plant PathologyDon Scott, Botany and Plant PathologyProper storage at or below 15% moistureprevents further development of this disease.Long term storage is not recommended becauseof the damage to kernel integrity and theincreased amounts of foreign matter (cob andbroken kernels) in the grain.  There are noknown mycotoxins produced by the Diplodiafungus in the United States, therefore feedingthe grain to livestock is possible, keeping in mindthat the nutrient value of the grain may havediminished.

Cob Rot Damaged Corn

https://docs.lib.purdue.edu/cgi/viewcontent.cgi?article=2092&amp;context=agext

Cob Rot Damaged Corn

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