CORN Newsletter: 2009-17, June 9, 2009

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

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Wheat Scab Update June 8 2009: Southern States Got Hit Hard - The Value of Planting Resistant Varieties Highlighted in News Release
by Pierce Paul, Dennis Mills, Clay Sneller


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Some southern winter wheat states got hammered by head scab. Wheat in parts of Kentucky, Maryland, Arkansas, Georgia, Virginia and North Carolina flowered between late April and the first half of May, at a time when it rained consistently (http://www.wheatscab.psu.edu/riskTool_2009.html). Reports from plant pathologist and wheat breeders suggest that the damage currently ranges from moderate to extremely severe in some areas and seems to be getting worst with every new update. Check out the news release on the US Wheat and Barley Scab Initiative website for more details: (http://www.scabusa.org/pdfs/uswbsi_fhb-update_06-09.pdf).

Following are quotes from university and USDA scientists highlighting the value of planting scab resistant varieties.

Christina Cowger, North Carolina State University-based USDA-ARS small grains pathologist, “Severe scab symptoms have been observed in a number of fields of susceptible varieties, while nearby fields of moderately resistant varieties have much less severe scab… most growers did not use scab resistance as a criterion in selecting varieties…”

Don Hershman, University of Kentucky Extension Plant pathologist, “…the situation looked “ugly” in numerous fields… In those cases where fungicides were applied properly in a timely manner, fields visually seemed to be holding up well … Resistant varieties, where used, have also made a difference…”

Jose Costa, University of Maryland wheat breeder, “… high infection levels had shown up at three Eastern Shore yield trial locations ... Differences between susceptible varieties and those with at least moderate resistance were very apparent…”

Reports coming out of Nebraska and Kansas suggest that hard red winter wheat was also affected by head scab in some parts of those states. It is still about a week or two too early to tell whether Ohio and other northern soft red winter states will have a severe scab problem this year, however, early reports coming in from southern Ohio suggest that southern counties may have escaped a scab epidemic.

Very little can be done for wheat after head scab damage has occurred. However, selecting the right variety at planting can be the difference between minor and heavy losses in a severe scab year. Wheat breeding programs across the country, such as OSU/OARDC's, have made great progress developing scab resistant varieties. We now have several moderately resistant varieties with decent yield to choose from. OSU/OARDC recently released two new public wheat varieties, Malabar and Bromfield, which are moderately resistant to scab and yield better than Hopewell. Other moderately resistant varieties include Truman, Bess, Roane and other listed in our wheat performance trial report (http://oardc.osu.edu/wheattrials/default.asp?year=2008).

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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.

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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