CORN Newsletter: 2007-07, April 3, 2007

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C.O.R.N Newsletter 2007-07
April 3, 2007 - April 9, 2007

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Corn Planted into Wheat Fields
by Ron Hammond, Bruce Eisley


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We are receiving comments suggesting that many growers are planning on abandoning their wheat fields and planting corn into those fields this coming spring. Reasons for switching to corn include poor wheat stands and high corn prices. In these fields, growers should consider potential insect problems that might occur, depending on the cropping practices used. If wheat is tilled into the soil prior to corn planting, the potential for greater seedcorn maggot problems exist. If tilling wheat, a seed treatment would be appropriate for preventive maggot control. If growers plan on planting directly into standing wheat and then killing the wheat with a herbicide, the potential for other insect problems is high. The main insect of concern would be armyworms. The likelihood of an armyworm problem is dependent on whether the moths migrate in large numbers from southern states. But if this occurs, a large population that begins in wheat fields might move to corn following destruction of the wheat. Thus, growers who plant into standing wheat should follow the CORN newsletter on the current situation with armyworms, and plan on scouting their corn fields if the situation arises.

Growers should also be reminded that if changing to corn, they need to take into account the previous crop from 2006 ( before wheat was planted) . That crop could play a role in insect problems that might occur. Corn that is planted into wheat could have a problem with corn rootworm larval injury if 1) the field was in corn in 2006, 2) the field was in soybean in 2006 and trapping for the western corn rootworm variant had high numbers (one week of trapping with > 5 beetles/trap/day), or 3) the field was in soybean in 2006, was not trapped for the western corn rootworm variant but the field is located in an area that had high trap counts for western corn rootworm variant (see map http://entomology.osu.edu/ag/fycr/06map.htm. We would suggest that if any one of the above criteria is met then the field needs to be treated with either a granular or liquid insecticide, a high rate of a seed treatment insecticide (Cruiser 1250 or Poncho 1250) or one of the corn hybrids with the Bt corn rootworm trait be used in these fields.

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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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