CORN Newsletter: 2009-31, September 15, 2009

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C.O.R.N Newsletter 2009-31
September 15, 2009 - September 21, 2009

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Soybean Aphids and Multi-Colored Asian Lady Beetles
by Ron Hammond, Andy Michel, Bruce Eisley


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As soybeans near maturity with many fields entering the R7 growth stage (beginning yellowing), we are finding larger than expected populations of soybean aphids in many fields. Growers should know that the aphids in yellowing fields are no longer of economic importance. These higher populations are being found throughout the state, and of special interest, we found extremely large populations in southern Ohio last week. High soybean aphid densities were found in Adams, Brown, southern Highland, Pike, and Scioto Counties. This is the first time we are aware of aphids achieving high numbers this far south in the state since their arrival in the early 2000s. We would mention that other states are also seeing large aphid numbers farther south in their states than previously observed. Again, most aphids are no longer of economic concern because the soybeans are beginning to mature. But this increase in aphids in southern Ohio will demand attention in coming years.

We also became aware of another occurrence that might become an issue within the next few weeks to a month. In parts of Ohio where we are seeing the higher aphid densities, we are also observing a significant increase in the presence of multi-colored Asian lady beetles. While of no direct concern in soybeans, these lady beetles might begin going to fruit crops, especially grapes grown for wine. In previous years with high populations of soybean aphids and lady beetles, wine producers had significant problems with the beetles. We then see these lady beetles going to people’s houses and entering homes, becoming a major hassle for homeowners in the fall. If not disposed of carefully, these beetles will give off a foul odor and stain walls when squashed. While perhaps not being a statewide concern, we do expect certain areas of Ohio to be affected, especially parts of northeast and southern Ohio.

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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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