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C.O.R.N Newsletter 2008-20
     June 30, 2008 - July 8, 2008


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Soybean Aphid Update
by Ron Hammond, Andy Michel, Bruce Eisley

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We made numerous visits to soybean fields in northern Ohio last week to determine the current status of the soybean aphid. No aphids were found in any of the visited fields. Furthermore, no aphids have been found in any of the soybean rust sentinel plots. Although we did not sample every field in Ohio, we feel save in saying aphids are either non-existent or very low in Ohio at this time. Although aphids have been found in other states, their numbers have also been low for the most part. We still feel a combination of low aphid overwintering plus numerous beneficial insects are combining to keep aphids at low numbers. As always, we will keep an eye on the situation throughout July to see what happens because things could quickly change. Keep checking this CORN newsletter for further updates on the aphid.

A concern we have at this time, which might be more critical because of the current weed situation in a lot of fields, is the inclination for some growers who might want to “help” the situation by adding a “preventive” insecticide treatment in their late herbicide applications. We highly recommend NOT doing this! There are only two things that can or might happen. The first is you will waste money! The aphid densities are too low or non-existent in most fields. There is absolutely no reason to be treating them at this time, preventively or not. Second, because beneficial insects might be helping to keep aphid populations down, an insecticide treatment would only serve to kill off those beneficials, perhaps allowing the few aphids that might remain in a field to start multiplying easier in the coming weeks. We urge you to allow the beneficial insects to do their job by helping to keep soybean aphid below economic levels. Remember: IPM!

Readers can subscribe electronically to this newsletter by signing up at http://agcrops.osu.edu/services/email.html. E-mail labarge.1@osu.edu if you have problems subscribing or no longer wish to receive this newsletter.

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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