CORN Newsletter: 2009-35, October 12, 2009

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C.O.R.N Newsletter 2009-35
October 12, 2009 - October 20, 2009

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It is Time to Sample for Soybean Cyst Nematode (SCN)
by Dennis Mills, Anne Dorrance, Nancy Taylor, Pierce Paul


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Soybean cyst nematode has become a more serious problem in Ohio because more and more fields are being planted to soybeans for multiple years and the nematode has been introduced into fields by machinery. In Ohio, in most years it is difficult to observe any symptoms on affected plants other than lower yields. When nematode populations are excessively high, or during years with drought, symptoms can include stunting and yellowing.

The best way to manage SCN is to know which fields have nematodes and how many nematodes are present. Fall is the best time to sample fields for soybean cyst nematodes. In the fall the nematodes have finished producing eggs. Sampling in the fall will give an estimation of the population level on which to base management decisions for planting next spring. Soil samples can be sent to some private labs or to The Ohio State University C. Wayne Ellett Plant and Pest Diagnostic Clinic. Fees for SCN testing will be: $15 per soil sample.

C. Wayne Ellett Plant and Pest Diagnostic Clinic
110 Kottman Hall
2021 Coffey Road
Ohio State University
Columbus, OH 43210-1087
614-292-5006
http://ppdc.osu.edu

SCN Soil Sampling Instructions:
1. Use a 1-inch diameter soil probe to collect soil samples (6-8 inches in depth)
2. Following a zig-zag pattern, collect 10-20 soil cores per 10-20 acres
3. Collect cores from areas of similar soil type and crop history
4. Dump cores from each 10 to 20 acre area into a bucket or tub and mix thoroughly
5. Place 1 pint (2 cups) of mixed soil in a soil sample bag or plastic zippered bag and label with a permanent marker
6. Store sample in cool, dark place until shipped to a lab doing SCN analysis.

At trace population levels, ranging from 40-200 eggs per 250 cc of soil, some yield loss may be detected when susceptible varieties are grown. If low populations are detected, ranging from 200-2000 eggs, it is recommended to plant a SCN resistant variety, but some yield loss may occur. Under moderate levels of 2000-5000 eggs of soil it is recommended to rotate to a non-host crop like corn, wheat or alfalfa next year and return with a cyst nematode resistant soybean variety the next time soybeans are planted in the field. When high levels of nematodes are encountered, such as 5000 or more eggs, the field should be rotated to a non-host crop for 2-3 years then the field should be re-sampled before planting a nematode resistant variety to ensure the nematode population has declined enough to successfully plant soybeans again.

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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