Ohio

SUMMARY OF 1999 SOYBEAN CYST NEMATODE SAMPLING PROGRAM

The soybean cyst nematode (SCN) has continued to generate considerable interest and concern among the agricultural industry, University personnel and soybean producers in Ohio. A coordinated effort is underway in Ohio to address this problem. Check the Ohio State university web site for SCN information at: http://www.ag.ohio-state.edu/~ipm/scn/scn.htm

To increase grower awareness and to determine the extent of the SCN problem in Ohio, the "Take the Test, Beat the Pest" soil sampling program was continued through 1999. The sampling program was conducted in conjunction with the regional Soybean Cyst Nematode Coalition effort. Information on the Coalition can be found on the web at: http://www.scncoalition.org/

Background

The SCN sampling program in Ohio is a cooperative program funded primarily by the Ohio Soybean Council using soybean checkoff dollars. Various personnel and units within Ohio State University have been involved, including the C. Wayne Ellett Plant and Pest Diagnostic Clinic, personnel from the Department of Plant Pathology, the Integrated Pest Management Program in the Department of Entomology, and Ohio State University Extension field faculty. The program was initiated in August, 1998. Results of the 1998 sampling program can be found at: http://www.ag.ohio-state.edu/~ipm/scn/scnarc.htm

Results

In addition to the information individual soybean growers have received regarding their farm fields, the "Take the Test, Beat the Pest" soil sampling program has generated considerable new information.

In 1999, a total of 3,683 soil samples were processed for soybean cyst nematode. This was 146 more samples than were processed in 1998.

During 1999, samples were received from 61 counties in Ohio, compared to 60 in 1998. Fifty-three counties are known to be infested with soybean cyst nematode. One county, Monroe, was added to those known to be infested with SCN, bringing to seven the total number of counties added since the beginning of the sampling program in 1998. A distribution map is available on the web at: http://www.ag.ohio-state.edu/~ipm/scn/scn2.htm

Results of All Samples in 1999

Egg Count* Population Level Number of Samples % of Samples
No eggs detected None 1,646 44.7%
Less than 200 eggs detected Trace 821 22.3%
200-1,999 eggs detected Low 655 17.8%
2,000-4,999 eggs detected Moderate 261 7.1%
5,000 or more eggs detected High 297 8.0%
Not applicable
3 0.1%

*Egg count is expressed as number of eggs/200 cc soil, which is equal to about one cup of soil

During the sampling program in 1999, some samples contained unusually high numbers of eggs. There were 86 samples having 20,000 or more eggs. The highest sample was from Lucas county and contained 101,600 eggs. Other high samples were from Darke County (73,600 and 44,800), Fulton County (48,400 and 42,440), Henry County (52,800), Ottawa County (51,200), Sandusky County (81,600, 63,200, 58,400, 52,400, and 49,600), Seneca County (45,200) and Wood County (73,600, 52,400, 40,400, and 40,000). County summaries are available on the web at: http://www.ag.ohio-state.edu/~ipm/scn/scn3_9.htm

The sampling program is continuing in the spring of 2000.

For further information contact:

C. Wayne Ellett Plant and Pest Diagnostic Clinic
110 Kottman Hall
2021 Coffey Road, OSU
Columbus, OH 43210
Phone: (614) 292-5006
FAX: (614) 292-4455

E-mail: http://www.ag.ohio-state.edu/~plantdoc/cweppdc.html

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