Database Research Summaries2018 SCN Coalition: Monitoring Populations in Ohio
Research Focus
The focus of this project is to provide Ohio farmers and companies the information on where to deploy resistance as well as which management strategies against SCN are the most effective.
Objectives
- Monitor soybean cyst nematode populations in Ohio for the number of eggs/sample.
- Determine which source of resistance for SCN, Peking or PI 88788, will be most effective across Ohio.
- Evaluate additional management practices that limit the impact of soybean cyst nematode in Ohio.
Results
- We processed the samples at two locations, in the Niblack lab in Columbus and the Dorrance lab in Wooster. For the first report in July 2018 we had received 83 samples from 22 counties in total (July 1) By December we received 238 samples from 37 counties in total and all were processed and the numbers have been reported back to the person who submitted the sample. SCN Population Level (eggs/100 cc) Total fields % processed None Detected 89 37.4 Trace (40-200) 58 24.4 Low (200-2000) 58 24.4 Moderate (2000-5000) 22 9.2 High (5000 +) 11 4.6.
- Samples from objective 1 that have egg counts higher than 500 eggs/100 cc of soil will be moved into the greenhouse screen to determine the SCN type. Populations of SCN will first be increased on Williams 82. Test lines [PI548402 (Peking), PI88788, and PI437654] and positive controls (Lee74, Williams 82) will be inoculated with 2500 eggs/second stage juveniles to determine relative virulence. In the past 3 months, 30 populations were increased under greenhouse conditions.
- Several different SCN management studies are in progress. A study evaluating if Rye has any influence on SCN populations was planted again for the third year with a cover crop. Fall soil samples were collected to assess preliminary SCN population numbers and analysis is in process. Field experiments at 3 locations with high SCN populations were finally harvested to evaluate Seed treatment nematicides.
Importance
- We are currently putting into place several extension programing efforts to complement this effort but also to share with Ohio soybean farmers the situation in Ohio.
- With this educational effort we expect farmers in Ohio will have a greater awareness and want to sample their fields for numbers but also for SCN type.
For more information about this research project, please visit the National Soybean Checkoff Research Database.
Funded in part by the soybean checkoff.
