Soybean cyst nematode females on soybean roots. The upper (blue-handled) pointer is indicating SCN females and the bottom pointer is indicating a nitrogen-fixing nodule. (Greg Tylka)
Links:
[1] http://www.ipm.iastate.edu/ipm/icm/2005/6-27/scn.html
[2] http://www.ipm.iastate.edu/ipm/icm/2006/7-24/scn.html
