DISEASES SOYBEAN - SOYBEAN CYST NEMATODE

Female nematodes set up feeding sites within the root and subsequently swell as they fill with eggs. The bloated white female bodies (about the size of a sand grain) extend from the root and are the “cysts” from which the disease takes its name. Cysts eventually turn brown as they age. They (see white arrows in photo) are much smaller that Rhizobium nodules (see blue arrow in photo) that also occur on soybean roots.