Life Cycle of Soybean Nematodes

  1. Brown cysts are dislodged from roots and remain viable in the soil for many years.
  2. Each cyst contains about 200-400 eggs. First and second stage juveniles develop within the eggs. Some of the second stage juveniles hatch within the cyst and move into the soil when the soil temperature reaches higher than 50°F.
  3. The nematodes enter from the tip of the soybean roots and move within the root, find a feeding site and become stationary.
  4. Third and fourth molts occur within the root, females change color from white to yellow and die as brown cysts. Males migrate into the soil to fertilize the females. The life cycle takes about a month at 75°F.