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NCSRP

Founded by the North Central Soybean Research Program and funded by the Soybean Checkoff – this website provides information on soybean pests and diseases from checkoff-funded research, and from the university research and Extension programs of all 12 NCSRP partner states.

 

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Soybean Cyst Nematode - Life Cycle

 

The life cycle of SCN has three major stages: egg, juvenile, and adult female. The life cycle can be completed in 4 weeks under ideal conditions (soil temperatures at 75° F).

SCN life cycle
From: SCN Life Cycle, Iowa State University

 

SCN eggs SCN J2 SCN cysts
SCN eggs released from a cyst.
Photo credit: Terry Niblack

Eggs develop into juveniles (J1, J2).

The second stage juveniles enter the soybean root to feed and grow.
Photo credit: Purdue University

Females then lay 50-100 eggs in an egg mass on their posterior end. Finally, the female fills up with 200 or more eggs.

Eventually, the egg-filled female dies and her body wall hardens to form a tough cyst around the eggs, as shown here.
Photo credit: Terry Niblack