1. Home
  2. Field guide
  3. Nematodes
  4. Soybean cyst nematode
SoybeanCystNematode GregTylka IowaStateUniversity

Soybean cyst nematode

Description: Roundworm, about 1⁄25" long. Females are usually swollen and can be seen with the naked eye. Yellow to white in color. Larvae are less than 1⁄64" long. Eggs are contained in dead females, which are brown and lemon-shaped and appear as cysts on roots.

Timing of damage: V2 to R6

Type of damage:  Plants will appear yellowed and stunted, usually in patches throughout the field.

Scouting: Dig up stunted plants and wash soil off roots by placing in a bucket of water. Check for female nematodes on roots. Then take a soil sample and send to a nematology lab.

Economic threshold:  Varies. Ask a nematology lab or local Extension office for guidelines.

Crop
Soybeans

Ask an Agronomist

The material and content contained in the Greenbook label database is for general use information only. Agworld and Greenbook do not provide any guarantee or assurance that the information obtained through this service is accurate, current or correct, and are therefore not liable for any loss resulting, directly or indirectly, from reliance upon this service. This label database does not replace the official manufacture issued label. Users of this database must read and follow the actual product label affixed to the container before use of the product.