SOYBEAN
CYST NEMATODE
Description: The most
common symptom of soybean cyst nematode is reduced yield with no above ground
plant symptoms. Yellowing and stunting of plants is generally only detected in
fields with high populations. The cyst nematode can best be seen on roots in the
field during late July or August. Plants should be dug to keep roots intact. Gently
remove soil from around roots and examine root surfaces for very small (about
the size of a pin head) lemon?shaped, white cysts. Later in the season cysts turn
brown and are difficult to see. Soil samples should be collected in the fall after
harvest for disease management strategies.
Location: Soybean
cyst nematode has been found in all of the soybean growing counties in Ohio,
especially in the western half of the state.
Time of infection:
Soybean cyst nematodes become active as the soil warms and young soybean plants
produce root systems. The nematode is capable of several generations during
the growing season.
Management:
· Crop rotation
· Prevent introduction
· Resistant varieties
Corn,
Soybean, Wheat, and Alfalfa Field GuideBulletin 827