Your Soybean Checkoff. Up 30% yield loss can occur because
plants are producing fewer pods than they should. The effect of
SCN on soybean yield is directly related to the numbers of
nematodes feeding on the root system. |Severe stunting and
yellowing due to SCN infection is visible in this field.
However, significant yield loss can occur from SCN feeding
without causing above-ground symptoms. Photo credit: Greg Tylka,
Iowa State University The above-ground symptoms of SCN range
from nonexistent to severe depending on the age and vigor of the
soybean plants, SCN numbers, soil fertility, moisture levels,
and other environmental conditions. Injury usually is more
severe in light, sandy soils, but it also occurs in heavier
soils. SCN damage is not always confined to smaller areas within
a field. When fields are infested with SCN throughout; areas of
stunted plants are not obvious. Root symptoms of SCN often go
unrecognized. Often it is difficult to recognize if roots are
stunted and have fewer nodules unless they