Clubroot may often be confused with nematode damage. Aboveground symptoms of both disorders are similar--wilting
or stunting of leaves. Digging up the plants and observing the roots is the only way to distinguish the
two disorders. Roots with clubroot are heavily clubbed and may appear spindle shaped. Multiple infections
of the same root cause extreme swelling and distortion. Nematodes cause distinctive galls or swellings
to form on the roots, but they are not clubbed or spindle shaped. In some cases, small white or brown
structures (bodies or eggs of some nematode species) may be seen.
Galls caused by root-knot nematodes
plants show significant root clubbing