Surface
rot
- lesions
on storage roots are circular,
uniformly light to dark brown, dry and firm. Infection may start
at the stem end or at wounds obtained before, during and after
harvest.
- lesions
may slowly extend to the cortical tissue but do not usually extend
beyond the vascular ring.
- surface
of the storage root shrinks and the flesh underneath dries out.
- white
mycelium outgrowth is sometimes observed, after which the
root becomes hard and mummified.
Root
rot
-
lesions are alternating light and dark brown concentric or overlapping
rings. They spread beyond the vascular layer and may rot
the whole root.
-
in advanced stages, cavities develop inside the lesion which often
have white mould in inner surfaces.
- Surface rot usually infects only
those in storage and is not transmitted from the mother root to
the sprouts.
-
Fusarium root rot can transmitted from the mother root
to the sprouts, causing stem lesions.
