Agriculture Reference
In-Depth Information
Penicillium
and
Rhizopus
are the genera frequently
isolated from diseased tubers. It is thought that many of
these infections originate from the seed yam in the field
(Rees & Bancroft 2003) while in other cases gain entry
into the cortical tissues of the yam via natural openings,
cracks, punctures caused by various insect pests and nema-
todes and wounds resulting from mechanical damage and
poor handling (Thompson & Bancroft 1996). Incidence of
rots may be influenced by the nature of the storage
environment and whether tubers have been cured or treated
with biocides or lime and/or ash preparations, and varietal
differences. Development of rots by
Aspergillus niger
:
showed that
D. alata
was more resistant than
D. rotundata
and
D.esculenta
(Otusanya & Jeger 1996).
Destructive analysis of apparently sound yams has also
revealed high levels of chronic disease deep within the yam
tubers suggesting that a significant proportion of infections
may be initiated pre-harvest and may even stem from the
original planting material.
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