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Relative Susceptibility and Proximate Composition of Rice Varieties by
Sitophilus oryzae
L.
28
Table 9 Indices of susceptibility and moisture content of different varieties of rice due to
S. oryzae
infestation
Variety
Indices of susceptibility (S.I)
Moisture content
Imported
Cisadene
6.5
9.86
Caprice
6.3
9.88
Improved
ITA257/Faro 45
6.4
9.90
ITA 315/Faro 49
5.4
9.87
ITA 222/ Faro 36
5.9
9.93
Isan rice
8.4
10.03
Igbemo rice
7.5
10.21
Ofada rice
7.4
11.32
Erio rice
8.0
10.64
Ayede Ekiti rice
8.2
11.36
of the local varieties, Ofada, Igbemo, Erio and Ayede;
with indices of susceptibility 7.4, 7.5, 8.0, and 8.2
respectively.
4 Conclusions
From the results of this research, it was observed that
moisture content is a good indicator of susceptibility;
while, grain hardness and anti-nutrient composition
were not good indicators of susceptibility of rice
varieties to
S. oryzae
infestation and damage. Also
significant varietal differences exist in the
susceptibility to
S. oryzae
with the improved and
imported varieties exhibiting low susceptibility to
infestation and damage of
S. oryzae
, compared to the
locally produced varieties. The moisture content of
rice grains prepared for storage should be reduced
prior to storage in other to minimize post-harvest
losses as a result of infestation and damage by
S.
oryzae
. In lieu of the poor resistance of the locally
produced varieties determined in this study, it is
recommended that local rice varieties in Nigeria be
tested for susceptibility to determine their qualities.
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