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Relative Susceptibility and Proximate Composition of Rice Varieties by
Sitophilus oryzae
L.
32
Table 2 Weight loss and damage caused by
R. dominica
infestation on wheat seeds stored inside
E. aromatica-
treated jute bags at
different doses after 42 days of storage
Doses (ml)
After 42 days
Number of adult emerged
% IR
% weight loss
% damage severity
2
4
6
8
Deep-soaked
Solvent control
Untreated control
3.20±0.32
b
1.44±0.88
a
0.00±0.00
a
0.00±0.00
a
0.00±0.00
a
18.24±0.34
c
19.65±1.05
c
90.34±1.23
b
92.00±0.63
b
100.00±0.00
b
100.00±0.00
b
100.00±0.00
b
0.00±0.00
a
0.00±0.00
a
1.62±0.08
b
0.84±0.03
a
0.00±0.00
a
0.00±0.00
a
0.00±0.00
a
34.86±0.67
c
34.92±0.45
c
5.11±0.67
b
3.54±0.21
a
0.00±0.00
a
0.00±0.00
a
0.00±0.00
a
22.33±0.28
c
23.89±0.88
c
Note: Each value is the mean ±standard error of seven replicates. Mean followed by the same letters within the same column are not
significantly (P > 0.05) different from each other using New Duncan’s Multiple Range Test
unable to prevent the emergence of adult insect as
3.23 and 1.44 mean number of adult
R. dominica
was
observed in them respectively. However, their effect
was significantly (p<0.05) different from both the
solvent and untreated controls. Also, all the treated
jute bags significantly inhibited the emergence of the
adult beetle as reflected in Table 2. Only the 6 and 8ml
as well as deep-soaked treated jute bags were able to
achieve complete inhibition of the adult
R. dominica
but their effect was significantly (p>0.05) different
from that of 2 and 4ml dosage of
E. aromatica
treated
jute bags.
Weight loss and damage caused by R. dominica
infestation in wheat stored in jute bag treated with E.
aromatica oil after 42days and 6months of storage.
The effect of
Eugenia aromatica-
treated jute bags on
ability of
R. dominica
in causing seed weight loss and
damage is presented in Table 2
.
All the treated jute
bags have significant effect on the ability of
R.
dominica
to cause seed weight loss and damage at all
levels of dosages and their effect was significantly
(p<0.05) different from the controls. However, only
jute bags that were treated with 6 and 8ml doses of
E.
aromatic
a prevented the weight loss of the seeds as
well as the damage of the seeds after 42 days of
storage. The effect of the bags treated with 4, 6 and
8ml dose of
E. aromatica
was significantly (p<0.05)
different from others except bags that were
deep-soaked in 100ml of the oil which also prevented
the weight loss and damage of the seeds by the insect.
Moreover, only the jute bags that were deep-soaked
in 100ml of
E. aromatica
was able to prevent the
seed weight loss and damage (Table 3). The bags that
were sprinkled with
E. aromatica
at different doses
were nevertheless significantly (p<0.05) different
from the controls which had 67.23% (solvent control)
and 66.86% (untreated control) weight loss; 84.32%
(solvent control) and 84.12% (untreated control) seed
damage.
Table 3 Weight loss and damage caused by
R. dominica
infestation on wheat seeds stored inside
E. aromatica-
treated jute bags at
different doses after 6 months of storage
Doses (ml)
After 6 months
% weight loss
% damage severity
2
4
6
8
Deep-soaked
Solvent control
Untreated control
33.62±0.82
d
28.34±0.67
cd
25.73±0.53
c
16.48±0.63
b
0.00±0.00
a
67.23±1.88
e
66.86±2.33
e
41.35±2.89
c
37.32±1.54
c
27.33±2.09
b
23.45±2.45
b
0.00±0.00
a
84.32±0.88
d
84.12±1.08
d
Note: Each value is the mean ±standard error of seven replicates. Mean followed by the same letters within the same column are not
significantly (P > 0.05) different from each other using New Duncan’s Multiple Range Test