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International Journal of Horticulture 2014, Vol.4, No.6, 24
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Table 2 Oviposition and adult emergence of adult
C. maculatus
in cowpea seeds treated with 1% oils of
A. boonei
Oils
Mean number of eggs laid
Adult emergence (%)
Leaf
13.50±1.23
a
22.22±0.85
b
Stem bark
11.00±0.91
a
0.00±0.00
a
Root
17.75±0.85
a
45.71±1.57
a
Control (SP)
62.50±3.22
b
86.70±2.41
c
Control (NSNO)
83.00±3.91
c
86.75±2.81
c
Note: Each value is a mean+standard error of four replicates; Means followed by the same letter along the column are not significantly
different (P>0.05) using New Duncan’s Multiple Range Test; Keys: PT: Petroleum alone treated; NSNO: No oil, no solvent
Table 3 Oviposition and adult emergence of adult
C. maculatus
in cowpea seeds treated with 2% oil of
A. boonei
Oils
Mean number of eggs laid
Adult emergence (%)
Leaf
11.50±1.23
a
17.14±1.66
b
Stem bark
9.75±0.85
a
0.00±0.00
a
Root
14.50±1.23
a
34.48±1.85
a
Control (SP)
60.50±3.22
b
83.33±2.97
c
Control (NSNO)
83.00±3.91
c
86.75±2.81
c
Note: Each value is a mean+standard error of four replicates; Means followed by the same letter along the column are not significantly
different (P>0.05) using New Duncan’s Multiple Range Test; Keys: PT: Petroleum alone treated; NSNO: No oil, no solvent
Table 4 Oviposition and adult emergence of adult
C. maculatus
in cowpea seeds treated with 3% oils of
A. boonei
Oils
Mean number of eggs laid
Adult emergence (%)
Leaf
10.00±0.91
a
7.69±1.25
b
Stem bark
7.75±0.85
a
0.00±0.00
a
Root
11.25±1.70
a
0.00±0.00
a
Control (SP)
60.00±4.08
b
83.33±2.41
c
Control (NSNO)
83.00±3.91
c
86.75±2.81
c
Note: Each value is a mean+standard error of four replicates; Means followed by the same letter along the column are not significantly
different (P>0.05) using New Duncan’s Multiple Range Test; Keys: PT: Petroleum alone treated; NSNO: No oil, no solvent
Table 5 Oviposition and adult emergence of adult
C. maculatus
in cowpea seeds treated with 4% oils of
A. boonei
Oils
Mean number of eggs laid
Adult emergence (%)
Leaf
8.50±1.23
a
0.00±0.00
a
Stem bark
5.50±1.23
a
0.00±0.00
a
Root
9.25±1.70
a
10.81±0.71
a
Control (SP)
60.00±4.08
b
83.33±2.41
c
Control (NSNO)
83.00±0.91
c
86.75±2.81
c
Note: Each value is a mean+standard error of four replicates; Means followed by the same letter along the column are not significantly
different (P>0.05) using New Duncan’s Multiple Range Test; Keys: PT: Petroleum alone treated; NSNO: No oil, no solvent
1.3 Phytochemicals screening of
Alstonia boonei
Table 6 presented the result of the phytochemical
screening of the petroleum ether extracts of
A. boonei
leaf, stem bark and root. The phytochemicals present in
the petroleum ether extracts of
A. boonei
leaf, stem bark
and root were identical. Flavonoids is absent in
A.
boonei
leaf and root but present in
A. boonei
stem
bark and this may be responsible for it high insecticidal
property.