In Vitro Evaluation of Antimicrobial Activity of Alimentary Canal Extracts from the Red Palm Weevil, Rhynchophorus ferrugineus Olivier Larvae
Table 1
Antimicrobial activity of alimentary canal extracts from the red palm weevil larvae against different microbial species.
Exposure time (h)
Origin of extract
Growth Inhibition Zones (mm)
Mean
Gram negative bacteria
Gram positive bacteria
Yeast
Fungus
E. coli
Klebsiella sp.
E. faecalis
S. aureus
C. albicans
Penicillium sp.
24
G
11.75
10.75
13.25
10.75
13.50
15.00
12.50
F
13.00
12.75
14.75
13.50
12.50
14.75
13.54
M
10.75
11.50
11.50
13.50
12.50
12.50
12.04
H
9.75
11.25
13.75
10.50
12.25
12.75
11.71
Mean
11.31
11.56
13.31
12.06
12.69
13.75
48
G
15.75
12.00
15.25
12.25
16.75
19.25
15.21
F
18.50
13.50
16.50
13.75
14.00
22.50
16.46
M
13.50
12.50
13.75
14.50
14.00
14.50
13.79
H
12.75
11.25
12.50
11.75
13.75
14.75
12.79
Mean
15.13
12.31
14.50
13.06
14.63
17.75
72
G
18.25
13.00
16.75
13.75
17.75
23.00
17.08
F
20.75
15.00
22.25
17.00
17.75
25.50
19.71
M
16.25
14.50
17.25
16.50
15.25
17.00
16.13
H
14.00
13.00
16.00
14.25
15.50
18.75
15.25
Mean
17.31
13.88
18.06
15.38
16.56
21.06
96
G
20.00
17.25
21.25
27.50
22.25
24.50
22.13
F
25.75
23.25
38.25
33.00
23.50
28.00
28.63
M
19.00
17.25
22.50
25.00
17.25
18.50
19.92
H
19.00
19.25
23.75
20.50
18.75
20.25
20.25
Mean
20.94
19.25
26.44
26.50
20.44
22.81
G
16.44
13.25
16.63
16.06
17.56
20.44
F
19.50
16.13
22.94
19.31
16.94
22.69
M
14.88
13.94
16.25
17.38
14.75
15.63
H
13.88
13.69
16.50
14.25
15.06
16.63
Mean
Columns labeled with the same letter are not significantly different (); G: total gut, F: foregut, M: midgut, and H: hindgut; LSD value at 0.05: microbial species = 0.7156, origin of extract = 0.5843, and time = 0.5843.
