Journal of Mosquito Research 2015, Vol.5, No.13, 1-5
3
Table 2 Month wise man-landing collection of
Aedes aegypti
and
Aedes albopictus
in a garden in Kolkata during September 1986 to
August 1987
Month
Aedes aegypti
Aedes albopictus
Indoor
Outdoor
Total
Indoor
Outdoor
Total
September 1986
10 (12.96)
22 (12.86)
32 (12.90)
24 (13.11)
51 (3.87)
75 (8.65)
October
9 (11.68)
18 (10.52)
27 (10.88)
22 (12.02)
140 (21.60)
162 (18.68)
November
4 (5.19)
10 (5.85)
14 (5.64)
16 (8.74)
45 (6.94)
61 (7.03)
December
3 (3.89)
7 (4.09)
10 (4.03)
3 (1.63)
10 (1.54)
13 (1.49)
January 1987
1 (1.29)
5 (2.92)
6 (2.41)
0
0
0
February
3 (3.84)
5 (2.92)
8 (3.22)
0
0
0
March
4 (5.19)
7 (4.09)
11 (4.43)
5 (2.73)
1 (0.15)
6 (0.69)
April
2 (2.59)
3 (5.62)
11 (4.43)
0
0
0
May
5 (6.49)
12 (7.01)
17 (6.85)
2 (1.69)
43 (6.63)
45 (5.19)
June
7 (9.09)
16 (9.35)
23 (9.27)
10 (5.46)
24 (3.70)
34 (3.92)
July
17 (22.07)
35 (20.46)
52 (20.96)
45 (24.59)
219 (33.79)
264 (30.44)
August
12 (11.58)
25 (14.62)
37 (14.91)
56 (30.60)
151 (23.30)
207 (23.87)
Total
77 (100%)
171 (100%)
248 (100%)
183 (100%)
684 (100%)
867 (100%)
Table 3
Aedes
mosquitoes landed on man-bait beyond 6 a.m. to 6 p.m. at indoor and outdoor
Species
6-7
p.m.
7-8
p.m.
8-9
p.m.
9-10
p.m.
10-11
p.m.
11-12
p.m.
12-1
a.m.
1-2
a.m.
2-3
a.m.
3-4
a.m.
4-5
a.m.
5-6
a.m.
Total
Ae. aegypti
11 (4)
5 (1)
8
3
0
0
0
0
0
0
3
6 (8) 36 (13)
Ae. albopictus
17 (10) 9 (5)
9
6
1
0
0
0
0
0
5 (3) 9 (16) 56 (34)
Figure in the brackets indicate catches off outdoor baits
summer (85) and winter (74) [Z = 22.122; Z = 22.651]
but the number of this mosquito species landed in
summer was not higher (p>0.05) than that of winter
[Z= 0.7565].
3.2 Indoor and Outdoor Landing
At the day time, the man-landing propensity of
Ae.
aegypti
and
Ae. albopictus
was noted to be
significantly higher at outdoor than that at indoor ( Z
= 5.9842; Z= 17.08).
3.3 Quadrant
The number of
Ae. aegypti
collected off man-baits in
the first quadrant (98) was higher (p<0.05) than those
of second (42) (Z = 4.7329) and third quadrants (28)
(Z = 6.266) of the day. But the difference between the
number of
Ae. aegypti
in the first quadrant and that in
the fourth quadrant (80) was not (p>0.05) significant (Z
=1.3842).
The number of
Ae. albopictus
collected off man-baits
in the fourth quadrant (368) was higher (p<0.05)
than those of first (172) (Z = 8.412), second (146) (Z
= 9.789) and third quadrants (76) (Z = 13.485) of the
day.
4 Discussion
This man-landing study revealed certain interesting
features. Both
Ae. aegypti
and
Ae. albopictus
mosquitoes
were attracted to indoor and outdoor human baits
indiscriminately throughout the day. Man-landing outdoor
activity was greater than that of indoor activity in both
the species (177 Vs 77 in
Ae. aegypti
and 684 vs. 183
in
Ae. Albopictus
). But a greater percentage of
Ae.
aegypti
mosquitoes (31.05% i.e. 77 out of 248) were
attracted to the indoor human baits than that of
Ae.
albopictus
(21.11% i.e. 183 out of 867), indicating
that indoor activity of
Ae. aegypti
was more prominent
than that of
Ae. albopictus
. Though both the species of
mosquitoes were found to be attracted to human baits
throughout the day, there were distinct pick activity
hours, which for
Ae. aegypti
were from 8 a.m. – 9 a.m.
i.e. in the first quadrant of the day and for
Ae. albopictus
from 5 p.m. – 6 p.m. i.e. in the fourth or last quadrant
of the day. In both the species the landing propensity
increased in the monsoon months, with the peak in
July. Significantly greater number of
Ae. albopictus
mosquitoes than that of
Ae. aegypti
mosquitoes were
attracted to human baits both at indoor and outdoor
locations, showing that
Ae. albopictus
mosquitoes
