Research Article

Larvicidal Potential of Five Selected Dragonfly Nymphs in Sri Lanka over Aedes aegypti (Linnaeus) Larvae under Laboratory Settings

Table 1

Mean number of Aedesaegypti larvae consumed by different dragonfly species in 24 hours.

Dragonfly SpeciesMean LengthMean Number of Aedes aegypti larvae consumed by a dragonfly larva
Total number of larvae consumed within 24 hoursAverage number of larvae consumed within 1 hour

Anax indicus2.87 ± 0.10 
(2.77 – 2.97)
110.00 ± 7.14
(102.86 - 117.14)
4.58 ± 0.29
(4.29 - 4.87)
Pantala flavescens1.55 ± 0.12 
(1.43 – 1.67)
54.07 ± 5.15
(48.92 - 59.22)
2.31 ± 0.22
(2.09 - 2.53)
Gynacantha dravida3.10 ± 0.18 
(2.92 – 3.28)
49.00 ± 11.89
(37.11 - 60.89)
2.20 ± 0.49
(1.71 - 2.69)
Orthetrum sabina sabina1.60 ± 0.18 
(1.42 – 1.78)
26.87 ± 2.89
(23.98 - 29.76)
1.09 ± 0.12
(0.97 - 1.21)
Tholymis tillarga1.57 ± 0.09 
(1.48 – 1.66)
23.47 ± 2.48
(20.99 - 25.95)
0.95 ± 0.10
(0.85 - 1.05)

Note: values are Mean ± SE, range in parenthesis. Different superscript letters in a column show significant differences (p< 0.05) as suggested by General Linear Modelling followed by the Tukey’s pair wise comparison at 95% level of significance.