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 Species
Mean Length
Mean Number of Aedes aegypti larvae consumed by a dragonfly larva
Total number of larvae consumed within 24 hours
Average number of larvae consumed within 1 hour
Anax indicus
2.87 ± 0.10 (2.77 – 2.97)
110.00 ± 7.14 (102.86 - 117.14)
4.58 ± 0.29 (4.29 - 4.87)
Pantala flavescens
1.55 ± 0.12 (1.43 – 1.67)
54.07 ± 5.15 (48.92 - 59.22)
2.31 ± 0.22 (2.09 - 2.53)
Gynacantha dravida
3.10 ± 0.18 (2.92 – 3.28)
49.00 ± 11.89 (37.11 - 60.89)
2.20 ± 0.49 (1.71 - 2.69)
Orthetrum sabina sabina
1.60 ± 0.18 (1.42 – 1.78)
26.87 ± 2.89 (23.98 - 29.76)
1.09 ± 0.12 (0.97 - 1.21)
Tholymis tillarga
1.57 ± 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.